TW202138241A - Bicycle rear sprocket system - Google Patents

Abstract

A bicycle rear sprocket system comprises a first sprocket-group 51 and a second sprocket-group 52. The first sprocket-group 51 and the second sprocket-group 52 are mounted to a bicycle rear hub assembly 29 in a first mounting state where a total number of the plurality of second rear sprockets 52a-52b is a first number. An axial position of the at least one first rear-sprocket 51a-51e is maintained in a second mounting state where the total number of the plurality of second rear sprockets 52a-52b is changed from the first number to a second number that is different from the first number.

Description

Bicycle rear sprocket system

The invention relates to a bicycle rear sprocket system.

Cycling is becoming an increasingly popular form of entertainment and a means of transportation. Furthermore, cycling has become a very popular competitive sport for amateurs and professionals.

Whether bicycles are used for recreation, transportation or competition, the bicycle industry is constantly improving various bicycle systems. A bicycle system that has been extensively redesigned is a bicycle rear sprocket system. The bicycle rear sprocket system is installed to a bicycle hub assembly.

According to a first aspect of the present invention, a bicycle sprocket system includes a first sprocket group and a second sprocket group. The first sprocket group includes at least one first rear sprocket. The second chain wheel group includes a plurality of second rear chain wheels.

In a first installation state in which one of the plurality of second rear sprockets is a first number, the first sprocket group and the second sprocket group are installed to a bicycle rear hub assembly .

In a second installation state in which the total number of the plurality of second rear sprockets is changed from the first number to a second number different from the first number, one of the at least one first rear sprockets is maintained Axial position.

By virtue of the bicycle rear sprocket system according to the first aspect, even if the total number of the plurality of second rear sprocket changes from the first number to the second number, the shaft of the at least one first rear sprocket is still maintained To position.

In other words, even if the number of rear sprocket wheels of a bicycle is changed, the rear bicycle sprocket system can still use a current bicycle chain and a current bicycle rear derailleur to drive a bicycle without swapping the current bicycle chain and the current bicycle rear derailleur. For another bicycle chain and another bicycle rear derailleur.

According to a second aspect of the present invention, the bicycle rear sprocket system according to the first aspect is configured such that the first sprocket group has a first hub engagement structure. The second sprocket group has a second hub engagement structure.

With the bicycle rear sprocket system according to the second aspect, even if the number of the bicycle rear sprocket changes, the bicycle rear sprocket system can still use the current bicycle chain and the current bicycle rear derailleur to drive a bicycle.

According to a third aspect of the present invention, the bicycle rear sprocket system according to the first aspect is configured such that in each of the first installation state and the second installation state, the second sprocket group is The rear hub assembly of the bicycle is arranged closer to an axial center plane of the rear hub assembly of the bicycle than the first sprocket group.

With the bicycle rear sprocket system according to the third aspect, even if the number of the bicycle rear sprocket changes, the bicycle rear sprocket system can still use the current bicycle chain and the current bicycle rear derailleur to drive the bicycle.

According to a fourth aspect of the present invention, a bicycle rear sprocket system includes a plurality of sprockets, a sprocket carrier, and at least one axial spacer. The plurality of sprocket wheels include a first sprocket, a second sprocket, a third sprocket, and a fourth sprocket.

The first sprocket has a first tooth tip diameter. In a first installation state in which the bicycle rear sprocket system is installed to a bicycle rear hub assembly, the first sprocket is the largest sprocket among the plurality of sprockets.

The second sprocket has a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket. In an axial direction with respect to a central axis of rotation of the plurality of sprockets, the second sprockets are adjacent to the first sprockets with no other sprockets in between.

The third sprocket has a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket. In the axial direction, the third sprocket is adjacent to the second sprocket without another sprocket in between.

The fourth sprocket has a fourth tooth tip diameter smaller than the third tooth tip diameter of the third sprocket. In the axial direction, the fourth sprocket is adjacent to the third sprocket without another sprocket in between. The sprocket carrier is configured to support at least the first sprocket and the second sprocket.

The at least one axial spacer is configured to bridge a replacement sprocket and the bicycle rear hub assembly in a second installation state in which the bicycle rear sprocket system sprocket carrier is mounted to the bicycle rear hub assembly An axial distance between abutting surfaces of a sprocket. The sprocket carrier is replaced by the at least one axial spacer and the replacement sprocket, so that an axial position of each remaining sprocket of the plurality of sprockets is maintained in the second installation state.

With the bicycle rear sprocket system according to the fourth aspect, even if the number of the bicycle rear sprocket is changed by replacing the sprocket carrier with the at least one axial spacer and the replacement sprocket, the bicycle rear sprocket The system can still use the current bicycle chain and the current bicycle rear derailleur to drive the bicycle without exchanging the current bicycle chain and the current bicycle rear derailleur with another bicycle chain and another bicycle rear derailleur.

According to a fifth aspect of the present invention, the bicycle rear sprocket system according to the fourth aspect is configured such that the sprocket carrier has a first hub that can be engaged with a sprocket support body of the bicycle rear hub assembly Joint contours.

The second sprocket has a second hub engagement profile that can be engaged with the sprocket support body of the bicycle rear hub assembly. The first sprocket does not have a hub engagement profile.

The first sprocket, the second sprocket, and the sprocket carrier are fixed together by a common fastener, so that the sprocket carrier is positioned on the first chain in the axial direction in the first installation state Between the wheel and the second sprocket.

With the bicycle rear sprocket system according to the fifth aspect, even if the number of the bicycle rear sprocket changes, the bicycle rear sprocket system can still use the current bicycle chain and the current bicycle rear derailleur to drive a bicycle.

According to a sixth aspect of the present invention, a bicycle rear sprocket system includes a plurality of sprockets, a first sprocket carrier, a second sprocket carrier, and at least one axial spacer. The plurality of sprocket wheels include a first sprocket, a second sprocket, a third sprocket, and a fourth sprocket.

The first sprocket has a first tooth tip diameter. In a first installation state in which the bicycle rear sprocket system is installed to a bicycle rear hub assembly, the first sprocket is the largest sprocket among the plurality of sprockets.

The second sprocket has a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket. In an axial direction with respect to a central axis of rotation of the plurality of sprockets, the second sprockets are adjacent to the first sprockets with no other sprockets in between.

The third sprocket has a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket. In the axial direction, the third sprocket is adjacent to the second sprocket without another sprocket in between.

The fourth sprocket has a fourth tooth tip diameter smaller than the third tooth tip diameter of the third sprocket. In the axial direction, the fourth sprocket is adjacent to the third sprocket without another sprocket in between.

The first sprocket carrier is configured to support at least the first sprocket. The second sprocket carrier is configured to support at least one of the second sprocket, the third sprocket, and the fourth sprocket. In the axial direction, the second sprocket carrier is adjacent to the first sprocket carrier without another sprocket carrier in between.

The at least one axial spacer is configured to bridge a replacement sprocket and the bicycle rear hub in a second installation state in which the bicycle rear sprocket system is mounted to the bicycle rear hub assembly with a first sprocket carrier An axial distance between abutting surfaces of a sprocket of the assembly. The first sprocket carrier is replaced by the at least one axial spacer and the replacement sprocket, so that an axial position of each remaining sprocket of the plurality of sprockets is maintained in the second installation state.

With the bicycle rear sprocket system according to the sixth aspect, even if the number of the bicycle rear sprocket changes in a state in which the first sprocket carrier is replaced by the at least one axial spacer and the replacement sprocket Therefore, the bicycle rear sprocket system can still use the current bicycle chain and the current bicycle rear derailleur to drive the bicycle without exchanging the current bicycle chain and the current bicycle rear derailleur with another bicycle chain and another bicycle rear derailleur.

According to a seventh aspect of the present invention, a bicycle rear sprocket system includes a plurality of sprockets and at least one axial spacer. The plurality of sprockets includes a first sprocket and a second sprocket.

The first sprocket has a first tooth tip diameter. In a first installation state in which the bicycle rear sprocket system is installed to a bicycle rear hub assembly, the first sprocket is the largest sprocket among the plurality of sprockets.

The second sprocket has a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket. In an axial direction with respect to a central axis of rotation of the plurality of sprockets, the second sprockets are adjacent to the first sprockets with no other sprockets in between.

The at least one axial spacer is configured to bridge the second sprocket and a bicycle rear hub in a second installation state in which the bicycle rear sprocket system is mounted to the bicycle rear hub assembly with a first sprocket An axial distance between abutting surfaces of a sprocket of the assembly. The first sprocket is replaced by the at least one axial spacer, so that in the second installation state, an axial position of each remaining sprocket of the plurality of sprockets is maintained.

With the bicycle rear sprocket system according to the seventh aspect, even if the number of the bicycle rear sprocket changes in a state in which the first sprocket is replaced by the at least one axial spacer, the bicycle rear sprocket The system can still use the current bicycle chain and the current bicycle rear derailleur to drive the bicycle without exchanging the current bicycle chain and the current bicycle rear derailleur with another bicycle chain and another bicycle rear derailleur.

According to an eighth aspect of the present invention, a bicycle rear sprocket system includes a plurality of sprockets, a sprocket carrier, and at least one axial spacer. The plurality of sprockets includes a first sprocket and a second sprocket.

The first sprocket has a first tooth tip diameter. In a first installation state in which the bicycle rear sprocket system is installed to a bicycle rear hub assembly, the first sprocket is the largest sprocket among the plurality of sprockets.

The second sprocket has a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket. In an axial direction with respect to a central axis of rotation of the plurality of sprockets, the second sprockets are adjacent to the first sprockets with no other sprockets in between.

The sprocket carrier is configured to support only the first sprocket. The at least one axial spacer is configured to bridge the second sprocket and the bicycle rear hub assembly in a second installation state in which the bicycle rear sprocket system sprocket carrier is mounted to the bicycle rear hub assembly An axial distance between abutting surfaces of a sprocket. The sprocket carrier is replaced by the at least one axial spacer, so that in the second installation state, an axial position of each remaining sprocket of the plurality of sprocket wheels is maintained.

With the bicycle rear sprocket system according to the eighth aspect, even if the number of the bicycle rear sprocket changes in a state in which the sprocket carrier is replaced by the at least one axial spacer, the bicycle rear sprocket system It is still possible to use the current bicycle chain and the current bicycle rear derailleur to drive the bicycle without exchanging the current bicycle chain and the current bicycle rear derailleur with another bicycle chain and another bicycle rear derailleur.

According to a ninth aspect of the present invention, a bicycle rear sprocket system includes a plurality of sprockets, a sprocket carrier, and at least one axial spacer. The plurality of sprocket wheels include a first sprocket, a second sprocket, a third sprocket, and a fourth sprocket.

The first sprocket has a first tooth tip diameter. In a first installation state in which the bicycle rear sprocket system is installed to a bicycle rear hub assembly, the first sprocket is the largest sprocket among the plurality of sprockets.

The second sprocket has a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket. In an axial direction with respect to a central axis of rotation of the plurality of sprockets, the second sprockets are adjacent to the first sprockets with no other sprockets in between.

The third sprocket has a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket. In the axial direction, the third sprocket is adjacent to the second sprocket without another sprocket in between.

The fourth sprocket has a fourth tooth tip diameter smaller than the third tooth tip diameter of the third sprocket. In the axial direction, the fourth sprocket is adjacent to the third sprocket without another sprocket in between.

The sprocket carrier is configured to support at least the second sprocket. The at least one axial spacer is configured to bridge the sprocket carrier and a bicycle rear hub in a second installation state in which the bicycle rear sprocket system is mounted to the bicycle rear hub assembly with the first sprocket An axial distance between abutting surfaces of a sprocket of the assembly. The first sprocket is replaced by the at least one axial spacer, so that in the second installation state, an axial position of each remaining sprocket of the plurality of sprockets is maintained.

With the bicycle rear sprocket system according to the ninth aspect, even if the number of the bicycle rear sprocket changes in a state in which the first sprocket is replaced by the at least one axial spacer, the bicycle rear sprocket The system can still use the current bicycle chain and the current bicycle rear derailleur to drive the bicycle without exchanging the current bicycle chain and the current bicycle rear derailleur with another bicycle chain and another bicycle rear derailleur.

According to a tenth aspect of the present invention, the bicycle rear sprocket system according to any one of the fourth to ninth aspects is configured such that the at least one axial spacer includes a metal part and a non-metal part.

The metal part is configured to abut the sprocket abutment surface of the bicycle rear hub assembly. The non-metal part is configured to be disposed on an opposite side of the sprocket abutment surface of the bicycle rear hub assembly with respect to the metal part in the second installation state.

With the bicycle rear sprocket system according to the tenth aspect, the bicycle rear sprocket system can ensure that the axial spacer has sufficient rigidity because the axial spacer includes the metal part. In addition, weight saving of the axial spacer can be achieved because the axial spacer includes the non-metal part.

According to an eleventh aspect of the present invention, the bicycle rear sprocket system according to any one of the fourth to tenth aspects is configured such that the bicycle rear sprocket system is not mounted to the bicycle rear hub assembly In a pre-installed state, the plurality of sprockets and the at least one axial spacer are fixed relative to each other into a unit by a common fastener.

With the bicycle rear sprocket system according to the eleventh aspect, the plurality of sprockets and the at least one axial spacer can be easily carried in the pre-installed state.

According to a twelfth aspect of the present invention, a bicycle rear sprocket system includes a plurality of sprockets. The plurality of sprockets includes a first sprocket and a second sprocket.

The first sprocket has a first tooth tip diameter. In a first installation state in which the bicycle rear sprocket system is installed to a bicycle rear hub assembly, the first sprocket is the largest sprocket among the plurality of sprockets.

The second sprocket has a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket. In an axial direction with respect to a central axis of rotation of the plurality of sprockets, the second sprockets are adjacent to the first sprockets with no other sprockets in between.

The first sprocket is supported by the second sprocket. In a second installation state where the bicycle rear sprocket system is installed to the bicycle rear hub assembly with the first sprocket and the second sprocket, the first sprocket and the second sprocket can be replaced by a Sprocket replacement. The first sprocket and the second sprocket are replaced by the replacement sprocket, so that in the second installation state, an axial position of each remaining sprocket of the plurality of sprocket wheels is maintained.

With the bicycle rear sprocket system according to the twelfth aspect, even if the number of the bicycle rear sprocket changes in one of the state in which the first sprocket and the second sprocket are replaced by the replacement sprocket, the The bicycle rear sprocket system can still use the current bicycle chain and the current bicycle rear derailleur to drive the bicycle without exchanging the current bicycle chain and the current bicycle rear derailleur with another bicycle chain and another bicycle rear derailleur.

According to a thirteenth aspect of the present invention, a bicycle rear sprocket system includes a plurality of sprockets and a sprocket carrier. The plurality of sprockets includes a first sprocket, a second sprocket and a third sprocket.

The first sprocket has a first tooth tip diameter. In a first installation state in which the bicycle rear sprocket system is installed to a bicycle rear hub assembly, the first sprocket is the largest sprocket among the plurality of sprockets.

The second sprocket has a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket. In an axial direction with respect to a central axis of rotation of the plurality of sprockets, the second sprockets are adjacent to the first sprockets with no other sprockets in between.

The third sprocket has a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket. In the axial direction, the third sprocket is adjacent to the second sprocket without another sprocket in between.

The sprocket carrier is configured to support only the first sprocket and the second sprocket. The sprocket carrier can be replaced with an alternative sprocket carrier. In a second installation state in which the bicycle rear sprocket system is installed to the bicycle rear hub assembly with the sprocket carrier, the replacement sprocket carrier only supports a replacement sprocket. The sprocket carrier is replaced by the replacement sprocket carrier, so that an axial position of each remaining sprocket of the plurality of sprocket wheels is maintained in the second installation state.

With the bicycle rear sprocket system according to the thirteenth aspect, even if the number of the bicycle rear sprocket changes in a state in which the sprocket carrier is replaced by the replacement sprocket carrier, the bicycle rear sprocket system still The current bicycle chain and the current bicycle rear derailleur can be used to drive the bicycle without exchanging the current bicycle chain and the current bicycle rear derailleur with another bicycle chain and another bicycle rear derailleur.

According to a fourteenth aspect of the present invention, a bicycle rear sprocket system includes a plurality of sprockets and a sprocket carrier. The plurality of sprockets includes a first sprocket, a second sprocket and a third sprocket.

The first sprocket has a first tooth tip diameter. In a first installation state in which the bicycle rear sprocket system is installed to a bicycle rear hub assembly, the first sprocket is the largest sprocket among the plurality of sprockets.

The second sprocket has a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket. In an axial direction with respect to a central axis of rotation of the plurality of sprockets, the second sprockets are adjacent to the first sprockets with no other sprockets in between.

The third sprocket has a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket. In the axial direction, the third sprocket is adjacent to the second sprocket without another sprocket in between.

The sprocket carrier is configured to support the second sprocket and the third sprocket. The first sprocket is supported by the second sprocket. The first sprocket, the second sprocket, the third sprocket and the sprocket carrier can be replaced with an alternative sprocket carrier. In a second installation state where the bicycle rear sprocket system is installed to the bicycle rear hub assembly with the sprocket carrier, the replacement sprocket carrier only supports a replacement sprocket and a further replacement sprocket. The sprocket carrier is replaced by the replacement sprocket carrier, so that an axial position of each remaining sprocket of the plurality of sprocket wheels is maintained in the second installation state.

With the bicycle rear sprocket system according to the fourteenth aspect, even if the number of the bicycle rear sprocket changes in a state in which the sprocket carrier is replaced by the replacement sprocket carrier, the bicycle rear sprocket system still The current bicycle chain and the current bicycle rear derailleur can be used to drive the bicycle without exchanging the current bicycle chain and the current bicycle rear derailleur with another bicycle chain and another bicycle rear derailleur.

Selected embodiments of the technology of the present invention will now be explained with reference to the drawings. Those who are familiar with the technology will understand from the present invention: the following description of the embodiments of the present technology is provided for illustration only and not for limiting the present technology as defined by the scope of the appended invention application and its equivalents.

In the following embodiments, if a plurality of components and parts correspond to each other, the same symbols are used to indicate the corresponding parts and corresponding parts. The first embodiment

＜General configuration of bicycle＞

As shown in FIG. 1, the bicycle 1 includes a bicycle chain 9, a frame 11, a handle 13, front wheels 17 and rear wheels 19, a shift device 24, a transmission system 25 and a front fork 20.

The front fork 20 is rotatably attached to the frame 11. The handle 13 is fixed to the front fork 20. The front wheel 17 is rotatably attached to the front fork 20. The rear wheel 19 can be rotatably attached to a rear part of the frame 11 via a bicycle rear hub assembly 29. A front tire 17a is attached to the front wheel 17. A rear tire 19a is attached to the rear wheel 19.

The shift device 24 is attached to the handle 13. The shift device 24 operates a bicycle rear derailleur 26 via a control cable. The bicycle rear derailleur 26 is attached to one of the rear parts of the frame 11, for example.

The bicycle rear derailleur 26 moves the bicycle chain 9 from one bicycle rear sprocket of a bicycle rear sprocket assembly 28 to another bicycle rear sprocket of the bicycle rear sprocket assembly 28 through the gear shifting device 24. A simplified description of one of Figure 1 shows the rear sprocket of a bicycle.

The transmission system 25 mainly includes a crank assembly 27 and a bicycle rear sprocket assembly 28. Specifically, the transmission system 25 mainly includes a crank assembly 27, a bicycle rear wheel hub assembly 29, and a bicycle rear sprocket assembly 28. The bicycle chain 9 may also belong to the transmission system 25.

The crank assembly 27 is rotatably supported on a lower part of the frame 11. The crank assembly 27 includes at least one bicycle front sprocket 35. In this embodiment, the crank assembly 27 includes a bicycle front sprocket 35 engaged with the bicycle chain 9.

The rear wheel hub assembly 29 of the bicycle is installed on the rear part of the frame 11. The bicycle rear wheel hub assembly 29 rotatably supports the bicycle rear sprocket assembly 28.

The bicycle rear sprocket assembly 28 is mounted to the bicycle rear hub assembly 29 by a locking member 30. The locking member 30 is coupled to the bicycle rear hub assembly 29 such that the bicycle rear sprocket assembly 28 is prohibited from moving axially relative to the bicycle rear hub assembly 29.

The bicycle rear sprocket assembly 28 is included in a bicycle rear sprocket system 50. The bicycle rear sprocket system 50 includes a bicycle rear sprocket assembly 28. The configuration of the bicycle rear sprocket system 50 is described below.

As shown in FIG. 2, the bicycle rear wheel hub assembly 29 includes a sprocket support body 29a and a sprocket abutment surface 29b. The sprocket supporting body is substantially formed in a tubular shape. For example, the sprocket supporting body 29a is a free wheel. A sprocket engagement profile 29c that engages with a hub engagement profile is formed on an outer peripheral surface of the sprocket support body 29a. The hub engagement profile is described below.

The sprocket abutment surface 29b is provided on the sprocket supporting body 29a. One of the largest sprocket or a sprocket carrier in the bicycle rear sprocket assembly 28 is adjacent to the sprocket abutment surface 29b. The following describes the largest sprocket and sprocket carrier.

＜Bicycle rear sprocket system＞

As shown in FIG. 2, the bicycle rear sprocket system 50 may be rotatably supported by the bicycle rear hub assembly 29. The bicycle rear sprocket system 50 has a rotation center axis C1. The bicycle rear sprocket system 50 is configured to be mounted to the bicycle rear hub assembly 29 for rotation relative to the central axis of rotation C1. The rotation center axis C1 is coaxial with a hub axis of the bicycle rear wheel hub assembly 29.

As shown in FIGS. 3A and 3B, the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29 in a first installation state and a second installation state. The bicycle rear sprocket system 50 includes a first sprocket group 51 and a second sprocket group 52. In each of the first installation state and the second installation state, the second sprocket group 52 is placed on the bicycle rear hub assembly 29 closer to the one axis of the bicycle rear hub assembly 29 than the first sprocket group 51 To the center plane CL.

The first sprocket group 51 includes at least one first rear sprocket. In this embodiment, the first sprocket group 51 includes a plurality of first rear sprocket 51a, 51b, 51c, 51d, 51e.

The first sprocket group 51 has a first hub engaging structure 53. The first hub engagement structure 53 is engaged with the sprocket engagement contour 29c of the bicycle rear hub assembly 29. The first hub engagement structure 53 includes hub engagement contours respectively formed on the first rear sprockets 51a, 51b, 51c, 51d, and 51e. The hub engagement profile is described below.

The second sprocket group 52 includes a plurality of second rear sprockets 52a and 52b. In this embodiment, the second sprocket group 52 further includes a sprocket carrier 52c. The sprocket carrier 52c supports the second rear sprockets 52a, 52b in the first mounting state.

The second sprocket group 52 may further include an alternative axial spacer 52d. The alternative axial spacer 52d is configured to be placed between the second rear sprocket 52b and the sprocket abutment surface 29b in the second installation state.

The second sprocket group 52 has a second hub engagement structure 54. The second hub engagement structure 54 is engaged with the sprocket engagement contour 29c of the bicycle rear hub assembly 29. The second hub engagement structure 54 includes hub engagement contours respectively formed on the first rear sprockets 51a, 51b, 51c, 51d, and 51e. The hub engagement profile is described below.

As shown in FIG. 3A, in the first installation state in which one of the plurality of second rear sprockets 52a, 52b is a first number in total, the first sprocket group 51 and the second sprocket group 52 are Install to the rear wheel hub assembly 29 of the bicycle. The total number of the second rear sprockets 52a, 52b is the first number in the first installation state. In the embodiment shown in FIG. 3A, the first number is two.

As shown in FIG. 3B, in the second installation state in which the total number of the plurality of second rear sprockets 52a, 52b is changed from the first number to a second number different from the first number, at least one first rear sprocket is maintained One of the axial positions of the sprockets 51a, 51b, 51c, 51d, 51e. The total number of the second rear sprocket 52b is the second number in the second installation state. In the embodiment shown in FIG. 3B, the second number is one.

In this embodiment, in the second installation state, by placing the replacement axial spacer 52d and a replacement second rear sprocket 52b' on the bicycle rear hub assembly 29 instead of supporting the second rear as shown in FIG. 3A The sprocket carrier 52c of the sprocket wheels 52a and 52b maintains the axial position of at least one first rear sprocket 51a, 51b, 51c, 51d, 51e. In this embodiment, the alternative axial spacer 52d includes an alternative axial spacer. Alternatively, the substitute axial spacer 52d may include a plurality of substitute axial spacers. In this embodiment, the second rear sprocket 52a does not have a hub engagement profile. In other words, the second rear sprocket 52a is not directly engaged with a sprocket support body 29a of the bicycle rear hub assembly 29.

For example, in the second to ninth embodiments described below, the first number and second number of second sprocket groups 52 are configured as follows.

4A, 4B, 5A, 5B, 6A, 6B, 10A, 10B, 11A, 11B of the second to third embodiments and the seventh to eighth embodiments described below It is shown that the total number of one of the second sprocket groups 52 is two in the first installation state. The total number of the second sprocket group 52 is one in the second installation state. In this case, the total number of the second sprocket group 52 is changed from two to one. In other words, the first number is two and the second number is one.

As shown in FIGS. 7A, 7B, 8A, 8B, 9A, 9B, 9C, and 9D of the fourth to sixth embodiments described below, the total number of the second sprocket group 52 is in the first One in the installation status. The total number of the second sprocket group 52 is zero in the second installation state. In this case, the total number of the second sprocket group 52 changes from one to zero. In other words, the first number is one and the second number is zero.

As shown in FIGS. 12A and 12B of the ninth embodiment described below, the total number of the second sprocket group 52 in the first installation state is three. The total number of the second sprocket group 52 is two in the second installation state. In this case, the total number of the second sprocket group 52 changes from three to two. In other words, the first number is three and the second number is two.

In the bicycle rear sprocket system 50 including the above configuration, suppose the second sprocket group 52 in the first installation state (see FIG. 3A) is exchanged for the second sprocket group 52 in the second installation state (see FIG. 3B) The group 52 maintains the axial position of the first sprocket group 51.

In this way, even if the number of second rear sprockets 52a, 52b is changed, the bicycle rear sprocket system 50 can still use a current bicycle chain 9 and a current bicycle rear derailleur 26 to drive the bicycle 1, without changing the current bicycle chain 9 and current The bicycle rear derailleur 26 is exchanged for another bicycle chain and another bicycle rear derailleur. Second embodiment

The configuration of the bicycle 1 of the second embodiment is substantially the same as that of the first embodiment. In the second embodiment, the explanation of the configuration of the bicycle 1 is omitted.

＜Bicycle rear sprocket system＞

As shown in FIGS. 4A and 4B, the bicycle rear sprocket system 50 includes a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, a sprocket carrier 71, and at least one replacement axial spacer 75 . The at least one replacement axial spacer 75 is an example of one of the axial spacers in Technical Solution 4. The bicycle rear sprocket system 50 further includes a plurality of axial spacers 81a, 81b, 81c, 81d, 81e. The bicycle rear sprocket system 50 further includes an alternative rear sprocket 85.

In other words, the bicycle rear sprocket system 50 includes a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, a sprocket carrier 71, a plurality of axial spacers 81a, 81b, 81c, 81d, 81e, replacement The rear sprocket 85 and at least one replacement axial spacer 75.

The bicycle rear sprocket system 50 is held on the bicycle rear hub assembly 29 by the locking member 30. The bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29 in the first installation state or the second installation state.

FIG. 4A indicates the bicycle rear sprocket system 50 in the first installation state. FIG. 4B indicates the bicycle rear sprocket system 50 in the second installation state.

As shown in FIG. 4A, the plurality of rear sprockets 61, 62, 63, 64 include a first rear sprocket 61, a second rear sprocket 62, a third rear sprocket 63, and a fourth rear sprocket 65. The first rear sprocket 61 is an example of one of the first sprocket in the technical solution 4. The second rear sprocket 62 is an example of a second sprocket in the technical solution 4. The third rear sprocket 63 is an example of a third sprocket in technical solution 4. The fourth rear sprocket 65 is an example of one of the fourth sprocket in technical solution 4. The plurality of rear sprocket wheels 65, 66, and 67 further include a fifth rear sprocket 65, a sixth rear sprocket 66 and a seventh rear sprocket 67.

The first rear sprocket 61 has a first tooth tip diameter. In the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the first rear sprocket 61 is one of a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67 One largest sprocket.

The first rear sprocket 61 does not have a hub engagement profile. In other words, the first rear sprocket 61 is not directly engaged with one of the sprocket support bodies 29a of the bicycle rear hub assembly 29.

The second rear sprocket 62 has a second tooth tip diameter which is smaller than the first tooth tip diameter of the first rear sprocket 61. In an axial direction with respect to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, the second rear sprocket 62 is adjacent to the first rear sprocket 61 and is located thereon There is no other sprocket in between.

The second rear sprocket 62 has a second hub engagement profile 62a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The second hub engagement profile 62 a is provided on an inner peripheral surface of the second rear sprocket 62.

The third rear sprocket 63 has a third tooth tip diameter which is smaller than the second tooth tip diameter of the second rear sprocket 62. In the axial direction, the third rear sprocket 63 is adjacent to the second rear sprocket 62 without another sprocket in between.

The third rear sprocket 63 has a third hub engagement profile 63a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The third hub engagement profile 63a is provided on an inner peripheral surface of the third rear sprocket 63.

The fourth rear sprocket 64 has a fourth tooth tip diameter which is smaller than the third tooth tip diameter of the third rear sprocket 63. In the axial direction, the fourth rear sprocket 64 is adjacent to the third rear sprocket 63 without another sprocket in between.

The fourth rear sprocket 64 has a fourth hub engagement profile 64a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The fourth hub engagement profile 64 a is provided on an inner peripheral surface of one of the fourth rear sprocket 64.

The fifth rear sprocket 65 has a fifth tooth tip diameter which is smaller than the fourth tooth tip diameter of the fourth rear sprocket 64. In the axial direction, the fifth rear sprocket 65 is adjacent to the fourth rear sprocket 64 without another sprocket in between.

The fifth rear sprocket 65 has a fifth hub engagement profile 65a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The fifth hub engagement profile 65a is provided on the inner peripheral surface of one of the fifth rear sprockets 65.

The sixth rear sprocket 66 has a sixth tooth tip diameter which is smaller than the fifth tooth tip diameter of the fifth rear sprocket 65. In the axial direction, the sixth rear sprocket 66 is adjacent to the fifth rear sprocket 65 without another sprocket in between.

The sixth rear sprocket 66 has a sixth hub engagement profile 66a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The sixth hub engagement profile 66a is provided on the inner peripheral surface of one of the sixth rear sprockets 66.

The seventh rear sprocket 67 has a seventh tooth tip diameter which is smaller than the sixth tooth tip diameter of the sixth rear sprocket 66. In the axial direction, the seventh rear sprocket 67 is adjacent to the sixth rear sprocket 66 without another sprocket in between.

The seventh rear sprocket 67 has a seventh hub engagement profile 67a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The seventh hub engagement profile 67a is provided on the inner peripheral surface of one of the seventh rear sprockets 67.

As shown in FIG. 4A, the sprocket carrier 71 is configured to support at least the first rear sprocket 61 and the second rear sprocket 62. Specifically, in the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the sprocket carrier 71 is configured to support at least the first rear sprocket 61 and the second rear sprocket 62 .

The sprocket carrier 71 has a first hub engagement profile 71a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The first hub engagement profile 71 a is provided on an inner peripheral surface of one of the sprocket carriers 71.

For example, the sprocket carrier 71 is disposed between the first rear sprocket 61 and the second rear sprocket 62 in the axial direction. In this embodiment, the sprocket carrier 71 supports the first rear sprocket 61 and the second rear sprocket 62. Specifically, in this embodiment, the sprocket carrier 71 supports the first rear sprocket 61 and the second rear sprocket 62 via a common fastener 69.

In other words, the first rear sprocket 61, the second rear sprocket 62 and the sprocket carrier 71 are fixed together by the common fastener 69, so that the sprocket carrier 71 is positioned in the first axial direction in the first installation state. Between the rear sprocket 61 and the second rear sprocket 62.

As shown in Figure 4A, a plurality of axial spacers 81a, 81b, 81c, 81d, 81e are configured to bridge an axial distance between adjacent sprockets. For example, the plurality of axial spacers include first to fifth axial spacers 81a, 81b, 81c, 81d, 81e.

The first axial spacer 81a is disposed between the second rear sprocket 62 and the third rear sprocket 63 in the axial direction. The second axial spacer 81b is disposed between the third rear sprocket 63 and the fourth rear sprocket 64 in the axial direction. The third axial spacer 81c is disposed between the fourth rear sprocket 64 and the fifth rear sprocket 65 in the axial direction.

The fourth axial spacer 81d is disposed between the fifth rear sprocket 65 and the sixth rear sprocket 66 in the axial direction. The fifth axial spacer 81e is disposed between the sixth rear sprocket 66 and the seventh rear sprocket 67 in the axial direction.

As shown in FIGS. 4A and 4B, the sprocket carrier 71 is replaced by at least one replacement axial spacer 75 and a replacement rear sprocket 85, so that a plurality of rear sprocket 61, 62, 63, An axial position of each remaining sprocket of 64, 65, 66, 67.

For example, at least one alternative axial spacer 75 is an alternative axial spacer. The remaining sprockets of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67 are each of the third to seventh rear sprockets 63, 64, 65, 66, 67.

The replacement rear sprocket 85 serves as the second rear sprocket 62 in the second installation state. The replacement rear sprocket 85 is disposed at the same axial position as the second rear sprocket 62 in the second installation state. Specifically, the replacement rear sprocket 85 is disposed at the same axial position as the second rear sprocket 62 via at least one replacement axial spacer in the second installation state. In this embodiment, the replacement rear sprocket 85 functions as a largest rear sprocket in the second installation state.

The replacement rear sprocket 85 has a hub engagement profile 85a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 85 a of the replacement rear sprocket 85 is provided on an inner peripheral surface of the replacement rear sprocket 85.

In the second installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, at least one replacement axial spacer 75 is configured to bridge one of the replacement rear sprocket 85 and the bicycle rear hub assembly 29 An axial distance between the abutment surfaces 29b of the sprocket, wherein the sprocket carrier 71 is replaced by at least one replacement axial spacer 75 and a replacement rear sprocket 85, so that the plurality of rear sprocket 61, An axial position of each remaining sprocket of 62, 63, 64, 65, 66, 67.

For example, in this embodiment, at least one alternative axial spacer 75 includes one alternative axial spacer. Alternatively, the at least one alternative axial spacer 75 may include a plurality of alternative axial spacers. In the second installation state, the replacement axial spacer 75 is disposed between the replacement rear sprocket 85 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29. The thickness of the substitute axial spacer 75 is set so that the substitute rear sprocket 85 is disposed at the same axial position as the second rear sprocket 62.

Thereby, the replacement rear sprocket 85 and the third to seventh rear sprockets 63, 64, 65, 66, 67 in the second installation state are respectively arranged with the second to seventh rear sprockets in the first installation state 62, 63, 64, 65, 66, 67 at the same axial position. The third embodiment

The configuration of the bicycle 1 of the third embodiment is substantially the same as that of the first embodiment. In the third embodiment, the explanation of the configuration of the bicycle 1 is omitted.

＜Bicycle rear sprocket system＞

As shown in FIGS. 5A and 5B, the bicycle rear sprocket system 50 includes a plurality of rear sprocket wheels 61, 62, 63, 64, 65, 66, 67, a first sprocket carrier 71, and a second sprocket carrier 72 and at least one replacement axial spacer 75. The at least one replacement axial spacer 75 is an example of one of the axial spacers in the technical solution 6. The bicycle rear sprocket system 50 further includes a plurality of axial spacers 81a, 81b, 81c, 81d. The bicycle rear sprocket system 50 further includes an alternative rear sprocket 85.

In other words, the bicycle rear sprocket system 50 includes a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, a first sprocket carrier 71, a second sprocket carrier 72, a plurality of axial spacers 81a, 81b, 81c, 81d, replacement rear sprocket 85, and at least one replacement axial spacer 75.

The bicycle rear sprocket system 50 is held on the bicycle rear hub assembly 29 by the locking member 30. The bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29 in a first installation state or a second installation state.

FIG. 5A indicates the bicycle rear sprocket system 50 in the first installation state. FIG. 5B indicates the bicycle rear sprocket system 50 in the second installation state.

As shown in FIG. 5A, the plurality of rear sprocket wheels include a first rear sprocket 61, a second rear sprocket 62, a third rear sprocket 63 and a fourth rear sprocket 64. The first rear sprocket 61 is an example of the first sprocket in the technical solution 6. The second rear sprocket 62 is an example of a second sprocket in the technical solution 6. The third rear sprocket 63 is an example of a third sprocket in the technical solution 6. The fourth rear sprocket 64 is an example of one of the fourth sprocket in technical solution 6. The plurality of rear sprockets further include a fifth rear sprocket 65, a sixth rear sprocket 66, and a seventh rear sprocket 67.

The first rear sprocket 61 has a first tooth tip diameter. In the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the first rear sprocket 61 is one of a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67 One largest sprocket.

The first rear sprocket 61 does not have a hub engagement profile. In other words, the first rear sprocket 61 is not directly engaged with the sprocket support body 29a of the bicycle rear hub assembly 29.

The second rear sprocket 62 has a second tooth tip diameter which is smaller than the first tooth tip diameter of the first rear sprocket 61. In the axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, the second rear sprocket 62 is adjacent to the first rear sprocket 61 and is located therebetween. There is no other sprocket in between.

The second rear sprocket 62 does not have a hub engagement profile. In other words, the second rear sprocket 62 does not directly engage with the sprocket support body 29a of the bicycle rear hub assembly 29.

The third rear sprocket 63 has a third tooth tip diameter which is smaller than the second tooth tip diameter of the second rear sprocket 62. In the axial direction, the third rear sprocket 63 is adjacent to the second rear sprocket 62 without another sprocket in between.

The third rear sprocket 63 does not have a hub engagement profile. In other words, the third rear sprocket 63 is not directly engaged with the sprocket support body 29a of the bicycle rear hub assembly 29.

The fourth rear sprocket 64 has a fourth tooth tip diameter which is smaller than the third tooth tip diameter of the third rear sprocket 63. In the axial direction, the fourth rear sprocket 64 is adjacent to the third rear sprocket 63 without another sprocket in between.

The fourth rear sprocket 64 does not have a hub engagement profile. In other words, the fourth rear sprocket 64 is not directly engaged with the sprocket support body 29a of the bicycle rear hub assembly 29.

The fifth rear sprocket 65 has a fifth tooth tip diameter which is smaller than the fourth tooth tip diameter of the fourth rear sprocket 64. In the axial direction, the fifth rear sprocket 65 is adjacent to the fourth rear sprocket 64 without another sprocket in between.

The fifth rear sprocket 65 has a hub engagement profile 65a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 65 a of the fifth rear sprocket 65 is disposed on an inner peripheral surface of the fifth rear sprocket 65.

The sixth rear sprocket 66 has a sixth tooth tip diameter which is smaller than the fifth tooth tip diameter of the fifth rear sprocket 65. In the axial direction, the sixth rear sprocket 66 is adjacent to the fifth rear sprocket 65 without another sprocket in between.

The sixth rear sprocket 66 has a hub engagement profile 66a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 66 a of the sixth rear sprocket 66 is disposed on an inner peripheral surface of the sixth rear sprocket 66.

The seventh rear sprocket 67 has a seventh tooth tip diameter which is smaller than the sixth tooth tip diameter of the sixth rear sprocket 66. In the axial direction, the seventh rear sprocket 67 is adjacent to the sixth rear sprocket 66 without another sprocket in between.

The seventh rear sprocket 67 has a hub engagement profile 67a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 67a of the seventh rear sprocket 67 is provided on an inner peripheral surface of the seventh rear sprocket 67.

As shown in FIG. 5A, the first sprocket carrier 71 is configured to support at least the first rear sprocket 61. Specifically, in the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the first sprocket carrier 71 is configured to support at least the first rear sprocket 61.

For example, the first sprocket carrier 71 is disposed between the first rear sprocket 61 and the second rear sprocket 62 in the axial direction in the first installation state. In the first installation state, the first sprocket carrier 71 supports the first rear sprocket 61 and the second rear sprocket 62. Specifically, in this embodiment, in the first installation state, the first sprocket carrier 71 supports the first rear sprocket 61 and the second rear sprocket 62 via a common fastener 69.

In other words, the first rear sprocket 61, the second rear sprocket 62, and the first sprocket carrier 71 are fixed together by the common fastener 69, so that the first sprocket carrier 71 is in the axial direction in the first installation state. Located between the first rear sprocket 61 and the second rear sprocket 62.

The first sprocket carrier 71 has a hub engagement profile 71a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 71 a of the first sprocket carrier 71 is disposed on an inner peripheral surface of the first sprocket carrier 71.

As shown in FIG. 5B, the first sprocket carrier 71 is replaced by at least one replacement axial spacer 75 and a replacement rear sprocket 85, so that a plurality of rear sprocket 61, 62, 63, 64 are maintained in the second installation state , 65, 66, 67 of each remaining sprocket axial position.

For example, in this embodiment, at least one replacement axial spacer 75 is a replacement axial spacer 75. Alternatively, the at least one alternative axial spacer 75 may include a plurality of alternative axial spacers. The remaining sprockets of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67 are each of the third to seventh rear sprockets 63, 64, 65, 66, 67. In this embodiment, the replacement rear sprocket 85 functions as a largest rear sprocket in the second installation state.

The second sprocket carrier 72 is configured to support at least one of the second rear sprocket 62, the third rear sprocket 63 and the fourth rear sprocket 64. Specifically, in the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the second sprocket carrier 72 is configured to support the second rear sprocket 62 and the third rear sprocket At least one of 63 and the fourth rear sprocket 64.

As shown in FIG. 5A, in the axial direction, the second sprocket carrier 72 is adjacent to the first sprocket carrier 71 without another sprocket carrier in between. For example, the second sprocket carrier 72 is disposed between the third rear sprocket 63 and the fourth rear sprocket 64 in the axial direction. The second sprocket carrier 72 supports the third rear sprocket 63 and the fourth rear sprocket 64. Specifically, in this embodiment, the second sprocket carrier 72 supports the third rear sprocket 63 and the fourth rear sprocket 64 via a common fastener 70.

In other words, the third rear sprocket 63, the fourth rear sprocket 64, and the second sprocket carrier 72 are fixed together by the common fastener 70, so that the second sprocket carrier 72 is positioned on the third rear chain in the axial direction. Between the wheel 63 and the fourth rear sprocket 64.

The second sprocket carrier 72 has a hub engagement profile 72a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement contour 72 a of the second sprocket carrier 72 is disposed on an inner peripheral surface of the second sprocket carrier 72.

As shown in FIG. 5A, a plurality of axial spacers are configured to bridge one of the first to seventh rear sprockets 67 and the first and second sprocket carriers 71, 72 between two adjacent parts Axial spacing. For example, the plurality of axial spacers include first to fourth axial spacers 81a, 81b, 81c, 81d.

The first axial spacer 81 a is disposed between the first sprocket carrier 71 and the second sprocket carrier 72. The second axial spacer 81 b is disposed between the second sprocket carrier 72 and the fifth rear sprocket 65. The third axial spacer 81c is disposed between the fifth rear sprocket 65 and the sixth rear sprocket 66. The fourth axial spacer 81 d is disposed between the sixth rear sprocket 66 and the seventh rear sprocket 67.

As shown in FIG. 5B, in the second installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, at least one replacement axial spacer 75 is configured to bridge the replacement rear sprocket 85 and the bicycle An axial distance between the sprocket abutting surfaces 29b of the rear wheel hub assembly 29, wherein the first sprocket carrier 71 is replaced by at least one replacement axial spacer 75 and a replacement sprocket 85, so that it is maintained in the second installation state An axial position of each remaining sprocket of the plurality of sprockets 61, 62, 63, 64, 65, 66, 67.

For example, at least one alternative axial spacer 75 includes one alternative axial spacer. Alternatively, the at least one alternative axial spacer 75 may include a plurality of alternative axial spacers. In the second installation state, the replacement axial spacer 75 is disposed between the replacement rear sprocket 85 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29 in the axial direction. The thickness of the substitute axial spacer 75 is set so that the substitute rear sprocket 85 is disposed at the same axial position as the second rear sprocket 62.

Thereby, the replacement rear sprocket 85 and the third to seventh rear sprockets 63, 64, 65, 66, 67 in the second installation state are respectively arranged with the second to seventh rear sprockets in the first installation state 62, 63, 64, 65, 66, 67 at the same axial position.

<Variations of the second embodiment>

As a variant of the second embodiment, the bicycle rear sprocket system 50 may be configured as follows.

(1) In the second embodiment, the explanation of the bicycle rear sprocket system 50 is performed as an example of using the first sprocket carrier 71 and the second sprocket carrier 72.

The bicycle rear sprocket system 50 can be configured as follows. As shown in FIGS. 6A and 6B, the bicycle rear sprocket system 50 may include a third sprocket carrier 73. The third sprocket carrier 73 is configured to support the fourth rear sprocket 64 and the fifth rear sprocket 65.

In this embodiment, as shown in FIG. 6A, the fifth rear sprocket 65, the sixth rear sprocket 66, and the third sprocket carrier 73 are fixed together by a common fastener 68, so that the third sprocket carrier 73 is positioned between the fifth rear sprocket 65 and the sixth rear sprocket 66 in the axial direction.

As shown in FIG. 6B, the first sprocket carrier 71 is replaced by at least one replacement axial spacer 75 and a replacement rear sprocket 85. Specifically, the first sprocket carrier 71 is replaced by the replacement axial spacers 75 and 76 and the replacement rear sprocket 85. In this embodiment, each of the substitute axial spacers 75 and 76 is a substitute axial spacer 75. Alternatively, each of the alternative axial spacers 75, 76 may include a plurality of alternative axial spacers. In this embodiment, the replacement rear sprocket 85 functions as a largest rear sprocket in the second installation state. Fourth embodiment

The configuration of the bicycle 1 of the fourth embodiment is substantially the same as that of the first embodiment. In the fourth embodiment, the explanation of the configuration of the bicycle 1 is omitted.

＜Bicycle rear sprocket system＞

As shown in FIGS. 7A and 7B, the bicycle rear sprocket system 50 includes a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67 and at least one replacement axial spacer 75. The at least one replacement axial spacer 75 is an example of one of the axial spacers in the seventh solution. The bicycle rear sprocket system 50 further includes a plurality of axial spacers 81a, 81b, 81c, 81d, 81e, 81f.

The bicycle rear sprocket system 50 is held on the bicycle rear hub assembly 29 by the locking member 30. The bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29 in a first installation state or a second installation state.

FIG. 7A indicates the bicycle rear sprocket system 50 in the first installation state. FIG. 7B indicates the bicycle rear sprocket system 50 in the second installation state.

As shown in FIG. 7A, the plurality of rear sprockets includes a first rear sprocket 61 and a second rear sprocket 62. The first rear sprocket 61 is an example of the first sprocket in the technical solution 7. The second rear sprocket 62 is an example of one of the first sprocket in technical solution 7. The plurality of rear sprocket wheels further include a third rear sprocket 63, a fourth rear sprocket 64, a fifth rear sprocket 65, a sixth rear sprocket 66, and a seventh rear sprocket 67.

The first rear sprocket 61 has a first tooth tip diameter. In the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the first rear sprocket 61 is one of a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67 One largest sprocket.

The first rear sprocket 61 has a hub engagement profile 61a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 61 a of the first rear sprocket 61 is disposed on an inner peripheral surface of the first rear sprocket 61.

The second rear sprocket 62 has a second tooth tip diameter which is smaller than the first tooth tip diameter of the first rear sprocket 61. In the axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, the second rear sprocket 62 is adjacent to the first rear sprocket 61 and is located therebetween. There is no other sprocket in between.

The second rear sprocket 62 has a hub engagement profile 62a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 62 a of the second rear sprocket 62 is disposed on an inner peripheral surface of the second rear sprocket 62.

The third rear sprocket 63 has a third tooth tip diameter which is smaller than the second tooth tip diameter of the second rear sprocket 62. In the axial direction with respect to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, the third rear sprocket 63 is adjacent to the second rear sprocket 62 and is located therebetween. There is no other sprocket in between.

The third rear sprocket 63 has a hub engagement profile 63a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 63 a of the third rear sprocket 63 is disposed on an inner peripheral surface of the third rear sprocket 63.

The fourth rear sprocket 64 has a fourth tooth tip diameter which is smaller than the third tooth tip diameter of the third rear sprocket 63. In the axial direction with respect to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, the fourth rear sprocket 64 is adjacent to the third rear sprocket 63 and is located therebetween. There is no other sprocket in between.

The fourth rear sprocket 64 has a hub engagement profile 64a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 64 a of the fourth rear sprocket 64 is disposed on an inner peripheral surface of the fourth rear sprocket 64.

The fifth rear sprocket 65 has a fifth tooth tip diameter which is smaller than the fourth tooth tip diameter of the fourth rear sprocket 64. In the axial direction, the fifth rear sprocket 65 is adjacent to the fourth rear sprocket 64 without another sprocket in between.

The fifth rear sprocket 65 has a hub engagement profile 65a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 65 a of the fifth rear sprocket 65 is disposed on an inner peripheral surface of the fifth rear sprocket 65.

The sixth rear sprocket 66 has a sixth tooth tip diameter which is smaller than the fifth tooth tip diameter of the fifth rear sprocket 65. In the axial direction, the sixth rear sprocket 66 is adjacent to the fifth rear sprocket 65 without another sprocket in between.

The sixth rear sprocket 66 has a hub engagement profile 66a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 66 a of the sixth rear sprocket 66 is disposed on an inner peripheral surface of the sixth rear sprocket 66.

The seventh rear sprocket 67 has a seventh tooth tip diameter which is smaller than the sixth tooth tip diameter of the sixth rear sprocket 66. In the axial direction, the seventh rear sprocket 67 is adjacent to the sixth rear sprocket 66 without another sprocket in between.

The seventh rear sprocket 67 has a hub engagement profile 67a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 67a of the seventh rear sprocket 67 is provided on an inner peripheral surface of the seventh rear sprocket 67.

As shown in FIG. 7A, a plurality of axial spacers 81a, 81b, 81c, 81d, 81e, 81f are configured to bridge the first to seventh rear sprockets 61, 62, 63, 64, 65, 66, 67 An axial distance between two adjacent parts. For example, the plurality of axial spacers include first to sixth axial spacers 81a, 81b, 81c, 81d, 81e, 81f.

The first axial spacer 81 a is disposed between the first rear sprocket 61 and the second rear sprocket 62. The second axial spacer 81b is disposed between the second rear sprocket 62 and the third rear sprocket 63. The third axial spacer 81c is disposed between the third rear sprocket 63 and the fourth rear sprocket 64.

The fourth axial spacer 81 d is disposed between the fourth rear sprocket 64 and the fifth rear sprocket 65. The fifth axial spacer 81e is disposed between the fifth rear sprocket 65 and the sixth rear sprocket 66. The sixth axial spacer 81 f is disposed between the sixth rear sprocket 66 and the seventh rear sprocket 67.

As shown in FIG. 7B, in the second installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, at least one alternative axial spacer 75 is configured to bridge the second rear sprocket 62 and An axial distance between the sprocket abutting surfaces 29b of the bicycle rear wheel hub assembly 29, where the first rear sprocket 61 is replaced by at least one replacement axial spacer 75, so that the plurality of sprockets are maintained in the second installation state An axial position of each remaining sprocket of 61, 62, 63, 64, 65, 66, 67.

The first rear sprocket 61 is replaced by at least one replacement axial spacer 75, so that one of the remaining sprocket of the plurality of rear sprocket 61, 62, 63, 64, 65, 66, 67 is maintained in the second installation state Axial position. The remaining sprocket wheels of the plurality of rear sprocket wheels are each of the second to seventh rear sprocket wheels 62, 63, 64, 65, 66, 67. In this embodiment, the second rear sprocket 62 functions as a largest rear sprocket in the second installation state.

For example, at least one alternative axial spacer 75 includes one alternative axial spacer. Alternatively, the at least one alternative axial spacer 75 may include a plurality of alternative axial spacers. In the second installation state, the replacement axial spacer 75 is disposed between the second rear sprocket 62 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29. The thickness of the substitute axial spacer 75 is set so that the second rear sprocket 62 in the second installation state is placed at the same axial position as the second rear sprocket 62 in the first installation state.

Thereby, the second to seventh rear sprockets 62, 63, 64, 65, 66, and 67 in the second installation state are respectively arranged with the second to seventh rear sprockets 62, 63, and 67 in the first installation state. 64, 65, 66, 67 at the same axial position. Fifth embodiment

The configuration of the bicycle 1 of the fifth embodiment is substantially the same as that of the first embodiment. In the fifth embodiment, the explanation of the configuration of the bicycle 1 is omitted.

＜Bicycle rear sprocket system＞

As shown in FIGS. 8A and 8B, the bicycle rear sprocket system 50 includes a plurality of rear sprockets 61, 62, 63, 64, 65, 66, a sprocket carrier 71 and at least one replacement axial spacer 75. The at least one replacement axial spacer 75 is an example of one of the axial spacers in the technical solution 8. The bicycle rear sprocket system 50 further includes a plurality of axial spacers 81a, 81b, 81c, 81d, 81e.

The bicycle rear sprocket system 50 is held on the bicycle rear hub assembly 29 by the locking member 30. The bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29 in a first installation state or a second installation state.

FIG. 8A indicates the bicycle rear sprocket system 50 in the first installation state. FIG. 8B indicates the bicycle rear sprocket system 50 in the second installation state.

As shown in FIG. 8A, the plurality of rear sprockets includes a first rear sprocket 61 and a second rear sprocket 62. The first rear sprocket 61 is an example of one of the first sprocket in the technical solution 8. The second rear sprocket 62 is an example of one of the first sprocket in the technical solution 8. The plurality of rear sprocket wheels further include a third rear sprocket 63, a fourth rear sprocket 64, a fifth rear sprocket 65, and a sixth rear sprocket 66.

The first rear sprocket 61 has a first tooth tip diameter. In the first installation state where the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the first rear sprocket 61 is the largest of the plurality of rear sprockets 61, 62, 63, 64, 65, 66 Sprocket.

The first rear sprocket 61 does not have a hub engagement profile. In other words, the first rear sprocket 61 is not directly engaged with the sprocket support body 29a of the bicycle rear hub assembly 29.

The second rear sprocket 62 has a second tooth tip diameter which is smaller than the first tooth tip diameter of the first rear sprocket 61. In the axial direction with respect to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, the second rear sprocket 62 is adjacent to the first rear sprocket 61 and between them There is no other sprocket.

The second rear sprocket 62 has a hub engagement profile 62a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 62 a of the second rear sprocket 62 is disposed on an inner peripheral surface of the second rear sprocket 62.

The third rear sprocket 63 has a third tooth tip diameter which is smaller than the second tooth tip diameter of the second rear sprocket 62. In the axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, the third rear sprocket 63 is adjacent to and between the second rear sprocket 62 There is no other sprocket.

The third rear sprocket 63 has a hub engagement profile 63a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 63 a of the third rear sprocket 63 is disposed on an inner peripheral surface of the third rear sprocket 63.

The fourth rear sprocket 64 has a fourth tooth tip diameter which is smaller than the third tooth tip diameter of the third rear sprocket 63. In the axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, the fourth rear sprocket 64 is adjacent to and between the third rear sprocket 63 There is no other sprocket.

The fourth rear sprocket 64 has a hub engagement profile 64a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 64 a of the fourth rear sprocket 64 is disposed on an inner peripheral surface of the fourth rear sprocket 64.

The fifth rear sprocket 65 has a fifth tooth tip diameter which is smaller than the fourth tooth tip diameter of the fourth rear sprocket 64. In the axial direction, the fifth rear sprocket 65 is adjacent to the fourth rear sprocket 64 without another sprocket in between.

The fifth rear sprocket 65 has a hub engagement profile 65a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 65 a of the fifth rear sprocket 65 is disposed on an inner peripheral surface of the fifth rear sprocket 65.

The sixth rear sprocket 66 has a sixth tooth tip diameter which is smaller than the fifth tooth tip diameter of the fifth rear sprocket 65. In the axial direction, the sixth rear sprocket 66 is adjacent to the fifth rear sprocket 65 without another sprocket in between.

The sixth rear sprocket 66 has a hub engagement profile 66a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 66 a of the sixth rear sprocket 66 is disposed on an inner peripheral surface of the sixth rear sprocket 66.

As shown in FIG. 8A, a plurality of axial spacers 81a, 81b, 81c, 81d, 81e are configured to bridge the first to sixth rear sprockets 61, 62, 63, 64, 65, 66 and the sprocket carrier An axial distance between two adjacent parts in 71. For example, the plurality of axial spacers include first to fifth axial spacers 81a, 81b, 81c, 81d, 81e.

The first axial spacer 81 a is disposed between the sprocket carrier 71 and the second rear sprocket 62. The second axial spacer 81b is disposed between the second rear sprocket 62 and the third rear sprocket 63. The third axial spacer 81c is disposed between the third rear sprocket 63 and the fourth rear sprocket 64.

The fourth axial spacer 81 d is disposed between the fourth rear sprocket 64 and the fifth rear sprocket 65. The fifth axial spacer 81e is disposed between the fifth rear sprocket 65 and the sixth rear sprocket 66.

As shown in FIG. 8A, the sprocket carrier 71 is configured to support only the first rear sprocket 61. Specifically, in the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the sprocket carrier 71 is configured to support only the first rear sprocket 61.

The sprocket carrier 71 has a hub engagement profile 71a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement contour 71 a of the sprocket carrier 71 is disposed on an inner peripheral surface of the sprocket carrier 71.

For example, in the first installation state, the sprocket carrier 71 is disposed between the first rear sprocket 61 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29. The sprocket carrier 71 supports only the first rear sprocket 61. Specifically, the sprocket carrier 71 only supports the first rear sprocket 61 via a fastener 69.

In other words, the first rear sprocket 61 and the sprocket carrier 71 are fixed together by the fastener 69, so that the sprocket carrier 71 is positioned on the first rear sprocket 61 and the bicycle rear hub in the axial direction in the first installation state. The sprocket of the assembly 29 abuts between the surfaces 29b.

As shown in FIG. 8B, in the second installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, at least one alternative axial spacer 75 is configured to bridge the second rear sprocket 62 and An axial distance between the sprocket abutting surfaces 29b of the bicycle rear wheel hub assembly 29, wherein the sprocket carrier 71 is replaced by at least one replacement axial spacer 75, so that the plurality of sprocket 61, An axial position of each remaining sprocket of 62, 63, 64, 65, 66, 67.

The sprocket carrier 71 is replaced by at least one replacement axial spacer 75, so that one of the remaining sprockets of the plurality of rear sprockets 61, 62, 63, 64, 65, 66 is maintained in the second installation state. The remaining sprockets of the plurality of rear sprockets 61, 62, 63, 64, 65, and 66 are each of the second to sixth rear sprockets 62, 63, 64, 65, and 66. Specifically, the sprocket carrier 71 and the first axial spacer 81 a are replaced by at least one replacement axial spacer 75. In this embodiment, the second rear sprocket 62 functions as a largest rear sprocket in the second installation state.

For example, at least one alternative axial spacer 75 includes one alternative axial spacer 75. Alternatively, the at least one alternative axial spacer 75 may include a plurality of alternative axial spacers. In the second installation state, the replacement axial spacer 75 is disposed between the second rear sprocket 62 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29. The thickness of the substitute axial spacer 75 is set so that the second rear sprocket 62 in the second installation state is placed at the same axial position as the second rear sprocket 62 in the first installation state.

Thereby, the second to sixth rear sprockets 62, 63, 64, 65, and 66 in the second installation state are respectively arranged with the second to sixth rear sprockets 62, 63, 64, and in the first installation state. 65 and 66 are at the same axial position. Sixth embodiment

The configuration of the bicycle 1 of the sixth embodiment is substantially the same as that of the first embodiment. In the sixth embodiment, the explanation of the configuration of the bicycle 1 is omitted.

＜Bicycle rear sprocket system＞

As shown in FIGS. 9A and 9B, the bicycle rear sprocket system 50 includes a plurality of rear sprockets 61, 62, 63, 64, 65, 66, a sprocket carrier 71 and at least one replacement axial spacer 75. The at least one replacement axial spacer 75 is an example of one of the axial spacers in Technical Solution 9. The bicycle rear sprocket system 50 further includes a plurality of axial spacers 81a, 81b, 81c, 81d, 81e.

The bicycle rear sprocket system 50 is held on the bicycle rear hub assembly 29 by the locking member 30. The bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29 in a first installation state or a second installation state.

FIG. 9A indicates the bicycle rear sprocket system 50 in the first installation state. FIG. 9B indicates the bicycle rear sprocket system 50 in the second installation state.

As shown in FIG. 9A, the plurality of rear sprockets includes a first rear sprocket 61, a second rear sprocket 62, a third rear sprocket 63 and a fourth rear sprocket 64. The first rear sprocket 61 is an example of one of the first sprocket in the technical solution 9. The second rear sprocket 62 is an example of one of the second sprocket in technical solution 9. The third rear sprocket 63 is an example of a third sprocket in technical solution 9. The fourth rear sprocket 64 is an example of one of the fourth sprocket in technical solution 9. The plurality of rear sprocket wheels further include a fifth rear sprocket 65 and a sixth rear sprocket 66.

The first rear sprocket 61 has a first tooth tip diameter. In the first installation state where the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the first rear sprocket 61 is the largest of the plurality of rear sprockets 61, 62, 63, 64, 65, 66 Sprocket.

The first rear sprocket 61 has a hub engagement profile 61a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile of the first rear sprocket 61 is arranged on an inner peripheral surface of the first rear sprocket 61.

The second rear sprocket 62 has a second tooth tip diameter which is smaller than the first tooth tip diameter of the first rear sprocket 61. In the axial direction with respect to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, the second rear sprocket 62 is adjacent to the first rear sprocket 61 and between them There is no other sprocket.

The second rear sprocket 62 does not have a hub engagement profile. In other words, the second rear sprocket 62 does not directly engage with the sprocket support body 29a of the bicycle rear hub assembly 29.

The third rear sprocket 63 has a third tooth tip diameter which is smaller than the second tooth tip diameter of the second rear sprocket 62. In the axial direction, the third rear sprocket 63 is adjacent to the second rear sprocket 62 without another sprocket in between.

The third rear sprocket 63 does not have a hub engagement profile. In other words, the third rear sprocket 63 is not directly engaged with the sprocket support body 29a of the bicycle rear hub assembly 29.

The fourth rear sprocket 64 has a fourth tooth tip diameter which is smaller than the third tooth tip diameter of the third rear sprocket 63. In the axial direction, the fourth rear sprocket 64 is adjacent to the third rear sprocket 63 without another sprocket in between.

The fourth rear sprocket 64 has a hub engagement profile 64a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 64 a of the fourth rear sprocket 64 is disposed on an inner peripheral surface of the fourth rear sprocket 64.

The fifth rear sprocket 65 has a fifth tooth tip diameter which is smaller than the fourth tooth tip diameter of the fourth rear sprocket 64. In the axial direction, the fifth rear sprocket 65 is adjacent to the fourth rear sprocket 64 without another sprocket in between.

The fifth rear sprocket 65 has a hub engagement profile 65a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 65 a of the fifth rear sprocket 65 is disposed on an inner peripheral surface of the fifth rear sprocket 65.

The sixth rear sprocket 66 has a sixth tooth tip diameter which is smaller than the fifth tooth tip diameter of the fifth rear sprocket 65. In the axial direction, the sixth rear sprocket 66 is adjacent to the fifth rear sprocket 65 without another sprocket in between.

The sixth rear sprocket 66 has a hub engagement profile 66a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 66 a of the sixth rear sprocket 66 is disposed on an inner peripheral surface of the sixth rear sprocket 66.

As shown in FIG. 9A, a plurality of axial spacers 81a, 81b, 81c, 81d, 81e are configured to bridge the first rear sprocket 61, the sprocket carrier 71, and the fourth to sixth rear sprocket 64, 65 , 66 and an axial distance between two adjacent parts of the sprocket abutting surface 29b of the bicycle rear wheel hub assembly 29. For example, the plurality of axial spacers include first to fifth axial spacers 81a, 81b, 81c, 81d, 81e.

The first axial spacer 81 a is disposed between the first rear sprocket 61 and the sprocket abutting surface 29 b of the bicycle rear hub assembly 29. The second axial spacer 81b is disposed between the first rear sprocket 61 and the sprocket carrier 71. The third axial spacer 81 c is disposed between the sprocket carrier 71 and the fourth rear sprocket 64.

The fourth axial spacer 81 d is disposed between the fourth rear sprocket 64 and the fifth rear sprocket 65. The fifth axial spacer 81e is disposed between the fifth rear sprocket 65 and the sixth rear sprocket 66.

As shown in FIG. 9A, the sprocket carrier 71 is configured to support at least the second rear sprocket 62. Specifically, in the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the sprocket carrier 71 is configured to support the second rear sprocket 62 and the third rear sprocket 63.

The sprocket carrier 71 has a hub engagement profile 71a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement contour 71 a of the sprocket carrier 71 is disposed on an inner peripheral surface of the sprocket carrier 71.

For example, the sprocket carrier 71 is disposed between the second rear sprocket 62 and the third rear sprocket 63. The sprocket carrier 71 supports the second rear sprocket 62 and the third rear sprocket 63 via a common fastener 70.

In other words, the second rear sprocket 62, the third rear sprocket 63 and the sprocket carrier 71 are fixed together by the common fastener 70, so that the sprocket carrier 71 is positioned on the second rear sprocket 62 and the second rear sprocket 62 and the first sprocket in the axial direction. Between the three rear sprockets 63.

The sprocket carrier 71 has a hub engagement profile that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile of the sprocket carrier 71 is arranged on an inner peripheral surface of the sprocket carrier 71.

For example, the sprocket carrier 71 is placed between the second rear sprocket 62 and the third rear sprocket 63 in the first installation state. The sprocket carrier 71 supports the second rear sprocket 62 and the third rear sprocket 63. Specifically, the sprocket carrier 71 supports the second rear sprocket 62 and the third rear sprocket 63 via a common fastener 70.

In other words, the second rear sprocket 62, the third rear sprocket 63, and the sprocket carrier 71 are fixed together by the common fastener 70, so that the sprocket carrier 71 is positioned in the second axial direction in the first installation state. Between the rear sprocket 62 and the third rear sprocket 63.

As shown in FIG. 9B, in the second installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, at least one alternative axial spacer 75 is configured to bridge the sprocket carrier 71 and the bicycle rear An axial distance between the sprocket abutment surfaces 29b of the hub assembly 29, wherein the first rear sprocket 61 is replaced by at least one replacement axial spacer 75, so that the plurality of sprocket 61, An axial position of each remaining sprocket of 62, 63, 64, 65, 66.

The first rear sprocket 61 is replaced by at least one replacement axial spacer 75, so that one of the remaining sprockets of the plurality of rear sprocket 61, 62, 63, 64, 65, 66 is maintained in the second installation state. Location. The remaining sprockets of the plurality of rear sprockets 61, 62, 63, 64, 65, and 66 are each of the second to sixth rear sprockets 62, 63, 64, 65, and 66.

Specifically, the first rear sprocket 61, the first axial spacer 81a, and the second axial spacer 81b are replaced by at least one replacement axial spacer 75, so that the plurality of rear sprockets are maintained in the second installation state One of the axial positions of each remaining sprocket of 61, 62, 63, 64, 65, 66. In this embodiment, the second rear sprocket 62 functions as a largest rear sprocket in the second installation state.

For example, at least one alternative axial spacer 75 includes one alternative axial spacer 75. Alternatively, the at least one alternative axial spacer 75 may include a plurality of alternative axial spacers. In the second installation state, the replacement axial spacer 75 is disposed between the sprocket carrier 71 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29. The thickness of the substitute axial spacer 75 is set so that the sprocket carrier 71 in the second installation state is placed at the same axial position as the sprocket carrier 71 in the first installation state.

Thereby, the second to sixth rear sprockets 62, 63, 64, 65, and 66 in the second installation state are respectively arranged with the second to sixth rear sprockets 62, 63, 64, and in the first installation state. 65 and 66 are at the same axial position.

<Variations of the seventh embodiment>

As a variation of the sixth embodiment, the bicycle rear sprocket system 50 may be configured as follows.

(1) In the sixth embodiment, the explanation of the bicycle rear sprocket system 50 is implemented as the first axial spacer 81a is disposed on the first rear sprocket 61 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29 An instance between.

The bicycle rear sprocket system 50 can be configured as follows. As shown in FIGS. 9C and 9D, the first rear sprocket 61 may abut the sprocket abutment surface 29b of the bicycle rear hub assembly 29 without the first axial spacer 81a. Even with this configuration, as shown in FIGS. 9C and 9D, the second to sixth rear sprockets 62, 63, 64, 65, and 66 in the second installation state are respectively arranged with the first installation state in the first installation state. The second to sixth rear sprockets 62, 63, 64, 65, 66 are at the same axial position. Seventh embodiment

The configuration of the bicycle 1 of the seventh embodiment is substantially the same as that of the first embodiment. In the seventh embodiment, the explanation of the configuration of the bicycle 1 is omitted.

＜Bicycle rear sprocket system＞

As shown in FIGS. 10A and 10B, the bicycle rear sprocket system 50 includes a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68. The bicycle rear sprocket system 50 further includes a plurality of axial spacers 81a, 81b, 81c, 81d, 81e, 81f. The bicycle rear sprocket system 50 further includes an alternative rear sprocket 85.

The bicycle rear sprocket system 50 is held on the bicycle rear hub assembly 29 by the locking member 30. The bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29 in a first installation state or a second installation state.

FIG. 10A indicates the bicycle rear sprocket system 50 in the first installation state. FIG. 10B indicates the bicycle rear sprocket system 50 in the second installation state.

As shown in FIG. 10A, the plurality of rear sprockets includes a first rear sprocket 61 and a second rear sprocket 62. The first rear sprocket 61 is an example of one of the first sprocket in the technical solution 12. The second rear sprocket 62 is an example of a second sprocket in the technical solution 12. The plurality of rear sprockets further include a third rear sprocket 63, a fourth rear sprocket 64, a fifth rear sprocket 65, a sixth rear sprocket 66, a seventh rear sprocket 67, and an eighth rear chain Round 68.

The first rear sprocket 61 has a first tooth tip diameter. In the first installation state where the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the first rear sprocket 61 is a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68 One of the largest sprocket.

The first rear sprocket 61 does not have a hub engagement profile. In other words, the first rear sprocket 61 is not directly engaged with the sprocket support body 29a of the bicycle rear hub assembly 29.

The first rear sprocket 61 is supported by the second rear sprocket 62. For example, the first rear sprocket 61 is supported by the second rear sprocket 62 via a fastener 69. In other words, the first rear sprocket 61 and the second rear sprocket 62 are fixed together by the fastener 69.

The second rear sprocket 62 has a second tooth tip diameter which is smaller than the first tooth tip diameter of the first rear sprocket 61. In the axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68, the second rear sprocket 62 is located adjacent to the first rear sprocket 61 There is no other sprocket between them.

The second rear sprocket 62 has a hub engagement profile 62a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 62 a of the second rear sprocket 62 is disposed on an inner peripheral surface of the second rear sprocket 62.

The third rear sprocket 63 has a third tooth tip diameter which is smaller than the second tooth tip diameter of the second rear sprocket 62. In the axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68, the third rear sprocket 63 is located adjacent to the second rear sprocket 62 There is no other sprocket between them.

The third rear sprocket 63 has a hub engagement profile 63a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 63 a of the third rear sprocket 63 is disposed on an inner peripheral surface of the third rear sprocket 63.

The fourth rear sprocket 64 has a fourth tooth tip diameter which is smaller than the third tooth tip diameter of the third rear sprocket 63. In the axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68, the fourth rear sprocket 64 is adjacent to the third rear sprocket 63 and is positioned at There is no other sprocket between them.

The fourth rear sprocket 64 has a hub engagement profile 64a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 64 a of the fourth rear sprocket 64 is disposed on an inner peripheral surface of the fourth rear sprocket 64.

The fifth rear sprocket 65 has a fifth tooth tip diameter which is smaller than the fourth tooth tip diameter of the fourth rear sprocket 64. In the axial direction, the fifth rear sprocket 65 is adjacent to the fourth rear sprocket 64 without another sprocket in between.

The fifth rear sprocket 65 has a hub engagement profile 65a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 65 a of the fifth rear sprocket 65 is disposed on an inner peripheral surface of the fifth rear sprocket 65.

The sixth rear sprocket 66 has a sixth tooth tip diameter which is smaller than the fifth tooth tip diameter of the fifth rear sprocket 65. In the axial direction, the sixth rear sprocket 66 is adjacent to the fifth rear sprocket 65 without another sprocket in between.

The sixth rear sprocket 66 has a hub engagement profile 66a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 66 a of the sixth rear sprocket 66 is disposed on an inner peripheral surface of the sixth rear sprocket 66.

The seventh rear sprocket 67 has a seventh tooth tip diameter which is smaller than the sixth tooth tip diameter of the sixth rear sprocket 66. In the axial direction, the seventh rear sprocket 67 is adjacent to the sixth rear sprocket 66 without another sprocket in between.

The seventh rear sprocket 67 has a hub engagement profile 67a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 67a of the seventh rear sprocket 67 is provided on an inner peripheral surface of the seventh rear sprocket 67.

The eighth rear sprocket 68 has an eighth tooth tip diameter which is smaller than the seventh tooth tip diameter of the seventh rear sprocket 67. In the axial direction, the eighth rear sprocket 68 is adjacent to the seventh rear sprocket 67 without another sprocket in between.

The eighth rear sprocket 68 has a hub engagement profile 68a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 68 a of the eighth rear sprocket 68 is disposed on an inner peripheral surface of the eighth rear sprocket 68.

As shown in FIG. 10A, a plurality of axial spacers 81a, 81b, 81c, 81d, 81e, 81f are configured to bridge one of adjacent rear sprockets 62, 63, 64, 65, 66, 67, 68 Axial spacing. For example, the plurality of axial spacers include first to sixth axial spacers 81a, 81b, 81c, 81d, 81e, 81f.

The first axial spacer 81 a is disposed between the second rear sprocket 62 and the third rear sprocket 63. The second axial spacer 81 b is disposed between the third rear sprocket 63 and the fourth rear sprocket 64. The third axial spacer 81c is disposed between the fourth rear sprocket 64 and the fifth rear sprocket 65.

The fourth axial spacer 81 d is disposed between the fifth rear sprocket 65 and the sixth rear sprocket 66. The fifth axial spacer 81e is disposed between the sixth rear sprocket 66 and the seventh rear sprocket 67. The sixth axial spacer 81f is disposed between the seventh rear sprocket 67 and the eighth rear sprocket 68.

As shown in FIG. 10B, the replacement rear sprocket 85 functions as the second rear sprocket 62 in the second installation state. The replacement rear sprocket 85 is disposed at the same axial position as the second rear sprocket 62 in the second installation state.

The replacement rear sprocket 85 has a hub engagement profile 85a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 85 a of the replacement rear sprocket 85 is provided on an inner peripheral surface of the replacement rear sprocket 85.

In the second installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the first rear sprocket 61 and the second rear sprocket 62 can be replaced by the replacement rear sprocket 85, wherein the first rear sprocket 61 and the second rear sprocket 62 are replaced by the replacement rear sprocket 85, so that one of the remaining sprockets of the plurality of sprockets 61, 62, 63, 64, 65, 66, 67, 68 is maintained in the second installation state Axial position.

The first rear sprocket 61 and the second rear sprocket 62 are replaced by a replacement rear sprocket 85, so that one of the plurality of rear sprocket 61, 62, 63, 64, 65, 66, 67, 68 is maintained in the second installation state One axial position of each remaining sprocket. The remaining sprockets of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68 are each of the third to eighth rear sprockets 63, 64, 65, 66, 67, 68. In this embodiment, the replacement rear sprocket 85 functions as a largest rear sprocket in the second installation state.

As shown in FIG. 10B, in the second installation state, the replacement rear sprocket 85 is disposed between the third rear sprocket 63 and the sprocket abutment surface 29 b of the bicycle rear hub assembly 29. Specifically, in the second installation state, the replacement rear sprocket 85 is disposed between the first axial spacer 81a and the sprocket abutment surface 29b of the bicycle rear hub assembly 29.

Thereby, the replacement rear sprocket 85 and the third to eighth rear sprockets 63, 64, 65, 66, 67, 68 in the second installation state are respectively arranged with the second to eighth rear sprocket in the first installation state. The sprocket wheels 62, 63, 64, 65, 66, 67, 68 are at the same axial position. Eighth embodiment

The configuration of the bicycle 1 of the eighth embodiment is substantially the same as that of the first embodiment. In the eighth embodiment, the explanation of the configuration of the bicycle 1 is omitted.

＜Bicycle rear sprocket system＞

As shown in FIGS. 11A and 11B, the bicycle rear sprocket system 50 includes a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67 and a sprocket carrier 71. The bicycle rear sprocket system 50 further includes a plurality of axial spacers. The bicycle rear sprocket system 50 further includes an alternative sprocket carrier 90. The bicycle rear sprocket system 50 further includes an alternative rear sprocket 85.

The bicycle rear sprocket system 50 is held on the bicycle rear hub assembly 29 by the locking member 30. The bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29 in a first installation state or a second installation state.

FIG. 11A indicates the bicycle rear sprocket system 50 in the first installation state. FIG. 11B indicates the bicycle rear sprocket system 50 in the second installation state.

As shown in FIG. 11A, the plurality of rear sprockets includes a first rear sprocket 61, a second rear sprocket 62 and a third rear sprocket 63. The first rear sprocket 61 is an example of the first rear sprocket 61 in the technical solution 13. The second rear sprocket 62 is an example of one of the second rear sprocket 62 in the technical solution 13. The third rear sprocket 63 is an example of the third rear sprocket 63 in the technical solution 13.

The plurality of rear sprockets further include a fourth rear sprocket 64, a fifth rear sprocket 65, a sixth rear sprocket 66, and a seventh rear sprocket 67.

The first rear sprocket 61 has a first tooth tip diameter. In the first installation state in which the bicycle rear sprocket system 50 is installed to a bicycle rear hub assembly 29, the first rear sprocket 61 is a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67 One of the largest sprockets.

The first rear sprocket 61 does not have a hub engagement profile. In other words, the first rear sprocket 61 is not directly engaged with the sprocket support body 29a of the bicycle rear hub assembly 29.

The second rear sprocket 62 has a second tooth tip diameter which is smaller than the first tooth tip diameter of the first rear sprocket 61. In the axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, the second rear sprocket 62 is adjacent to the first rear sprocket 61 and is located therebetween. There is no other sprocket in between.

The second rear sprocket 62 does not have a hub engagement profile. In other words, the second rear sprocket 62 does not directly engage with the sprocket support body 29a of the bicycle rear hub assembly 29.

The third rear sprocket 63 has a third tooth tip diameter which is smaller than the second tooth tip diameter of the second rear sprocket 62. In the axial direction, the third rear sprocket 63 is adjacent to the second rear sprocket 62 without another sprocket in between.

The third rear sprocket 63 has a hub engagement profile 63a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 63 a of the third rear sprocket 63 is disposed on an inner peripheral surface of the third rear sprocket 63.

The fourth rear sprocket 64 has a fourth tooth tip diameter which is smaller than the third tooth tip diameter of the third rear sprocket 63. In the axial direction with respect to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, the fourth rear sprocket 64 is adjacent to the third rear sprocket 63 and is located therebetween. There is no other sprocket in between.

The fourth rear sprocket 64 has a hub engagement profile 64a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 64 a of the fourth rear sprocket 64 is disposed on an inner peripheral surface of the fourth rear sprocket 64.

The fifth rear sprocket 65 has a fifth tooth tip diameter which is smaller than the fourth tooth tip diameter of the fourth rear sprocket 64. In the axial direction, the fifth rear sprocket 65 is adjacent to the fourth rear sprocket 64 without another sprocket in between.

The fifth rear sprocket 65 has a hub engagement profile 65a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 65 a of the fifth rear sprocket 65 is disposed on an inner peripheral surface of the fifth rear sprocket 65.

The sixth rear sprocket 66 has a sixth tooth tip diameter which is smaller than the fifth tooth tip diameter of the fifth rear sprocket 65. In the axial direction, the sixth rear sprocket 66 is adjacent to the fifth rear sprocket 65 without another sprocket in between.

The sixth rear sprocket 66 has a hub engagement profile 66a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 66 a of the sixth rear sprocket 66 is disposed on an inner peripheral surface of the sixth rear sprocket 66.

The seventh rear sprocket 67 has a seventh tooth tip diameter which is smaller than the sixth tooth tip diameter of the sixth rear sprocket 66. In the axial direction, the seventh rear sprocket 67 is adjacent to the sixth rear sprocket 66 without another sprocket in between.

The seventh rear sprocket 67 has a hub engagement profile 67a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 67a of the seventh rear sprocket 67 is provided on an inner peripheral surface of the seventh rear sprocket 67.

As shown in FIG. 11A, a plurality of axial spacers are configured to bridge one of two adjacent parts of the third to seventh rear sprockets 63, 64, 65, 66, 67 and the sprocket carrier 71 Axial spacing. For example, the plurality of axial spacers include first to fifth axial spacers 81a, 81b, 81c, 81d, 81e.

The first axial spacer 81 a is disposed between the sprocket carrier 71 and the third rear sprocket 63. The second axial spacer 81 b is disposed between the third rear sprocket 63 and the fourth rear sprocket 64. The third axial spacer 81c is disposed between the fourth rear sprocket 64 and the fifth rear sprocket 65.

The fourth axial spacer 81 d is disposed between the fifth rear sprocket 65 and the sixth rear sprocket 66. The fifth axial spacer 81e is disposed between the sixth rear sprocket 66 and the seventh rear sprocket 67.

As shown in FIG. 11A, the sprocket carrier 71 is configured to support only the first rear sprocket 61 and the second rear sprocket 62. Specifically, in the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the sprocket carrier 71 is configured to support only the first rear sprocket 61 and the second rear sprocket 62 .

The sprocket carrier 71 has a hub engagement profile 71a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement contour 71 a of the sprocket carrier 71 is disposed on an inner peripheral surface of the sprocket carrier 71.

For example, in the first installation state, the sprocket carrier 71 is disposed between the second rear sprocket 62 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29. Specifically, in the first installation state, the sprocket carrier 71 is disposed between the first axial spacer 81a and the sprocket abutment surface 29b of the bicycle rear hub assembly 29.

The sprocket carrier 71 supports the first rear sprocket 61 and the second rear sprocket 62 via a common fastener 69. In other words, the first rear sprocket 61, the second rear sprocket 62 and the sprocket carrier 71 are fixed together by the common fastener 69, so that the sprocket carrier 71 is positioned in the first axial direction in the first installation state. Between the rear sprocket 61 and the second rear sprocket 62.

As shown in FIG. 11B, the sprocket carrier 71 may be replaced with an alternative sprocket carrier 90. Specifically, the sprocket carrier 71 can be replaced by a substitute sprocket carrier 90, so that one axis of each remaining sprocket of the plurality of rear sprocket 61, 62, 63, 64, 65, 66, 67 is maintained in the second installation state To position.

The remaining sprockets of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67 are each of the third to seventh rear sprockets 63, 64, 65, 66, 67.

The replacement sprocket carrier 90 has a hub engagement profile 90a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 90a of the replacement sprocket carrier 90 is provided on an inner peripheral surface of the replacement sprocket carrier 90.

The replacement rear sprocket 85 serves as the second rear sprocket 62 in the second installation state. The replacement rear sprocket 85 is disposed at the same axial position as the second rear sprocket 62 in the second installation state. The replacement rear sprocket 85 is supported by the replacement sprocket carrier 90. In this embodiment, the replacement rear sprocket 85 functions as a largest rear sprocket in the second installation state.

In the second installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the replacement sprocket carrier 90 only supports the replacement rear sprocket 85, wherein the sprocket carrier 71 is replaced by the replacement sprocket carrier 90, so that In the second installation state, one of the axial positions of the remaining sprockets of the plurality of sprockets 61, 62, 63, 64, 65, 66, 67 is maintained.

For example, in the second installation state, the replacement sprocket carrier 90 is disposed between the replacement rear sprocket 85 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29. Specifically, in the second installation state, the replacement sprocket carrier 90 is disposed between the first axial spacer 81a and the sprocket abutment surface 29b of the bicycle rear hub assembly 29.

The replacement sprocket carrier 90 supports the replacement rear sprocket 85 via a fastener 70. In other words, the replacement rear sprocket 85 and the replacement sprocket carrier 90 are fixed together by the fastener 70, so that the replacement sprocket carrier 90 is positioned on the replacement rear sprocket 85 and the bicycle rear hub in the axial direction in the second installation state. The sprocket of the assembly 29 abuts between the surfaces 29b.

Thereby, the replacement rear sprocket 85 and the third to seventh rear sprockets 63, 64, 65, 66, 67 in the second installation state are respectively arranged with the second to seventh rear sprockets in the first installation state 62, 63, 64, 65, 66, 67 at the same axial position. Ninth embodiment

The configuration of the bicycle 1 of the ninth embodiment is substantially the same as that of the first embodiment. In the ninth embodiment, the explanation of the configuration of the bicycle 1 is omitted.

＜Bicycle rear sprocket system＞

As shown in FIGS. 12A and 12B, the bicycle rear sprocket system 50 includes a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68 and a sprocket carrier 71. The bicycle rear sprocket system 50 further includes a plurality of axial spacers 81a, 81b, 81c, 81d, 81e.

The bicycle rear sprocket system 50 further includes an alternative sprocket carrier 90. The bicycle rear sprocket system 50 further includes a replacement rear sprocket 85 and a further replacement rear sprocket 86.

The bicycle rear sprocket system 50 is held on the bicycle rear hub assembly 29 by the locking member 30. The bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29 in a first installation state or a second installation state.

FIG. 12A indicates the bicycle rear sprocket system 50 in the first installation state. FIG. 12B indicates the bicycle rear sprocket system 50 in the second installation state.

As shown in FIG. 12A, the plurality of rear sprockets includes a first rear sprocket 61, a second rear sprocket 62 and a third rear sprocket 63. The first rear sprocket 61 is an example of one of the first sprocket in the technical solution 14. The second rear sprocket 62 is an example of one of the second sprocket in the technical solution 14. The third rear sprocket 63 is an example of a third sprocket in the technical solution 14.

The plurality of rear sprockets further include a fourth rear sprocket 64, a fifth rear sprocket 65, a sixth rear sprocket 66, a seventh rear sprocket 67, and an eighth rear sprocket 68.

The first rear sprocket 61 has a first tooth tip diameter. In the first installation state in which the bicycle rear sprocket system 50 is installed to a bicycle rear hub assembly 29, the first rear sprocket 61 is a plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, One of the largest sprocket in 68.

The first rear sprocket 61 does not have a hub engagement profile. In other words, the first rear sprocket 61 is not directly engaged with the sprocket support body 29a of the bicycle rear hub assembly 29.

The second rear sprocket 62 has a second tooth tip diameter which is smaller than the first tooth tip diameter of the first rear sprocket 61. In an axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68, the second rear sprocket 62 is adjacent to the first rear sprocket 61 and There is no other sprocket in between.

The second rear sprocket 62 does not have a hub engagement profile. In other words, the second rear sprocket 62 does not directly engage with the sprocket support body 29a of the bicycle rear hub assembly 29.

The third rear sprocket 63 has a third tooth tip diameter which is smaller than the second tooth tip diameter of the second rear sprocket 62. In the axial direction, the third rear sprocket 63 is adjacent to the second rear sprocket 62 without another sprocket in between.

The third rear sprocket 63 does not have a hub engagement profile. In other words, the third rear sprocket 63 is not directly engaged with the sprocket support body 29a of the bicycle rear hub assembly 29.

The fourth rear sprocket 64 has a fourth tooth tip diameter which is smaller than the third tooth tip diameter of the third rear sprocket 63. In the axial direction relative to the rotation center axis C1 of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68, the fourth rear sprocket 64 is adjacent to the third rear sprocket 63 and is positioned at There is no other sprocket between them.

The fourth rear sprocket 64 has a hub engagement profile 64a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 64 a of the fourth rear sprocket 64 is disposed on an inner peripheral surface of the fourth rear sprocket 64.

The fifth rear sprocket 65 has a fifth tooth tip diameter which is smaller than the fourth tooth tip diameter of the fourth rear sprocket 64. In the axial direction, the fifth rear sprocket 65 is adjacent to the fourth rear sprocket 64 without another sprocket in between.

The fifth rear sprocket 65 has a hub engagement profile 65a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 65 a of the fifth rear sprocket 65 is disposed on an inner peripheral surface of the fifth rear sprocket 65.

The sixth rear sprocket 66 has a sixth tooth tip diameter which is smaller than the fifth tooth tip diameter of the fifth rear sprocket 65. In the axial direction, the sixth rear sprocket 66 is adjacent to the fifth rear sprocket 65 without another sprocket in between.

The sixth rear sprocket 66 has a hub engagement profile 66a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 66 a of the sixth rear sprocket 66 is disposed on an inner peripheral surface of the sixth rear sprocket 66.

The seventh rear sprocket 67 has a seventh tooth tip diameter which is smaller than the sixth tooth tip diameter of the sixth rear sprocket 66. In the axial direction, the seventh rear sprocket 67 is adjacent to the sixth rear sprocket 66 without another sprocket in between.

The seventh rear sprocket 67 has a hub engagement profile 67a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 67a of the seventh rear sprocket 67 is provided on an inner peripheral surface of the seventh rear sprocket 67.

The eighth rear sprocket 68 has an eighth tooth tip diameter which is smaller than the seventh tooth tip diameter of the seventh rear sprocket 67. In the axial direction, the eighth rear sprocket 68 is adjacent to the seventh rear sprocket 67 without another sprocket in between.

The eighth rear sprocket 68 has a hub engagement profile 68a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 68 a of the eighth rear sprocket 68 is disposed on an inner peripheral surface of the eighth rear sprocket 68.

As shown in FIG. 12A, a plurality of axial spacers 81a, 81b, 81c, 81d, 81e are configured to bridge the fourth to eighth rear sprockets 64, 65, 66, 67, 68 and the sprocket carrier 71 An axial distance between two adjacent parts. For example, the plurality of axial spacers include first to fifth axial spacers 81a, 81b, 81c, 81d, 81e.

The first axial spacer 81 a is disposed between the sprocket carrier 71 and the fourth rear sprocket 64. The second axial spacer 81 b is disposed between the fourth rear sprocket 64 and the fifth rear sprocket 65. The third axial spacer 81c is disposed between the fifth rear sprocket 65 and the sixth rear sprocket 66.

The fourth axial spacer 81 d is disposed between the sixth rear sprocket 66 and the seventh rear sprocket 67. The fifth axial spacer 81e is disposed between the seventh rear sprocket 67 and the eighth rear sprocket 68.

As shown in FIG. 12A, the sprocket carrier 71 is configured to support the second rear sprocket 62 and the third rear sprocket 63. The second rear sprocket 62 is configured to support the first rear sprocket 61. In other words, the first rear sprocket 61 is supported by the second rear sprocket 62. The first rear sprocket 61 is supported by the sprocket carrier 71 via the second rear sprocket 62.

Specifically, in the first installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the sprocket carrier 71 supports the second rear sprocket 62 and the third rear sprocket 63 and the second rear chain The wheel 62 supports the first rear sprocket 61.

The sprocket carrier 71 has a hub engagement profile 71a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement contour 71 a of the sprocket carrier 71 is disposed on an inner peripheral surface of the sprocket carrier 71.

For example, the sprocket carrier 71 is disposed between the second rear sprocket 62 and the third rear sprocket 63, and the second rear sprocket 62 is disposed between the first rear sprocket 61 and the sprocket carrier 71.

The sprocket carrier 71 supports the second rear sprocket 62 and the third rear sprocket 63 via a first fastener 69. The second rear sprocket 62 supports the first rear sprocket 61 via a second fastener 70.

In other words, the second rear sprocket 62 and the third rear sprocket 63 are fixed to the sprocket carrier 71 together by the first fastener 69. The first rear sprocket 61 is fixed to the second rear sprocket 62 by a second fastener 70.

As shown in FIG. 12B, the first rear sprocket 61, the second rear sprocket 62, the third rear sprocket 63 and the sprocket carrier 71 are replaced by the rear sprocket 85, and further replaced by the rear sprocket 86 and the sprocket carrier 90 replace. In this embodiment, the replacement rear sprocket 85 functions as a largest rear sprocket in the second installation state.

Specifically, the first rear sprocket 61, the second rear sprocket 62, the third rear sprocket 63, and the sprocket carrier 71 can be replaced with a substitute sprocket carrier 90, so that a plurality of rear sprocket wheels are maintained in the second installation state One of the axial positions of each remaining sprocket of 61, 62, 63, 64, 65, 66, 67, 68. The remaining sprockets of the plurality of rear sprockets 61, 62, 63, 64, 65, 66, 67, 68 are each of the fourth to eighth rear sprockets 64, 65, 66, 67, 68.

As shown in FIG. 12B, the replacement rear sprocket 85 serves as the second rear sprocket 62 in the second installation state. The replacement rear sprocket 85 is disposed at the same axial position as the second rear sprocket 62 in the second installation state. The replacement rear sprocket 85 is supported by the replacement sprocket carrier 90.

The rear sprocket 86 is further replaced as the third rear sprocket 63 in the second installation state. It is further replaced that the rear sprocket 86 is arranged at the same axial position as the third rear sprocket 63 in the second installation state. Further replacing the rear sprocket 86 is supported by the replacement sprocket carrier 90.

The replacement sprocket carrier 90 has a hub engagement profile 90a that can be engaged with the sprocket support body 29a of the bicycle rear hub assembly 29. The hub engagement profile 90a of the replacement sprocket carrier 90 is provided on an inner peripheral surface of the replacement sprocket carrier 90.

The replacement sprocket carrier 90 supports the replacement rear sprocket 85 and the further replacement sprocket 86 via a third common fastener 74. In other words, the replacement rear sprocket 85, the further replacement rear sprocket 86, and the replacement sprocket carrier 90 are fixed together by the third common fastener 74, so that the replacement sprocket carrier 90 is positioned in the axial direction in the second installation state Between the third rear sprocket 63 and the sprocket abutting surface 29b of the bicycle rear hub assembly 29.

In the second installation state in which the bicycle rear sprocket system 50 is installed to the bicycle rear hub assembly 29, the replacement sprocket carrier 90 only supports the replacement sprocket and further replacement sprocket, wherein the sprocket carrier 71 is replaced by the sprocket carrier 90 Replaced so that one of the remaining sprockets of the plurality of sprockets 61, 62, 63, 64, 65, 66, 67, 68 is maintained in the second installation state.

For example, the replacement sprocket carrier 90 is disposed between the fourth rear sprocket 64 and the sprocket abutment surface 29b of the bicycle rear hub assembly 29. Specifically, the replacement sprocket carrier 90 is disposed between the first axial spacer 81a and the sprocket abutting surface 29b of the bicycle rear wheel hub assembly 29.

Thereby, the replacement rear sprocket 85 in the second installation state, the further replacement rear sprocket 86, and the fourth to eighth rear sprocket 64, 65, 66, 67, 68 are respectively arranged with the first installation state in the first installation state. The second to eighth rear sprockets 62, 63, 64, 65, 66, 67, 68 are at the same axial position. Other embodiments

As a variation of the above-mentioned embodiment, the bicycle 1 may be configured as follows.

(A) In the above-mentioned second to sixth embodiments, the explanation of the bicycle rear sprocket system 50 is performed as an example of at least one alternative axial spacer 75 used in the second installation state.

As shown in FIG. 13, at least one alternative axial spacer 75 may include a metal portion 75a and a non-metal portion 75b. For example, at least one alternative axial spacer 75 is an alternative axial spacer.

The metal portion 75a and the non-metal portion 75b are preferably adjacent to each other in the axial direction in the second installation state. The metal portion 75a is configured to abut the sprocket abutment surface 29b of the rear wheel hub assembly 29 of the bicycle.

The non-metal portion 75b is configured to be disposed on an opposite side of the sprocket abutment surface 29b of the bicycle rear hub assembly 29 with respect to the metal portion in the second installation state. The non-metallic portion 75b is adjacent to the largest sprocket 77 or the sprocket carrier 71 of the bicycle rear sprocket system 50 in the second installation state.

The metal part 75a may be integrally provided as a unit with the non-metal part 75b. For example, in a state in which the metal part 75a and the non-metal part 75b are coupled by a coupling member (such as an adhesive), the metal part 75a and the non-metal part 75b are mounted on the bicycle rear wheel hub assembly 29.

The metal part 75a may be provided separately from the non-metal part 75b. For example, the metal part 75a and the non-metal part 75b are arranged on the bicycle rear wheel hub assembly 29 without a coupling member (such as an adhesive).

(B) The bicycle rear sprocket system 50 of the second to ninth embodiments described above can be configured as follows.

The explanation of this embodiment is performed with the second embodiment shown in FIG. 4. For example, as shown in FIG. 14, in a pre-installed state in which the bicycle rear sprocket system 50 is not installed to the bicycle rear hub assembly 29, a plurality of sprockets 63, 64, 65, 66, 67 and at least one replacement The axial spacers 75 can be fixed relative to each other by a common fastener 91 as a unit.

For example, the third to seventh sprockets 63, 64, 65, 66, 67, the replacement axial spacer 75, the replacement rear sprocket 85, and the first to fifth axial spacers 81a, 81b, 81c, 81d, 81e In the pre-installed state, the common fastener 91 is used as a unit to be fixed relative to each other.

(C) Each of the above-mentioned axial spacers may include a plurality of axial spacers in any of the above-mentioned embodiments. In other words, a plurality of spacer configurations can bridge an axial distance between adjacent sprockets or an axial distance between a sprocket and a sprocket abutting surface of a bicycle rear wheel hub assembly. Spacer.

1: bicycle 9: Bicycle chain 11: Frame 13: handle 17: front wheel 17a: front tire 19: rear wheel 19a: Rear tire 20: Fork 24: Shift device 25: Transmission system 27: crank assembly 28: Bicycle rear sprocket assembly 29: Bicycle rear wheel hub assembly 29a: Sprocket support body 29b: Sprocket abutment surface 29c: Sprocket engagement profile 30: Locking parts 35: Bicycle front sprocket 50: Bicycle rear sprocket system 51: The first sprocket group 51a to 51e: first rear sprocket 52: The second sprocket group 52a: second rear sprocket 52b: second rear sprocket 52b’: Replace the second rear sprocket 52c: Sprocket carrier 52d: Replacement of axial spacer 53: The first hub joint structure 54: The second wheel hub joint structure 61: First rear sprocket 61a: Hub joint profile 62: second rear sprocket 62a: Hub joint profile 63: third rear sprocket 63a: Hub joint profile 64: Fourth rear sprocket 64a: Hub joint profile 65: Fifth rear sprocket 65a: Hub joint profile 66: Sixth rear sprocket 66a: Hub joint profile 67: Seventh rear sprocket 67a: Hub joint profile 68: Eighth rear sprocket 68a: Hub joint profile 69: common fasteners 70: Common fasteners 71: sprocket carrier 71a: Hub joint profile 72: second sprocket carrier 72a: Hub joint profile 73: The third sprocket carrier 74: Third common fastener 75: Replacement of axial spacer 75a: Metal part 75b: Non-metallic part 76: Replacement of axial spacer 77: Largest sprocket 81a to 81f: Axial spacer 85: Replace the rear sprocket 85a: Hub joint profile 86: Further replace the rear sprocket 90: Alternative sprocket carrier 90a: Hub joint profile 91: common fasteners C1: Rotation center axis

Reference is now made to the accompanying drawings, which form part of the present invention:

Figure 1 is a side view of a bicycle according to an embodiment of the present invention;

Figure 2 is a side view of a rear wheel hub assembly of a bicycle according to a first embodiment of the present invention;

3A is a side view of a bicycle rear sprocket system in a first installation state according to the first embodiment of the present invention;

3B is a side view of the bicycle rear sprocket system in a second installation state according to the first embodiment of the present invention;

4A is a side view of a bicycle rear sprocket system in a first installation state according to the first embodiment of the present invention;

4B is a side view of the bicycle rear sprocket system in the second installation state according to the second embodiment of the present invention;

5A is a side view of a bicycle rear sprocket system in a first installation state according to the third embodiment of the present invention;

5B is a side view of the bicycle rear sprocket system in the second installation state according to the third embodiment of the present invention;

6A is a side view of a bicycle rear sprocket system in a first installation state according to a variation of the third embodiment of the present invention;

6B is a side view of the bicycle rear sprocket system in the second installation state according to the modification of the third embodiment of the present invention;

7A is a side view of a bicycle rear sprocket system in a first installation state according to a fourth embodiment of the present invention;

7B is a side view of the bicycle rear sprocket system in the second installation state according to the fourth embodiment of the present invention;

8A is a side view of a bicycle rear sprocket system in a first installation state according to a fifth embodiment of the present invention;

8B is a side view of the bicycle rear sprocket system in the second installation state according to the fifth embodiment of the present invention;

9A and 9B are respectively a side view of a bicycle rear sprocket system in one of the first installation state and the second installation state according to the sixth embodiment of the present invention;

9C and 9D are respectively a side view of the bicycle rear sprocket system in a first installation state and a second installation state according to an alternative configuration of the sixth embodiment of the present invention;

10A is a side view of a bicycle rear sprocket system in a first installation state according to a seventh embodiment of the present invention;

10B is a side view of the bicycle rear sprocket system in the second installation state according to the seventh embodiment of the present invention;

11A is a side view of a bicycle rear sprocket system in a first installation state according to the eighth embodiment of the present invention;

11B is a side view of the bicycle rear sprocket system in the second installation state according to the eighth embodiment of the present invention;

12A is a side view of a bicycle rear sprocket system in a first installation state according to the ninth embodiment of the present invention;

12B is a side view of the bicycle rear sprocket system in the second installation state according to the ninth embodiment of the present invention;

Figure 13 is a side view of an alternative axial spacer in a second installation state according to other embodiments of the present invention; and

Figure 14 is a side view of a common fastener in pre-installation according to other embodiments of the present invention.

29: Bicycle rear wheel hub assembly

29a: Sprocket support body

29b: Sprocket abutment surface

29c: Sprocket engagement profile

30: Locking parts

50: Bicycle rear sprocket system

51: The first sprocket group

51a to 51e: first rear sprocket

52: The second sprocket group

52a: second rear sprocket

52b: second rear sprocket

52b’: Replace the second rear sprocket

52c: Sprocket carrier

52d: Replacement of axial spacer

53: The first hub joint structure

54: The second wheel hub joint structure

C1: Rotation center axis

Claims (14)

A bicycle rear sprocket system, which includes: A first sprocket group including at least one first rear sprocket; and A second chain wheel group, which includes a plurality of second rear chain wheels; In a first installation state in which one of the plurality of second rear sprockets is a first number, the first sprocket group and the second sprocket group are installed to a bicycle rear hub assembly ;and In a second installation state in which the total number of the plurality of second rear sprockets is changed from the first number to a second number different from the first number, one of the at least one first rear sprockets is maintained Axial position. Such as the bicycle rear sprocket system of claim 1, where The first sprocket group has a first hub engagement structure; and The second sprocket group has a second hub engagement structure. Such as the bicycle rear sprocket system of claim 1, where In each of the first installation state and the second installation state, the second sprocket group is arranged to the bicycle rear hub assembly closer to the bicycle rear hub assembly than the first sprocket group An axial center plane. A bicycle rear sprocket system, which includes: Multiple sprockets, including: A first sprocket having a first tooth tip diameter, wherein the bicycle rear sprocket system is installed in a first installation state of a bicycle rear hub assembly, the first sprocket is the plurality of sprockets One of the largest sprocket; A second sprocket having a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket, in an axial direction relative to a rotation center axis of the plurality of sprocket wheels, the The second sprocket is adjacent to the first sprocket without another sprocket in between; A third sprocket having a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket, in the axial direction, the third sprocket is adjacent to the second sprocket There is no other sprocket between them; and A fourth sprocket having a fourth tooth tip diameter that is smaller than the third tooth tip diameter of the third sprocket, and in the axial direction, the fourth sprocket is adjacent to the third sprocket. There is no other sprocket between them; and A sprocket carrier configured to support at least the first sprocket and the second sprocket; and At least one axial spacer configured to bridge a replacement sprocket and a chain of the bicycle rear hub assembly in a second installation state in which the bicycle rear sprocket system is mounted to the bicycle rear hub assembly An axial distance between wheel abutment surfaces, wherein the sprocket carrier is replaced by the at least one axial spacer and the replacement sprocket, so that each remaining chain of the plurality of rear sprocket wheels is maintained in the second installation state The axial position of one of the wheels. Such as the bicycle rear sprocket system of claim 4, where The sprocket carrier has a first hub engagement profile that can be engaged with a sprocket support body of the bicycle rear hub assembly; The second sprocket has a second hub engagement profile that can be engaged with the sprocket support body of the bicycle rear hub assembly; The first sprocket does not have a hub engagement profile; and The first sprocket, the second sprocket, and the sprocket carrier are fixed together by a common fastener, so that the sprocket carrier is positioned on the first chain in the axial direction in the first installation state Between the wheel and the second sprocket. A bicycle rear sprocket system, which includes: Multiple sprockets, including: A first sprocket having a first tooth tip diameter, wherein the bicycle rear sprocket system is installed in a first installation state of a bicycle rear hub assembly, the first sprocket is the plurality of sprockets One of the largest sprocket; A second sprocket having a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket, in an axial direction relative to a rotation center axis of the plurality of sprocket wheels, the The second sprocket is adjacent to the first sprocket without another sprocket in between; A third sprocket having a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket, in the axial direction, the third sprocket is adjacent to the second sprocket There is no other sprocket between them; and A fourth sprocket having a fourth tooth tip diameter that is smaller than the third tooth tip diameter of the third sprocket, and in the axial direction, the fourth sprocket is adjacent to the third sprocket. There is no other sprocket between them; A first sprocket carrier configured to support at least the first sprocket; and A second sprocket carrier configured to support at least one of the second sprocket, the third sprocket, and the fourth sprocket. In the axial direction, the second sprocket carrier is adjacent to The first sprocket carrier without another sprocket carrier in between; and At least one axial spacer configured to bridge a replacement sprocket and a chain of the bicycle rear hub assembly in a second installation state in which the bicycle rear sprocket system is mounted to the bicycle rear hub assembly An axial distance between wheel abutment surfaces, wherein the first sprocket carrier is replaced by the at least one axial spacer and the replacement sprocket, so that each of the plurality of rear sprocket wheels is maintained in the second installation state The axial position of one of the remaining sprockets. A bicycle rear sprocket system, which includes: Multiple sprockets, including: A first sprocket having a first tooth tip diameter, wherein the bicycle rear sprocket system is installed in a first installation state of a bicycle rear hub assembly, the first sprocket is the plurality of sprockets One of the largest sprocket; and A second sprocket having a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket, in an axial direction relative to a rotation center axis of the plurality of sprocket wheels, the The second sprocket is adjacent to the first sprocket without another sprocket in between; and At least one axial spacer configured to bridge the second sprocket and one of a bicycle rear hub assembly in a second installation state in which the bicycle rear sprocket system is mounted to the bicycle rear hub assembly An axial distance between the abutting surfaces of the sprocket, wherein the first sprocket is replaced by the at least one axial spacer, so that one of the remaining sprockets of the plurality of rear sprocket wheels is maintained in the second installation state Axial position. A bicycle rear sprocket system, which includes: Multiple sprockets, including: A first sprocket having a first tooth tip diameter, wherein the bicycle rear sprocket system is installed in a first installation state of a bicycle rear hub assembly, the first sprocket is the plurality of sprockets One of the largest sprocket; and A second sprocket having a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket, in an axial direction relative to a rotation center axis of the plurality of sprocket wheels, the The second sprocket is adjacent to the first sprocket without another sprocket in between; and A sprocket carrier configured to support only the first sprocket; and At least one axial spacer configured to bridge the second sprocket and one of the bicycle rear hub assembly in a second installation state in which the bicycle rear sprocket system is mounted to the bicycle rear hub assembly An axial distance between abutting surfaces of the sprocket, wherein the sprocket carrier is replaced by the at least one axial spacer, so that one axis of each remaining sprocket of the plurality of rear sprocket wheels is maintained in the second installation state To position. A bicycle rear sprocket system, which includes: Multiple sprockets, including: A first sprocket having a first tooth tip diameter, wherein the bicycle rear sprocket system is installed in a first installation state of a bicycle rear hub assembly, the first sprocket is the plurality of sprockets One of the largest sprocket; A second sprocket having a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket, in an axial direction relative to a rotation center axis of the plurality of sprocket wheels, the The second sprocket is adjacent to the first sprocket without another sprocket in between; A third sprocket having a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket, in the axial direction, the third sprocket is adjacent to the second sprocket There is no other sprocket between them; and A fourth sprocket having a fourth tooth tip diameter that is smaller than the third tooth tip diameter of the third sprocket, and in the axial direction, the fourth sprocket is adjacent to the third sprocket. There is no other sprocket between them; and A sprocket carrier configured to support at least the second sprocket; and At least one axial spacer configured to bridge the sprocket carrier and a chain of a bicycle rear hub assembly in a second installation state in which the bicycle rear sprocket system is mounted to the bicycle rear hub assembly An axial distance between wheel abutment surfaces, wherein the first sprocket is replaced by the at least one axial spacer, so that one axis of each remaining sprocket of the plurality of rear sprocket wheels is maintained in the second installation state To position. Such as the bicycle rear sprocket system of any one of claims 4 to 9, where The at least one axial spacer includes: a metal portion configured to abut the sprocket abutting surface of the bicycle rear hub assembly; and a non-metallic portion configured to be in the second installed state It is arranged on an opposite side of the abutment surface of the sprocket of the bicycle rear wheel hub assembly with respect to the metal part. Such as the bicycle rear sprocket system of any one of claims 4 to 9, where In a pre-installed state in which the bicycle rear sprocket system is not installed to the bicycle rear hub assembly, the plurality of sprockets and the at least one axial spacer are fixed relative to each other as a unit by a common fastener . A bicycle rear sprocket system, which includes: Multiple sprockets, including: A first sprocket having a first tooth tip diameter, wherein the bicycle rear sprocket system is installed in a first installation state of a bicycle rear hub assembly, the first sprocket is the plurality of sprockets One of the largest sprocket; and A second sprocket having a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket, in an axial direction relative to a rotation center axis of the plurality of sprocket wheels, the The second sprocket is adjacent to the first sprocket without another sprocket in between; In a second installation state where the bicycle rear sprocket system is installed to the bicycle rear hub assembly, the first sprocket is supported by the second sprocket, and the first sprocket and the second sprocket can be The replacement sprocket is replaced, wherein the first sprocket and the second sprocket are replaced by the replacement sprocket, so that an axial position of each remaining sprocket of the plurality of sprocket wheels is maintained in the second installation state. A bicycle rear sprocket system, which includes: Multiple sprockets, including: A first sprocket having a first tooth tip diameter, wherein the bicycle rear sprocket system is installed in a first installation state of a bicycle rear hub assembly, the first sprocket is the plurality of sprockets One of the largest sprocket; A second sprocket having a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket, in an axial direction relative to a rotation center axis of the plurality of sprocket wheels, the The second sprocket is adjacent to the first sprocket without another sprocket in between; and A third sprocket having a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket, in the axial direction, the third sprocket is adjacent to the second sprocket There is no other sprocket between them; and A sprocket carrier configured to only support the first sprocket and the second sprocket; and In a second installation state in which the bicycle rear sprocket system is installed to the bicycle rear hub assembly, the sprocket carrier can be replaced with one that only supports a replacement sprocket, wherein the sprocket carrier is replaced by the sprocket carrier. The replacement sprocket carrier is replaced, so that one of the axial positions of the remaining sprocket wheels of the plurality of sprocket wheels is maintained in the second installation state. A bicycle rear sprocket system, which includes: Multiple sprockets, including: A first sprocket having a first tooth tip diameter, wherein the bicycle rear sprocket system is installed in a first installation state of a bicycle rear hub assembly, the first sprocket is the plurality of sprockets One of the largest sprocket; A second sprocket having a second tooth tip diameter smaller than the first tooth tip diameter of the first sprocket, in an axial direction relative to a rotation center axis of the plurality of sprocket wheels, the The second sprocket is adjacent to the first sprocket without another sprocket in between; and A third sprocket having a third tooth tip diameter smaller than the second tooth tip diameter of the second sprocket, in the axial direction, the third sprocket is adjacent to the second sprocket There is no other sprocket between them; and A sprocket carrier configured to support the second sprocket and the third sprocket; and In a second installation state where the bicycle rear sprocket system is installed to the bicycle rear hub assembly, the first sprocket is supported by the second sprocket, the first sprocket, the second sprocket, the The third sprocket and the sprocket carrier can be replaced with one of only supporting a replacement sprocket and a further replacement sprocket, wherein the sprocket carrier is replaced by the replacement sprocket carrier, so that in the second installation state Maintain one of the axial positions of each remaining sprocket of the plurality of sprocket wheels.

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