JP2000318058A - Manufacture of tire for two-wheeled vehicle and tire or two-wheeled vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a tire for a two-wheeled vehicle capable of forming a good hermetically sealed chamber in the tire while suppressing an increase in a labor hour and a time in the case of manufacturing the tire to a minimum limit. SOLUTION: A tire 1 has a first rubber layer 2 provided on the outer peripheral side of the tire 1, a plurality of layers of carcasses 3A, 3B and 3C, and a plurality of bead wires 4. The tire 1 for a two-wheeled vehicle is manufactured by interposing a release material 5 for preventing fusion bonding of the carcasses 3A, 3B when vulcanization molded between the carcasses 3A and 3B, pouring air between the carcasses 3A and 3B interposed with the material 5 after the vulcanization molding to form an air holding chamber 6. According to this method, since the material 5 may be interposed between the carcasses 3A and 3B in the step of laminating the tire 1 before the vulcanization molding, increases in a labor hour and a time in the case of manufacturing the tire can be suppressed to a minimum limit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tire for a motorcycle and a tire for a motorcycle, and more particularly to a method for manufacturing a tire for a motorcycle suitable for a bicycle and a tire for a motorcycle.

[0002]

2. Description of the Related Art A conventional tire for a bicycle or the like having a tube therein is manufactured as shown in FIGS. 7 (a) to 7 (d). First, two annular bead wires 41 made of metal, fiber, or the like are arranged at a predetermined interval, and an adhesive is impregnated on these bead wires 41 with a synthetic fiber such as nylon or a natural fiber such as cotton. (FIG. 7A), the both sides of the carcass 42 are folded back at the bead wire 41, and both ends 42a of the carcass 42 are overlapped and bonded (FIG. 7B). )reference). Then, both ends 4 of the carcass 42
An annular rubber layer 43 is overlapped on the portion where 2a is overlapped (FIG. 7).
(See FIG. 7C), vulcanization molding (see FIG. 7D), and the carcasses 42 and the carcass 42 and the rubber layer 43 are fused. When attaching this tire 40 to the rim,
A tube 44 with an air injection valve formed separately is inserted into the tire 40, and when the rim is attached, a rim flap is interposed to protect the tube 44 from directly hitting the rim ( Not shown).

In general, most bicycle tires 40 have a tube 44 which can be completely separated from the tire 40 as described above. However, a tubeless tire without such a tube 44 is used for a bicycle. It has been proposed to be used as well. When such a tubeless tire is realized, compared to the tire 40 having the tube 44, there is no tube, so that it is possible to reduce the number of parts and reduce the weight. In addition, if such a tubeless tire can be adopted for a bicycle, the thickness of the ground contact portion can be reduced, so that the tire becomes flexible and grip performance is considered to be improved.

[0004] However, although the adoption of tubeless tires in automobiles has been generalized, in motorcycles such as bicycles, unlike the case of employing tubeless tires in automobiles, the tires are greatly deformed by receiving a lateral load. May cause deformation of the rim or spokes, and in this case, a gap may be created between the tire and the rim and air in the tubeless tire may leak, thus preventing such a situation. Countermeasures are required.

[0005] As a motorcycle tire designed to cope with this, there is a tire disclosed in, for example, Japanese Patent Application Laid-Open No. 7-101202. As shown in FIGS. 8 and 9, this motorcycle tire has a rubber layer for preventing puncture on the entire inner surface of a tire 50 including a wheel contact portion containing an outer rubber 51, a cloth (carcass) layer 52 and a steel wire 53. After the tire 50 is vulcanized and formed into a tire shape, a soft rubber lid member 56 is bonded and attached to the inner peripheral opening of the tire 50, and an airtight chamber is provided inside the tire. 57 are formed. According to the tire 50, since there is no completely separable tube, there is an advantage that the weight can be reduced and grip performance is improved. Because it is closed to form an airtight chamber 57,
Even if the tire 50 is greatly deformed by receiving a lateral load, or the rim or spoke is deformed and a temporary gap is generated between the tire 50 and the rim, the air in the airtight chamber 57 can be satisfactorily improved. There are advantages to being retained.

[0006]

However, when manufacturing the tire 50 as shown in FIG. 8, after vulcanizing and molding to the shape of the tire 50, the lid 50 is held again while holding the vulcanized and molded tire 50. A separate step of bonding both sides of the material 56 is required separately, and it is also necessary to perform a process such as pressing after bonding the lid material 56 so that air does not escape from the bonded portion. It takes a lot of trouble and time.

In the case of manufacturing a motorcycle tire as shown in FIG. 9, a separate step of bonding the lid members 56 is additionally required, so that more labor and time are required. In addition, if these bonding and pressurizing treatments are to be performed well, the vulcanized tire 50 and the cover 56
Not only is it necessary to provide a jig or the like that securely holds the respective components, but also there is a deviation in the application range of the adhesive,
When the bonding range is too small, good airtightness may not be maintained if the bonding range is too small, and the airtight chamber 57 becomes small when the bonding range is too large. When used, there is a possibility that vibrations during cycling cannot be well absorbed.

Further, since the lid member 56 for closing the inner peripheral side opening of the tire 50 is made of soft rubber, when air is injected into the airtight chamber 57, only the lid member 56 expands greatly, and There are also problems that the closed chamber 57 is not maintained in a good shape, and that when the air injection valve is mounted on the soft rubber lid member 56, the lid member 56 expands and contracts, making the mounting operation very difficult.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and disadvantages, while minimizing an increase in labor and time required for manufacturing, while significantly deforming a tire due to a lateral load, or a rim or spoke. It is an object of the present invention to provide a method for manufacturing a motorcycle tire and a motorcycle tire capable of maintaining good airtightness in the tire even when the tire is deformed.

[0010]

According to the present invention, there is provided a method for manufacturing a tire for a motorcycle, comprising the steps of: providing a release layer between a plurality of tire layers; An object of the present invention is to manufacture a two-wheeled vehicle tire capable of forming an air holding chamber by injecting air between mounted layer materials.

According to this method, an increase in labor and time during manufacturing can be minimized, and even when the tire is greatly deformed by a lateral load or a rim or spoke is deformed. The airtightness in the tire can be kept good.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In a method for manufacturing a motorcycle tire according to claim 1 of the present invention, a release layer is interposed between layer materials of a tire composed of a plurality of layers, and the release layer is interposed. An object of the present invention is to manufacture a motorcycle tire capable of forming an air holding chamber by injecting air between layer materials. According to this method, in the tire laminating step before vulcanization molding, it is only necessary to interpose the release layer between the layer materials of the tire, so that an increase in labor and time during production is minimized. Can be suppressed. Further, an air holding chamber having good airtightness can be easily formed only by adjusting the size, position, material, and the like of the release layer.

According to a second aspect of the present invention, there is provided a method for manufacturing a two-wheeled vehicle tire according to the first aspect, wherein the tire is a rubber layer which is a layer material provided at least at a portion which finally forms a ground contact surface of the tire. Having a plurality of carcass, a plurality of bead wires, and a release layer, which are the other plurality of layer materials, and peeling to prevent the carcass from welding during vulcanization molding before vulcanization molding. The layer is interposed between the carcass, and after vulcanization molding, air is injected between the carcass on which the release layer is interposed to form an air holding chamber.

According to this method, since the entire surface of the air holding chamber is formed by the carcass, the air holding chamber can be held in a stable shape. According to a third aspect of the present invention, in the method for manufacturing a motorcycle tire according to the first aspect, a rubber layer, which is a layer material provided at least at a portion that finally forms a ground contact surface of the tire, and another layer material Having a carcass, a layer material for air retention as another layer material, a plurality of bead wires, and a release layer,
Vulcanization molding is performed with a release layer interposed between the carcass and the air holding layer material, and after vulcanization molding, air is blown between the carcass where the release layer is interposed and the air holding layer material. Is injected to form an air holding chamber.

According to this method, the air holding chamber is formed by the carcass and the air holding layer material.
The air holding chamber can be held in a stable shape.
In the tire for a motorcycle according to claim 4 of the present invention, the air holding chamber is formed by separating the layer materials from each other and injecting air between the layer materials between the layer materials of the tire having a plurality of layers. It is provided with a release layer that can be formed.

According to this configuration, an air holding chamber having good airtightness can be easily formed only by adjusting the size, position, material, and the like of the release layer. The invention according to claim 5 of the present invention is the motorcycle tire according to claim 4, wherein the tire includes a rubber layer that is a layer material provided at least at a portion that finally forms a ground contact surface of the tire, and a plurality of other tires. Equipped with a plurality of carcass as a layer material and a plurality of bead wires, a release layer is interposed between the plurality of carcass, and air is injected by injecting air between the carcass having the release layer interposed. A chamber can be formed.

According to this configuration, since the entire surface of the air holding chamber is formed by the carcass, even when air is injected into the air holding chamber, only a part of the air holding chamber does not greatly expand, and the air holding chamber does not greatly expand. Can be configured in a stable shape, and the work of mounting the air injection valve can be easily performed. According to a sixth aspect of the present invention, in the motorcycle tire according to the fifth aspect, the release layer is attached to a carcass on an outer peripheral side forming an air holding chamber.

According to this configuration, the use of a release layer having an airtight function can improve the airtightness of the carcass on the outer peripheral side. According to a seventh aspect of the present invention, in the motorcycle tire according to the fifth aspect, the release layer is attached to a rim-side carcass forming an air holding chamber.

According to this configuration, since the strength of the carcass side disposed closer to the rim is increased by the release material, the carcass closer to the rim is sandwiched between the obstacle on the road surface and the flange portion of the rim. Puncture (so-called rim striking puncture) can be reduced. The invention according to claim 8 of the present invention is the motorcycle tire according to any one of claims 5 to 7, wherein a rubber layer is also provided on a carcass disposed near the rim.

According to this configuration, the rubber layer provided on the carcass closer to the rim can improve the airtightness on the carcass side, or can protect the carcass and improve the reliability. The invention according to a ninth aspect of the present invention is the motorcycle tire according to the fourth aspect, wherein the tire includes a rubber layer, which is a layer material provided at least at a portion forming a ground contact surface of the tire, and another layer material. And a layer material for air retention, which is another layer material, a plurality of bead wires, and a release layer, and the layer material for air retention is formed of a material suitable for being along the rim. The layer is interposed between the carcass and the air holding layer material, and air is injected between the carcass where the release layer is interposed and the air holding layer material, so that the air holding layer material is on the rim. The air holding chamber can be formed along the posture.

According to this structure, since the air holding chamber is formed by the carcass and the air holding layer material, the air holding chamber is stably held in the posture along the rim. can do. According to a tenth aspect of the present invention, in the motorcycle tire according to the ninth aspect, the release layer is attached to a carcass forming an air holding chamber.

According to this structure, the airtightness of the carcass can be improved by using a material having an airtight function as the release layer. The invention according to claim 11 of the present invention provides:
In the motorcycle tire according to the ninth aspect, the release layer is attached to an air holding layer material forming an air holding chamber.

According to this configuration, since the strength of the air holding layer material is increased by the release material, the puncture generated when the air holding layer material is sandwiched between the obstacle on the road surface and the flange portion of the rim. (So-called rim punching) can be reduced. The invention according to claim 12 of the present invention relates to the motorcycle tire according to any one of claims 9 to 11,
The air-retaining layer material is also provided with a rubber layer.

According to this construction, the air-tightness of the air-retaining layer is increased by the rubber layer provided on the air-retaining layer, or the reliability is improved by protecting the air-retaining layer. can do. Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a motorcycle tire (hereinafter abbreviated as “tire”) 1 according to the present invention includes a tire 1
A first rubber layer 2 provided as a layer material that is provided at a location forming an outer peripheral surface of the carcass and forms a grounding surface, three layers of carcass 3A, 3B, 3C each serving as a layer material, and two bead wires 4. In addition, a release material 5 as a release layer is interposed between the inner carcass 3A and the intermediate carcass 3B. Then, the carcass 3B to which the release material 5 is attached
The air holding chamber 6 is formed by injecting air between the carcass 3A and the carcass 3A facing the release material 5, and a second rubber layer 7 is provided inside the carcass 3A on the inner periphery.

Here, as the release material 5, a release material such as a fluororesin, a silicone resin, or a polypropylene resin may be used. However, the release material is not limited thereto, and an inert material having a high release effect may be used. A material having an airtight function or a reinforcing function may be used. Further, the thickness of the release material 5 is desirably formed thinner than the carcass 3A, 3B, 3C and does not hinder the expansion and contraction of the carcass 3B. It is preferable to use a metal wire, a fiber, or the like as the bead wire 4, and as the three-layer carcass 3A, 3B, 3C,
It is preferable to use synthetic fibers such as nylon or natural fibers such as cotton impregnated with an adhesive and covered with rubber, but this is not limitative. Further, as shown by the phantom line in FIG. 1, an air injection valve 8 is provided at an appropriate place through the carcass 3A and the second rubber layer 7.

Next, a method of manufacturing the tire 1 is shown in FIG.
A description will be given based on (a) to (d) and FIGS. 3 (a) to (d). First, as shown in FIG. 2A, two annular bead wires 4 are arranged at a predetermined interval, and an annular carcass 3 is placed on these bead wires 4. In this case, the width of the carcass 3 is about three times the distance between the bead wires 4. Next, as shown in FIG. 2 (b), the carcass 3 is folded back at one bead wire 4. Then, only one side (FIG. 2)
The release material 5 to which the adhesive 9 has been applied is attached to the upper surface only in (c) (see FIG. 2C). As shown in the figure, a material having a width smaller than the dimension between the folded carcass 3 and the bead wire 4 is used as the release material 5.

Thereafter, as shown in FIG. 2D, the other carcass 3 is folded back at the other bead wire 4 and overlapped with the peeling material 5. Next, as shown in FIGS. 3A and 3B, a first rubber layer 2 forming the outer peripheral surface of the tire 1 is disposed on the upper carcass 3, and a second rubber layer is disposed on the lower carcass 3. Layer 7 is arranged. And finally,
The tire 1 is put into a mold (not shown) and vulcanized (see FIG. 3C).

Thus, the three-layer carcass 3A, 3B,
3C is formed. Also, the inner carcass 3A and the intermediate carcass 3B are fused except for the portion where the release material 5 is provided, and the intermediate carcass 3B and the outer carcass 3C are fused almost entirely. You. The outer carcass 3C and the first rubber layer 2 are fused and integrated, and the inner carcass 3A and the second rubber layer 7 are fused and integrated.

An air injection valve 8 is attached to the tire 1 thus formed, and air is injected from the air injection valve 8 when the tire is used, as shown in FIG. 3D. As described above, the carcass 3B of the intermediate layer to which the release material 5 is attached and the carcass 3 of the inner periphery facing the release material 5
The air is held between the air-conditioner A and the air-holding chamber 6.

According to this method, in the laminating step of the tire 1 before vulcanization molding, the release material 5 is applied to the carcass 3A, 3A.
Since it is only necessary to interpose between B and B, as in the case of manufacturing a motorcycle tire as shown in FIG. It is not necessary to perform the process, and an increase in labor and time during manufacturing can be minimized. In addition, since the carcasses 3A and 3B are fused to each other by vulcanization molding, these carcass 3A and 3B are satisfactorily and integrally joined at a place where the release material 5 is not provided, and the reliability for airtightness is also improved. improves. Also, the release material 5
By simply adjusting the size, position, material and the like of the carcass 3A, 3B, the adhesion area between the carcasses 3A and 3B and the position and size of the airtight space of the air holding chamber 6 can be easily changed.

Furthermore, since the entire surface of the air holding chamber 6 is formed by being surrounded by the carcass 3A, 3B having the same expansion and contraction performance, even when air is injected into the air holding chamber 6, only a part thereof is formed. Without swelling greatly,
The air holding chamber 6 can be configured in a stable shape,
Even if the tire 1 is greatly deformed by receiving a lateral load, or the rim or the spoke is deformed, the airtightness in the tire 1 can be maintained satisfactorily. Further, the carcass 3A is provided at a position where the air injection valve 8 is mounted, and the carcass 3A is easily held, so that the mounting operation of the air injection valve 8 can be easily performed.

As described above, the carcass 3 of the intermediate layer
By using a release material 5 having an airtight function and a reinforcing function for B, the airtightness on the outer peripheral side of the tire 1 can be improved,
Or the durability of the device. Alternatively, as shown in FIG. 4, the peeling material 5 may be attached not to the carcass 3B of the intermediate layer but to the carcass 3A of the inner periphery, instead of the carcass 3B of the intermediate layer. Carcass 3A
Side) and the durability can be improved. In this case, in particular, since the strength of the carcass 3A side is increased by the release material, a puncture (so-called rim striking puncture) occurs when the carcass 3A close to the rim is sandwiched between an obstacle on the road surface and the flange portion of the rim. Can be reduced.

Further, the second rubber layer 7 is formed on the inner carcass 3A.
Is provided, it is possible to enhance the airtightness of the inner carcass 3A side, to protect the carcass 3A and to enhance the reliability, and to omit the protective rim flap conventionally provided. it can. In addition, since the second rubber layer 7 is vulcanized and formed in contact with the carcass 3A, the second rubber layer 7 is preferably formed with a uniform thickness without flowing to an uneven position during the vulcanization molding. The second rubber layer 7 can be omitted by making the thickness of the rubber film of the carcass 3 itself thicker.

In the above embodiment, the case where two layers of the carcass 3B and 3C on the outer peripheral side of the tire 1 and one layer of the carcass 3A on the inner peripheral side of the tire 1 are provided is described. Instead, one or three or more carcass 3 on the outer peripheral side of the tire 1 may be provided, or two or more carcass 3 on the inner peripheral side of the tire 1 may be provided. Also, instead of interposing the release material 5 between the carcass 3A, 3B,
The release material 5 can be interposed between the carcass 3A and the second rubber layer 7 (not shown).

Further, as shown in FIGS. 5 (a) to 5 (d), the air holding layer material 10 is laminated on the inner peripheral side of the carcass 3 of the tire 1 via the release material 5 and vulcanized. After vulcanization molding, air may be formed between the carcass 3 on which the release material 5 is interposed and the air holding layer material 10 to form the air holding chamber 6. In this case, if a material such as a plain woven fabric having higher elasticity than the carcass 3 is used as the air holding layer material 10, the fitting property to the rim is improved, and the dimensional accuracy of the release material 5 does not have to be strict. Also, the air in the air holding chamber 6 can be satisfactorily held in a posture along the rim. And since the air holding layer material 10 is hard to be torn, even if the tire 1 is greatly deformed by receiving a lateral load or the rim or the spoke is deformed, the airtightness in the tire 1 can be maintained satisfactorily. Further, since the holding material 10 for air is easy to hold, the valve 8 for air injection is used.
Can be easily carried out.

In this case, too, the carcass 3
In addition, by using the release material 5 having an airtight function and a reinforcing function, the airtightness on the outer peripheral side of the tire 1 can be enhanced, and the durability of the tire 1 can be enhanced. Instead, the air-tightness of the air-retaining layer material 10 can be improved or the durability can be improved by attaching the air-retaining layer material 10 to the air-retaining layer material 10 side. Also in this case, since the strength of the air holding layer material 10 is increased by the release material 5, rim punching can be reduced.
In addition, the second rubber layer 7 can be omitted by forming the air holding layer material 10 to be thicker.

Further, as shown in FIG. 6, a liquid or a gas can be used for the release layer in addition to the above-mentioned materials. In the above embodiment, the tire 1
The case where the entire outer surface of the tire is covered with the first rubber layer 2 has been described. However, the present invention is not limited to this, and it is also applicable to a case where only the portion forming the ground contact surface of the tire 1 is covered with the first rubber layer 2. Not even.

[0038]

As described above, according to the present invention, a release layer is interposed between layer materials of a tire composed of a plurality of layers, and air is injected between the layer materials having the release layer interposed. By manufacturing a tire for a motorcycle that can form an air holding chamber, it is possible to minimize the increase in labor and time required for manufacturing, improve work efficiency, and increase the size of the release layer and the like. An air holding chamber having good airtightness and an airtight space can be easily formed only by adjusting the position, the material, and the like.

Further, by interposing the peeling layer between the carcass, the air holding chamber can be formed in a stable shape, and the reliability is improved. In addition, by interposing a release layer between the air holding layer material and the carcass made of a material suitable for the rim, the fitting property to the rim is improved, and the dimensional accuracy of the release material is strict. Even if it is not, the air in the air holding chamber can be satisfactorily held in a posture along the rim.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a motorcycle tire according to an embodiment of the present invention.

2 (a) to 2 (d) are cross-sectional views each showing a manufacturing process of the tire for a motorcycle.

3 (a) to 3 (d) are cross-sectional views each showing a manufacturing process of the tire for a motorcycle.

FIG. 4 is a cross-sectional view of a motorcycle tire according to another embodiment of the present invention.

FIG. 5 is a sectional view of a motorcycle tire according to another embodiment of the present invention.

FIG. 6 is a sectional view of a motorcycle tire according to another embodiment of the present invention.

7 (a) to 7 (d) are cross-sectional views showing steps of manufacturing a conventional tire.

FIG. 8 is a sectional view of a conventional motorcycle tire.

FIG. 9 is a cross-sectional view of a conventional motorcycle tire.

[Explanation of symbols]

 Reference Signs List 1 motorcycle tire 2 first rubber layer (layer material) 3, 3A, 3B, 3C carcass (layer material) 4 bead wire 5 release material (release layer) 6 air holding chamber 7 second rubber layer 8 air injection valve 10 air Layer material for holding (layer material)

Continued on the front page (72) Inventor Yoshihide Miyaji 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 4F212 AH20 VA02 VA04 VC02 VC14 VC32 VK03 VL27

Claims (12)

[Claims] 1. A motorcycle for forming an air holding chamber by interposing a release layer between layer materials of a tire composed of a plurality of layers and injecting air between the layer materials having the release layer interposed. Tire manufacturing method. 2. The tire according to claim 1, further comprising a rubber layer as a layer material provided at least at a portion forming a ground contact surface of the tire, a plurality of carcass as a plurality of other layer materials, a plurality of bead wires, Before vulcanization molding, a release layer for preventing the carcass from welding during vulcanization molding is interposed between the carcass, and after vulcanization molding, a release layer is interposed. The method for manufacturing a tire for a motorcycle according to claim 1, wherein the air holding chamber is formed by injecting air between the carcass. 3. The tire has a rubber layer as a layer material, a carcass as another layer material, and an air-retaining layer as another layer material, which are provided at least at a portion forming a ground contact surface of the tire. Material, a plurality of bead wires, and a release layer, vulcanization molding with a release layer interposed between the carcass and the air holding layer material, after vulcanization molding, the release layer The method for manufacturing a motorcycle tire according to claim 1, wherein the air holding chamber is formed by injecting air between the interposed carcass and the air holding layer material. 4. A tire comprising a plurality of layers, wherein
A two-wheeled motor vehicle tire provided with a release layer that allows formation of an air holding chamber by separating layers from each other and injecting air between the layers. 5. The tire includes a rubber layer, which is a layer material provided at least at a portion forming a ground contact surface of the tire, a plurality of carcass, which are other plurality of layer materials, and a plurality of bead wires. The motorcycle tire according to claim 4, wherein a release layer is interposed between the plurality of carcasses, and an air holding chamber can be formed by injecting air between the carcass having the release layer interposed. 6. The motorcycle tire according to claim 5, wherein the release layer is attached to a carcass on an outer peripheral side forming the air holding chamber. 7. The motorcycle tire according to claim 5, wherein the release layer is attached to a carcass near the rim forming the air holding chamber. 8. The motorcycle tire according to claim 5, wherein a rubber layer is also provided on the carcass disposed near the rim. 9. The tire has a rubber layer as a layer material, a carcass as another layer material, and an air holding layer as another layer material, which are provided at least at a portion forming a ground contact surface of the tire. Material, a plurality of bead wires, and a release layer, wherein the air retention layer material is made of a material suitable for following the rim, and the release layer is interposed between the carcass and the air retention layer material. The air holding chamber can be formed in such a manner that the air holding layer material is formed along the rim by injecting air between the carcass on which the release layer is interposed and the air holding layer material.
The motorcycle tire of the description. 10. The motorcycle tire according to claim 9, wherein the release layer is attached to a carcass forming an air holding chamber. 11. The motorcycle tire according to claim 9, wherein the release layer is attached to an air holding layer material forming an air holding chamber. 12. The motorcycle tire according to claim 9, wherein a rubber layer is also provided on the air-retaining layer material.