JP4808914B2 - Motorcycle rough terrain tire, and motorcycle rough terrain tire mounting method - Google Patents

Description

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【表２】

【００７８】
【表３】

【００７９】
【表４】

【００８０】
【表５】

【００８１】
【表６】

【００８２】
【表７】

【００８３】
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【００８４】
【表９】

試験の結果から、本発明の適用された試験種５，１０，１５，２０のタイヤは、硬い路面、及び柔かい路面が混在した状況で性能を発揮できることが分かる。
【００８５】
【発明の効果】
以上説明したように、本発明のモーターサイクルの不整地用タイヤ、及びモーターサイクルの不整地用タイヤ装着方法によれば、硬い路面、及び柔かい路面が混在した状況で性能を発揮することができる、という優れた効果を有する。
【図面の簡単な説明】
【図１】 一実施形態に係る前輪用の不整地用タイヤのトレッドの展開平面図である。
【図２】 一実施形態に係る前輪用の不整地用タイヤの回転軸に沿った断面図である。
【図３】 一実施形態に係る後輪用の不整地用タイヤのトレッドの展開平面図である。
【図４】 従来例に係る後輪用の不整地用タイヤのトレッドの展開平面図である。
【図５】 従来例に係る前輪用の不整地用タイヤのトレッドの展開平面図である。
【符号の説明】
１０Ｆ 不整地用タイヤ
１０Ｒ 不整地用タイヤ
１２ トレッド
１２ｃ センター域
１２ｓ ショルダー域
１２ｍ 中間域
１２Ｅ トレッド端
１４ ブロック[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motorcycle rough terrain tire and a motorcycle rough terrain tire mounting method.
[0002]
[Prior art]
Among the various characteristics of motorcycle irregular terrain tires, cornering characteristics (lateral grip characteristics) and traction characteristics, particularly on rough terrain, are very important required characteristics as well as braking characteristics.
[0003]
In particular, in racing tires used in motocross races and the like, cornering is performed at high speed, and therefore the quality of the lateral grip of the tire is a very important factor for the tire.
[0004]
In addition, the traction characteristics of how to effectively transmit the engine power of motorcycles that improve year by year to the road surface is also an important factor in racing tires.
[0005]
On the other hand, due to the characteristics of rough road surface conditions, motocross racing requires tires that can handle various road surface conditions such as dry roads, soft roads, and muddy grounds.
[0006]
By the way, in the conventional motorcycle tire that is assumed to be used on a hard road surface, (1) Increase the contact area and reduce the negative ratio to secure the grip, (2) Increase the proportion of running with the motorcycle tilted For this reason, improvement in cornering characteristics particularly in the shoulder region of the tire is required (see, for example, Non-Patent Document 1).
[0007]
In addition, in conventional motorcycle tires that are assumed to be used in muddy areas from soft road surfaces, (1) the pattern is based on the tire circumferential block row to emphasize traction, (2) mud removal The negative ratio is increased in order to ensure the performance, and the blocks are not arranged between the tire circumferential block rows (see, for example, Non-Patent Document 1).
[0008]
[Non-Patent Document 1]
M401 (Front) and M402 (Rear) described in the Bridgestone Motocross & Enduro Tire catalog created in May 2002
[0009]
[Problems to be solved by the invention]
For this reason, with hard road tires, sufficient edge pressure and mud repellency cannot be obtained from soft roads to muddy areas, resulting in insufficient grip characteristics and traction characteristics from soft roads to muddy areas. It was.
[0010]
On the other hand, tires for muddy roads from soft road surfaces have a problem that grip characteristics and traction characteristics on a hard road surface are insufficient because a sufficient ground contact area cannot be obtained on a hard road surface.
[0011]
Therefore, conventionally, different types of tires are used properly for a hard road surface, a soft road surface, and an intermediate road surface, and each tire has the following configuration and problems.
[0012]
That is, in a hard road tire, cornering characteristics are secured by making the number of blocks in the shoulder block area equal to or greater than the number of blocks in the center area. As a result, the number of blocks in the intermediate area was smaller than that in the center area and the shoulder area so that the total negative ratio would not be too small.
[0013]
On the other hand, tires for soft road surfaces tend to have the same number of blocks in the center area, the intermediate area, and the shoulder area in order to ensure traction characteristics and mud-peelability on soft road surfaces. As a result, a sufficient contact area in the shoulder region could not be secured, and cornering characteristics on a hard road surface were not sufficient.
[0014]
In the conventional method, for example, if the interval of the tire circumferential block row is increased and the negative is increased, the resistance to the lateral input decreases, the skidding on a hard road surface deteriorates, and the tire circumference is obtained in order to obtain the lateral resistance. When the blocks are arranged between the directional block rows, problems such as poor mud repellency occur, and there are only tires that have high performance only on either a hard road surface or a soft road surface.
[0015]
Therefore, in a motocross race in which hard road surface, soft road surface, and muddy ground are mixed, conventionally, either a hard road tire or a soft road tire must be used, and a hard road surface is used. There has been a demand for a tire that can exhibit its performance in a mixed state of soft and soft road surfaces.
[0016]
The present invention has been made to solve the above-described problem, and is equipped with a motorcycle for rough terrain that can exhibit performance in a mixed state of a hard road and a soft road, and a motorcycle for mounting on a rough terrain. It is an object to provide a method.
[0017]
[Means for Solving the Problems]
As a result of various studies on motorcycles used on rough terrain, the inventors have divided the functions of the tread parts from the characteristics of using the motorcycle at an angle, and the tires are located in the tread areas as follows. It was found that the performance in a wide range from a hard road surface to a soft road surface can be improved by performing the setting.
[0018]
First, the center area of the tread should give priority to the traction characteristic that transmits the power of the motorcycle to the road surface rather than the grip characteristic in the lateral direction.
[0019]
For the shoulder area, it is better to emphasize the grip characteristics in the lateral direction when cornering with the vehicle body tilted. In particular, on a hard road surface, the ratio of tilting the motorcycle increases, and the effect of the negative tread ratio also increases. In soft road surfaces and muddy areas, traveling with the vehicle body tilted is less in comparison with a hard road surface, and after the vehicle body is tilted, the vehicle body is often raised and traction is applied in many cases. Therefore, if the shoulder area emphasizes cornering on a hard road surface by reducing the negative ratio, the lap time in the race will be shortened.
[0020]
The intermediate area requires both the characteristics of the center area and the shoulder area, but the power of the center area cannot be applied, and the lateral grip characteristics of the shoulder area are not required.
[0021]
From the above, in the center area, the number of blocks is reduced in order to improve the traction performance to ensure traction and mud repellency, and in the shoulder area, the number of blocks is particularly frequently used on hard road surfaces. Increase the contact ratio to reduce the negative ratio and secure the grip characteristics in the lateral direction by increasing the contact area. Also, in the middle area, it has intermediate characteristics between the center area and the shoulder area, and the traction characteristics and grip characteristics It has been found that performance in a wide range from a hard road surface to a soft road surface can be improved by achieving both.
[0022]
In order to achieve the above object, an invention according to claim 1 is a motorcycle tire for rough terrain provided with a plurality of blocks on a tread surface, wherein a negative ratio of the tread is within a range of 65 to 97%. Each block has a projected length in the tire circumferential direction of 0.3% or more of the circumferential length on the tire equator plane, and a projected length in the tire width direction of 3.5% or more of the peripheral length of the tread. The two areas in the center when the tread surface is divided into 6 equal parts in the tire width direction are the center area, the two areas on both sides of the center area are the middle area, and the two outermost areas in the tread width direction are When the shoulder area is used, the number of blocks in the shoulder area> the number of blocks in the intermediate area > the number of blocks in the center area is satisfied.
[0023]
Next, the operation of the motorcycle for uneven terrain according to claim 1 will be described.
[0024]
In the motorcycle uneven terrain tire according to claim 1, the negative ratio of the tread is set within a range of 65 to 97%, and for each block, the projected length in the tire circumferential direction is the tire equatorial plane. 0.3% or more of the circumference of the tire and the projected length in the tire width direction are set to 3.5% or more of the peripheral length of the tread. Further, with respect to the number of blocks of the tread, the number of blocks in the shoulder region> the intermediate region By making the number of blocks> the number of blocks in the center area, the softness in the center area, traction on mud dredging, and mud repellency are secured, and in the shoulder area, the number of blocks is large, so the lateral direction due to increased contact area Grip characteristics are ensured and cornering performance on hard roads is improved, and in the middle area, it becomes an intermediate characteristic between the center area and the shoulder area. Ri, it is possible to demonstrate the performance in a mixed state of hard road surface and the soft road surface.
[0025]
In the center area, the number of blocks is small, but the groove area is large. Therefore, the size of each block can be increased and the rigidity can be set high, thereby improving the straight running performance on a hard road surface. It can be secured.
[0026]
Here, if the negative ratio of the tread is less than 65%, the effective ground contact area increases on a hard road surface, but conversely, the block ground pressure in the ground contact surface decreases and an effective edge effect cannot be obtained.
[0027]
On the other hand, if the negative ratio of the tread exceeds 97%, the minimum required ground contact area cannot be obtained, and the block becomes inevitably small, so that the block rigidity cannot be secured.
[0028]
Also, if the projected length of the block in the tire circumferential direction is less than 0.3% of the circumferential length of the tread on the tire equatorial plane, the block stiffness in the circumferential direction will be lowered, and the traction performance and braking performance will be significantly inferior. Become.
[0029]
On the other hand, when the projected length of the block in the tire width direction is less than 3.5% of the peripheral length of the tread, the block rigidity in the tire width direction is lowered and the lateral grip characteristics are remarkably deteriorated.
[0030]
In the present invention, the number of blocks is counted according to which region the center of gravity of the block ground plane is included.
[0031]
In addition, when the center of gravity of the ground contact surface of the block coincides with the line dividing the area (on the boundary line), the number is counted as 0.5 in both areas.
[0032]
The invention according to claim 2 is characterized in that, in the motorcycle for rough terrain of the motorcycle according to claim 1, the negative ratio is set in a range of 75 to 97%.
[0033]
Next, the operation of the motorcycle for rough terrain tire according to claim 2 will be described.
[0034]
When traveling on rough terrain, the straightness and handling characteristics of the front wheels are important. If it contacts more than necessary, it will be easy to receive the disturbance from a road surface, Therefore Compared with a rear wheel, a negative is large and a tread curvature tends to become small.
[0035]
From the above, if the negative ratio is in the range of 75 to 97%, when used for front wheels, the necessary ground contact area and block rigidity can be secured, and the deterioration of the straight running stability due to excessive ground contact area is prevented. I can do it.
[0036]
If the negative ratio of the tread is less than 75%, high performance can be obtained as compared with the conventional one, but the above-described action suitable as a front wheel cannot be obtained sufficiently.
[0037]
According to a third aspect of the present invention, the negative ratio is set within a range of 68 to 85%. In the motorcycle for rough terrain tire according to the first aspect, each block has a projected length in the tire circumferential direction. The tread is characterized by being set to 0.6% or more of the circumferential length on the tire equator plane and the projected length in the tire width direction to 7.0% or more of the peripheral length of the tread.
[0038]
Next, the operation of the motorcycle for rough terrain tire according to claim 3 will be described.
[0039]
When traveling on rough terrain, the traction characteristics of the rear wheels, which are drive wheels, are important in comparison with the front wheels.
[0040]
In the motorcycle uneven terrain tire according to claim 3, the negative ratio of the tread is 75 to 97%, and the projected length in the tire circumferential direction of each block is 0.6 of the circumferential length of the tread on the tire equatorial plane. % Or more, and the projected length in the tire width direction is set to 7.0% or more of the tread peripheral length, so that high traction characteristics and lateral blip preferable as a rear wheel can be obtained, and engine power can be efficiently applied to the road surface. It is possible to communicate.
[0041]
When the negative ratio of the tread is less than 75%, when the projected length in the tire circumferential direction of the block is less than 0.6% of the circumferential length of the tread on the tire equatorial plane, and when the tire width of the block is When the projected length in the direction is less than 7.0% of the peripheral length of the tread, high performance can be obtained as compared with the conventional one, but the above-described action suitable as a rear wheel cannot be obtained sufficiently.
[0042]
The method for mounting a motorcycle rough terrain tire according to claim 4 is characterized in that the motorcycle rough terrain tire according to claim 2 is used as a front wheel of the motorcycle, and the motorcycle rough terrain tire according to claim 3. Is used for the rear wheel of the motorcycle.
[0043]
Next, the operation of the motorcycle mounting method for rough terrain according to claim 4 will be described.
[0044]
The operation when the motorcycle for rough terrain tire according to claim 2 is used for the front wheel of the motorcycle is as described above, and the motorcycle for rough terrain tire according to claim 3 is used as the rear wheel of the motorcycle. The action when used for is as described above.
[0045]
By using motorcycle terrain tires on the front and rear wheels of the motorcycle in this way, the performance of the motorcycle can be maximized and the performance in a wide range from a hard road surface to a soft road surface can be improved. .
[0046]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a motorcycle for rough terrain according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
[0047]
FIG. 1 is a development view of the tread 12 of the rough terrain tire 10F used for the front wheel of the motorcycle, and FIG. 2 is a development view of the tread 12 of the rough terrain tire 10R used for the rear wheel.
(Tire for rough terrain for front wheels)
First, the rough terrain tire 10F used for the front wheels will be described.
[0048]
As shown in FIG. 1, a plurality of blocks 14 are formed on the tread 12 of the rough terrain tire 10F.
[0049]
Each block 14 has a projected length Ls in the tire circumferential direction of 0.3% or more of the circumferential length of the tread 12 on the tire equatorial plane CL, and a projected length Lw in the tire width direction of 3 of the peripheral length Wp of the tread 12. It is necessary to set it to 5% or more.
[0050]
As shown in FIG. 2, the peripheral length Wp of the tread 12 means that the tread 12 has a tread edge 12E (outermost in the tire width direction) when the tread 12 is viewed in a cross section along the rotation axis. This is the length measured along the tread surface from the outermost end of the block in the tire width direction) to the other tread end 12E.
[0051]
As shown in FIG. 1, the tread 12 is unfolded into a flat shape, and the tread 12 tread 12 (the region from one tread end 12E to the other tread end 12E) is divided into six equal parts in the width direction. two areas center region 12c, the two regions on either side of the center area 12c intermediate region 12m, two regions of the tread width direction outermost when the shoulder area 12s of the number of blocks in the shoulder region 12s> intermediate region It is necessary to satisfy the relationship of the number of blocks of 12 m> the number of blocks of the center area 12c .
[0052]
In FIG. 1, 14c indicates a block in the center area 12c, 14m indicates a block in the intermediate area 12m, and 14s indicates a block in the shoulder area 12s.
[0053]
Furthermore, the negative ratio of the tread 12 (the average value of the entire tread 12) needs to be set in the range of 65 to 97%, and is preferably set in the range of 75 to 97% for the front wheels.
[0054]
Further, in the case of the front wheel, the negative ratio of the tread 12 is preferably set to 85 to 97% in the center region 12c, 80 to 95% in the middle region 12m, and 75 to 90% in the shoulder region 12s.
[0055]
2, the tread width measured along the rotation axis of the tread 12 is Tw, the tire equatorial plane position P1 on the tread 12 tread edge 12E (the tire width direction of the outermost block in the tire width direction) When the distance measured along the tire radial direction (outermost end) is defined as H and H / Tw is defined as the Tr curvature ratio, the Tr curvature ratio should be set within a range of 0.20 to 0.50. Is preferable, and among these, it is more preferable to set within the range of 0.23 to 0.45.
(Rough tires for rear wheels)
Next, the rough terrain tire 10R used for the rear wheel will be described.
[0056]
As shown in FIG. 3, a plurality of blocks 14 are formed on the tread 12 of the rough terrain tire 10R.
[0057]
Each block 14 has a projected length Ls in the tire circumferential direction of 0.3% or more of the circumferential length of the tread 12 on the tire equatorial plane CL, and a projected length Lw in the tire width direction of 3 of the peripheral length Wp of the tread 12. The rear wheel block 14 preferably has a projection length Ls in the tire circumferential direction and a projection length Lw in the tire width direction that is greater than that of the front wheel block 14. The projected length Ls in the tire circumferential direction is set to 0.6% or more of the circumferential length of the tread 12 on the tire equatorial plane CL, and the projected length Lw in the tire width direction is set to 7 of the peripheral length Wp of the tread 12. It is preferable to set it to 0% or more.
[0058]
The number of blocks of the tread 12 needs to satisfy the relationship of the number of blocks in the shoulder region 12s> the number of blocks in the intermediate region 12m> the number of blocks in the center region 12c , like the front-wheel rough terrain tire 10F.
[0059]
Further, the negative ratio of the tread 12 (average value of the tread 12) needs to be set within a range of 65 to 97%, and preferably, the negative ratio is set smaller than the front-wheel rough terrain tire 10F. The negative ratio is preferably set in the range of 68 to 85%.
[0060]
Further, in the case of the rear wheel, the negative ratio of the tread 12 is preferably set to 75 to 85% in the center region 12c, 72 to 82% in the middle region 12m, and 68 to 79% in the shoulder region 12s.
[0061]
The Tr curvature ratio of the rear wheel rough terrain tire 10R is also preferably set within a range of 0.20 to 0.50, and more preferably within a range of 0.23 to 0.45. Further preferred.
[0062]
The front wheel rough terrain tire 10F and the rear wheel rough terrain tire 10R may be so-called bias tires or radial tires, but radial tires are preferred.
[0063]
With radial tires, the tire mass can be reduced due to the characteristics of the tire structure. As a result, it is advantageous in handling ease and reduction of unsprung load.
(Function)
In the rough terrain tire 10F and the rough terrain tire 10R of the present embodiment, the negative ratio of the tread 12 is set within a range of 65 to 97%, and the dimensions of each block 14 are projected in the tire circumferential direction. The length Ls is set to 0.3% or more of the circumferential length of the tread 12 on the tire equatorial plane CL, the projection length Lw in the tire width direction is set to 3.5% or more of the peripheral length Wp of the tread 12, As for the number of blocks of the tread 12, since the number of blocks in the shoulder area 12s> the number of blocks in the intermediate area 12m> the number of blocks in the center area 12c, the center area 12c has traction and mud removal properties from a soft road surface to a muddy area. In the shoulder area 12s, because of the large number of blocks, the grip area in the lateral direction on the hard road surface is secured by increasing the contact area. In-band 12m, become intermediate characteristic between the center region 2c and the shoulder region 21s, hard road and soft road mixed road surface condition of, for example, it is possible to improve the performance in the course for motocross.
[0064]
If the negative ratio of the tread 12 is less than 65% in the rough terrain tire 10F and the rough terrain tire 10R, the effective ground contact area increases on a hard road surface, but conversely the block ground pressure in the ground contact surface is small. Thus, an effective edge effect cannot be obtained on a soft road surface.
[0065]
On the other hand, in the rough terrain tire 10F and the rough terrain tire 10R, if the negative ratio of the tread 12 exceeds 97%, the minimum required contact area cannot be obtained, and the block becomes inevitably small. The rigidity cannot be secured.
[0066]
Further, in the rough terrain tire 10F and the rough terrain tire 10R, when the projected length Ls of the block 14 in the tire circumferential direction is less than 0.3% of the circumferential length of the tread 12 on the tire equator plane, The block rigidity is lowered, and the traction performance and the brake performance are remarkably deteriorated.
[0067]
On the other hand, in the rough terrain tire 10F and the rough terrain tire 10R, when the projected length Lw of the block 14 in the tire width direction is less than 3.5% of the peripheral length Wp of the tread 12, the block rigidity in the tire width direction is reduced. And the lateral grip characteristics are significantly inferior.
[0068]
Further, when the Tr curvature ratio is less than 0.20, as the motorcycle is tilted, the ground contact area becomes smaller, or the tire width becomes thicker than necessary, so that the handling characteristics deteriorate.
[0069]
On the other hand, if the Tr curvature ratio exceeds 0.50, the diameter difference between the tire equatorial plane and the shoulder becomes too large, the contact area becomes small, and a minimum grip cannot be obtained.
[0070]
In the present embodiment, in the front wheel rough terrain tire 10F, the negative ratio is larger than that of the rear wheel rough terrain tire 10R, and the value is set in the range of 75 to 97%. Straight running stability and handling performance can be obtained.
[0071]
Further, in this embodiment, in the rear wheel rough terrain tire 10R, the negative ratio is set to be smaller than that of the front wheel rough terrain tire 10F, and the value is set in the range of 68 to 85%, and the block 14 The projected length Ls in the tire circumferential direction is 0.6% or more of the circumferential length of the tread 12 on the tire equatorial plane CL, and the projected length Lw in the tire width direction is 7.0% or more of the peripheral length Wp of the tread 12 Therefore, high traction characteristics can be obtained on soft road surfaces and muddy areas, and engine power can be efficiently transmitted to the road surface by using the rear wheels.
[0072]
In the front terrain tire 10F, if the negative ratio of the tread 12 is less than 75%, high performance can be obtained as compared with the conventional one, but the above-described action suitable as a front wheel cannot be obtained sufficiently.
[0073]
Further, in the rear terrain tire 10R, when the negative ratio of the tread 12 is less than 75%, the projection length Ls in the tire circumferential direction of the block 14 is the circumferential length of the tread 12 on the tire equator plane CL. When the projected length Lw in the tire width direction of the block 14 is less than 7.0% of the peripheral length Wp of the tread 12, the performance higher than the conventional is Although obtained, the above-described action suitable as a rear wheel cannot be obtained sufficiently.
(Test example)
In order to confirm the effect of the present invention, tires of test examples to which the present invention was applied ( test types 5 , 10 , 15, 20 ), tires of comparative examples ( test types 1 to 4, 6 to 9, 11 to 14, 16 to 19 ) were prepared, and tests on traction, skidding, gap passage property, and mud repellency were performed on an actual vehicle equipped with a test tire.
[0074]
The test was performed on a hard road surface and a soft road surface (both rough terrain), and the evaluation was a 10-point scale evaluation by a test rider. The larger the value, the better the performance.
[0075]
The tire structure is as described below.
・ Comparison example bias structure rear wheel tires (test types 1 to 4) : 2 carcass plies of a bias structure made of nylon cord (cord crossing angle 30 °), 1 breaker made of nylon cord is doing. See Figure 4 for tread pattern. Note that reference numeral 100 in the figure indicates a block.
-Front wheel tire of bias structure of comparative example (test types 6 to 9) : having two carcass plies of a bias structure made of nylon cord (cord crossing angle 30 °) and having a breaker made of nylon cord ing. See Figure 5 for tread pattern. Note that reference numeral 100 in the figure indicates a block.
-Radial structure rear wheel tire of Example (Test type 15) : One radial carcass ply made of nylon cord and two belt plies made of aramid fiber cord. See Figure 3 for tread pattern.
-Radial structure front wheel tire of Example (Test type 20) : It has one radial structure carcass ply made of nylon cord and two belt plies made of aramid fiber cord. See Figure 1 for tread pattern.
-Radial structure rear wheel tire of comparative example (test types 11 to 14) : having one radial carcass ply made of nylon cord and two belt plies made of aramid fiber cord. See FIG. 4 for tread patterns of test types 11-13 . See FIG. 3 for the tread pattern of test species 14.
-Radial structure front wheel tire of comparative example ( test types 16 to 19) : It has one radial structure carcass ply made of nylon cord and two belt plies made of aramid fiber cord. See FIG. 5 for tread patterns of test types 16-18 . See FIG. 1 for the tread pattern of test species 19.
[0076]
[Table 1]

[0077]
[Table 2]

[0078]
[Table 3]

[0079]
[Table 4]

[0080]
[Table 5]

[0081]
[Table 6]

[0082]
[Table 7]

[0083]
[Table 8]

[0084]
[Table 9]

From the test results, it can be seen that the tires of test types 5 , 10 , 15 , and 20 to which the present invention is applied can exhibit performance in a situation where hard road surfaces and soft road surfaces are mixed.
[0085]
【The invention's effect】
As described above, according to the motorcycle rough terrain tire and the motorcycle rough terrain tire mounting method of the present invention, the performance can be exhibited in a situation where hard roads and soft roads are mixed. It has an excellent effect.
[Brief description of the drawings]
FIG. 1 is a development plan view of a tread of a rough terrain tire for a front wheel according to an embodiment.
FIG. 2 is a cross-sectional view along the rotation axis of a front-wheel terrain tire according to an embodiment.
FIG. 3 is a development plan view of a tread of a rough terrain tire for rear wheels according to an embodiment.
FIG. 4 is a developed plan view of a tread of a rough tire for rear wheels according to a conventional example.
FIG. 5 is a development plan view of a tread of a rough terrain tire for a front wheel according to a conventional example.
[Explanation of symbols]
10F Rough Terrain Tire 10R Rough Terrain Tire 12 Tread 12c Center Area 12s Shoulder Area 12m Middle Area 12E Tread End 14 Block

Claims (4)

A motorcycle terrain tire with a plurality of blocks on the tread surface,
The tread negative ratio is set within the range of 65-97%,
Each block is set such that the projected length in the tire circumferential direction is 0.3% or more of the circumferential length on the tire equatorial plane of the tread, and the projected length in the tire width direction is set to 3.5% or longer of the peripheral length of the tread. ,
When the tread surface is divided into 6 equal parts in the tire width direction, the central two areas are the center area, the two areas on both sides of the center area are the middle area, and the two outermost areas in the tread width direction are the shoulder areas. A motorcycle tire for rough terrain characterized by satisfying the number of blocks in the shoulder region> the number of blocks in the intermediate region > the number of blocks in the center region .   The tire for rough terrain of a motorcycle according to claim 1, wherein the negative ratio is set in a range of 75 to 97%. The negative ratio is set in the range of 68-85%,
Each block is set such that the projected length in the tire circumferential direction is 0.6% or more of the circumferential length on the tire equatorial plane of the tread, and the projected length in the tire width direction is set to 7.0% or more of the peripheral length of the tread. The tire for motorcycle rough terrain according to claim 1, wherein   A motorcycle using the motorcycle rough terrain tire according to claim 2 as a motorcycle front wheel, and the motorcycle rough terrain tire according to claim 3 as a motorcycle rear wheel. How to install tires for rough terrain.

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