| 摘要 |
PURPOSE:To improve partial wear resistance with good traction performance kept by making a groove wall inclination angle in a kicking-out side circumferential direction to the tire normal line of a block larger than a groove wall inclination angle in a facing gripping side circumferential direction. CONSTITUTION:Three main grooves 1 are disposed on the tread surface T of a tire in a tire width direction in parallel to each other in a tire circumferential direction at a prescribed interval. Besides, plural auxiliary grooves 2 are disposed in a direction crossing with the main groove 1, that is, the tire width direction, to form a number of blocks 3. Moreover, the tire rotational direction is designated in an arrowed direction, the upper part of the respective blocks 3 are made to be gripping sides 3A, and the lower parts kicking-out sides 3B. With this constitution, the inclination angle beta of the groove wall SB in the kicking-out side circumferential direction to the tire normal line O of the block 3 is set so as to be larger than the inclination angle alpha of the groove wall 3A in the facing gripping side circumferential direction. It is thus possible to improve partial wear resistance with good traction performance kept. |
