| 摘要 |
PURPOSE:To prevent the generation of a wandering phenomenon by providing an auxiliary groove with the specific groove width and inclination in the specific position of the shoulder rib of a tire as well as plural sipes at the land part outside the auxiliary groove. CONSTITUTION:In the tread part 1 of a tire, an auxiliary groove 4 is circumferentially provided at a shoulder rib 3 partitioned by a circumferential main groove 2. The auxiliary groove 4 is positioned in the distance S of approximately 20-80% between the tread part side end edge 7 and the shoulder rib width So, and the groove width W is made narrower than the groove width Wt of the main groove 2 as well as made to such an extent that groove walls are not brought in contact in the rolling of the tire. In addition, plural sipes 6 are provided at the land part 5 outside in the tire width direction from the auxiliary groove 4 with equal spaces in the peripheral direction. With this structure, the rigidity of the land part 5 is lowered, large camber thrust is generated by the crush in rolling as well as camber torque in the direction of climbing the inclined face raised on the side of small blocks partitioned by the sipes can be generated, so that the generation of a wandering phenomenon is controlled in an extremely effective way. |
