| 摘要 |
In order to suppress the uneven wear of the shoulder lands and the formation of cracks in the shoulder grooves, the groove wall surface (17a) on the shoulder land (19)-side of a shoulder groove (17) is configured as an inclined surface comprising a first inclined part (171), which is inclined towards the centerline of the tire at an inclination angle (?1) that is uniform in the circumferential direction of the tire, and a second inclined part (172) which is further inclined towards the centerline of the tire from the first inclined part (171), extends to the bottom (17b) of the shoulder groove (17), and forms an angle (a) relative to the first inclined part (171) which changes along the circumferential direction of the tire. Therein, the inclination angles of the first and second inclined parts (171, 172) are set such that if (D) represents the depth from the tire tread surface to the bottom of the shoulder groove (17), (d) represents the depth from the tire tread surface to the position of the interface between the first inclined part (171) and the second inclined part (172), (amax) represents the maximum value of the angle (a), and (amin) represents the minimum value of the angle (a), then the maximum value (amax) and the minimum value (amin) satisfy the formula (D-d)(tanamax - tanamin) = 2.5. |
