| 摘要 |
PURPOSE:To prevent river wear effectively which is generated at both the peripheral edge parts of a rib which is interposed between longitudinal grooves during traveling. CONSTITUTION:Plural sipes 5 which cross in a tire width direction between longitudinal grooves 3, 3 adjacent to each other and divide to block ribs 4 are formed on the circumference of the ribs 4 at intervals. The sipe 5 is formed with w/p >=1.8, and t<=0.1h, where the rib width is (w), the interval of the sipes is (p), the groove width of the sipe is (t), the average depth of the sipes is (h). Moreover, the average depth (h) of the sipe is made 50% or more of the depth H of the longitudinal groove, and the block 6 of the rib 4 which is blocked by the sipes 5 is constituted of blocks 6a constituting the reference surface of the tire and protruding blocks 6b which protrude from the surface of the blocks 6a at even intervals. |
