| 摘要 |
PROBLEM TO BE SOLVED: To simultaneously achieve desired anti-hydroplaning performance, braking performance and abrasion-proof performance.SOLUTION: A plurality of sipes 4 is formed in at least one rib 3 obtained by providing a plurality of main grooves 2 extended along a circumferential direction on a tread face. Each sipe 4 is constituted to be closed when contacting the ground. The rib 3 is formed to make a corner into an R-shape. A lateral sipe density LSD of the sipe 4 formed on the tread face 1, and an R dimension RL of the R-shape formed in the rib 3, are brought into values satisfying a following expression: 0.01<(LSD+0.006)×L<0.07. |
