| 摘要 |
PROBLEM TO BE SOLVED: To provide a tire in which occurrence of a crack occurring in bottom-up parts can be more surely suppressed.SOLUTION: A tire includes a tread part which comes in contact with the road surface and a shoulder part, grooves are provided in the tread part or the shoulder part, and bottom-up parts are formed in the grooves. In the grooves, a first groove bottom end part connected to one side groove wall and a groove bottom and a second groove bottom end part connected to the other side groove wall and the groove bottom are formed, and an upper surface part positioned in the tire radial direction outside of the bottom-up part includes a first upper surface end part connected to the one side groove wall and a second upper surface end part connected to the other side groove wall. The cross-sectional shape of the first groove bottom end part and the second groove bottom end part is formed in a curved line shape having a first curvature radius R1, the cross-sectional shape of at least one of the first upper surface end part and the second upper surface end part is formed in a curved line shape having a second curvature radius R2, and the first curvature radius R1 and the second curvature radius R2 satisfy the relationship of R1≤R2. |
