| 摘要 |
<p>PROBLEM TO BE SOLVED: To effectively suppress generation of uneven wear mainly of shoulder wear, by providing a plurality of main grooves extended in the tire peripheral direction in a tread, forming a plurality of ribs by the main groove, and the more going to a shoulder side, the more increasing a tilt angle in a side surface of the rib. SOLUTION: A plurality of main grooves 6 extended in a tire peripheral direction are provided in a tread part 4, ribs 7a, 7b, 7c are formed to be divided by these main grooves 6 from a center side with a tire equator line CL serving as the center to a shoulder side. A depth of each main groove 6 is almost equal, when respectiveα1 toα3 are assumed for tilt angle in a center side surface of the ribs 7a to 7c, a relation ofα3 >α2 >α1 is satisfied, and when respectiveβ1 ,β2 are assumed for tilt angle in a shoulder side surface of the ribs 7a, 7b, a relation ofβ2 >β1 is satisfied. Since a burden against lateral force is reduced as going to a shoulder side by increasing rigidity of the rib higher as going to the shoulder side, generation of uneven wear is suppressed.</p> |
