| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire in which uneven wear resistance is improved and occurrence of a crack and a defect in a rib is suppressed.SOLUTION: In the pneumatic tire, a plurality of first sipes 31, provided at edges of center ribs 12A, intermediate ribs 12B and shoulder ribs 12C, are formed in a circumference direction, first narrow grooves 21 are formed at the center ribs 12A and the intermediate ribs 12B so as to join main grooves 11, and second narrow grooves 22 are formed so as to connect the first narrow grooves 21, where intervals Pgbetween the first narrow grooves 21 are 20 mm-60 mm, intervals Psbetween the first sipes 31 are 15%-45% of the intervals Pgbetween the first narrow grooves 21, ratios Wa/TDW of widths Wa of the center ribs 12A to an expansion width TDW of a tread part 1 are 0.08-0.18, ratios Wb/TDW of widths Wb of the intermediate ribs 12B to the expansion width are 0.08 to 0.18 and ratios Wc/Wa of widths Wc of the shoulder ribs 12C to the widths Wa of the center ribs 12A are 1.20-1.30. |
