PNEUMATIC RADIAL TIRE

摘要

PROBLEM TO BE SOLVED: To prolong the removal life of a tire by delaying the progress of cupping partial wear generated by the local wear of a rib developed from step wear and river wear in a pneumatic radial tire with a rib pattern. SOLUTION: Closed sipes 22 extended inclining in the cross direction and circumferential direction of a tire are arranged at a shoulder rib 18 being spaced in the circumferential direction of the tire. When an erroded tip part of local wear developed from step wear and river wear reaches the sipe 22, wear energy is concentrated on a sipe edge 24 high in ground pressure and hard to slip so as to temporarily reduce wear in vicinity and to delay the progress of cupping partial wear.