| 摘要 |
PURPOSE:To provide a pneumatic radial tire preventing the different level abrasion of a shoulder part block while maximumly keeping braking and driving properties on ice roads based on a calf, and side-slip preventive performance with tire peripheral direction thin grooves. CONSTITUTION:A calf in a tire peripheral direction is provided on plural blocks formed on a tread surface at a depth of 50 or more % of that of a main groove 2. A thin groove 6, extending in a tire peripheral direction, is formed on a shoulder block 4a at a depth of 30-40% of that of the main groove 2. The calf 5 crosses the groove bottom of the thin groove 6 without bottom-boosting at a part for crossing the thin groove 6. |
