| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pneumatic radial tire capable of sufficiently and evenly radiating the heating calorie inside blocks through sipes without generating anisotropy in rigidity of the blocks. Ž<P>SOLUTION: This pneumatic radial tire includes a tread pattern formed on a tread and comprising by zoning blocks 5 with circumferential grooves 2 extending in the tread circumferential direction and lateral grooves 3 crossing the circumferential grooves 2 and extending in the tread cross direction. The block 5 is formed with three sipes 6, which extend to form similar rectangular shapes with each other with an expansion plane view, concentrically with each other. Depth of each of the sipes 6 is formed to be deeper as the sipe is positioned more inside the block 5. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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