| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent the drifting phenomenon of a vehicle caused by a rain groove by improving the hardness of a tread rubber and the structure of the edge section of a peripheral groove based on the relation between the groove part structure of the rain groove and the structure of the peripheral groove of a tire. SOLUTION: The tread rubber of this pneumatic radial tire has the JIS spring A type hardness 63-75 deg.. Multiple peripheral grooves 03 are provided on a tread face, the cross sectional shape of the peripheral groove 03 has a planar or circular arc-shaped chamfer part 05 at a groove wall edge part 04, the chamfer depth (d) of the chamfer part 05 is set to 10-40% of the groove depth, and the bevel angleθis set to a range 30-60 deg..
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