| 摘要 |
A pneumatic tire is provided with a pair of circumferential grooves ( 3 ) arranged in both sides of a tire equator (C), and a plurality of oblique grooves ( 4 ) having a steep decline portion ( 4 a) extending to an outer side in a tire axial direction at an angle (q 1 ) between 15 and 45 degree with respect to a tire circumferential direction from a position near the circumferential groove ( 3 ), in a tread surface ( 2 ). A land portion (B) surrounded by the circumferential groove ( 3 ) and the steep decline portion ( 4 a) has an acute corner portion ( 12 ) and an obtuse corner portion ( 13 ), each being formed between the circumferential groove ( 3 ) and the steep decline portion ( 4 a). An outer groove wall surface ( 6 ) of the circumferential groove ( 3 ) includes a gentle decline wall ( 6 a) in the tread surface side, and a steep decline wall ( 6 b) in the groove bottom side.
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