Importance

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Abstract

A block has a first wall surface formed from a position where a lateral groove is opened to a first circumferential groove toward an upstream side of an air flow, a second wall surface formed from a position where the lateral groove is opened to a second circumferential groove toward the upstream side of the air flow, and a block corner portion formed at a position where the lateral groove is opened to the second circumferential groove. A virtual surface obtained by extending the second wall surface on the upstream side intersects with the block corner portion on a downstream side or passes through a position in the second circumferential groove which is apart from the block corner portion in a tire width direction. A groove width of the first circumferential groove gradually increases toward the downstream side of the air flow at the first wall surface.

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First Claim