| 摘要 |
An end of a block (18) formed on the tread surface is chambered with a chamfering curvature increasing toward the end to thereby uniform a contact pressure which otherwise locally increases at the end of the block (18) and enhance a driving stability; especially, a changing curvature can control a contact pressure to accommodate contact pressure distribution changes. Accordingly, a contact pressure can be further uniformed to increase a driving stability.
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