Invention Grant
US4031938A Pneumatic tire tread 失效
气动轮胎胎面

Pneumatic tire tread
Abstract:
Tire treads are made more resistant to "groove wear" without reducing adherence of the tread to wet or moist roads by providing specially located recesses and incisions in the critical zones formed by the salient angles and the reentrant angles of the broken-line circumferential ribs.
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