Patent ID: 6427737
Filing Date: 2002-08-06
Classification: B60C,Y10S

Abstract:
A pneumatic tire having a tread pattern, said tread pattern comprising:block-shaped land portions demarcated by a plurality of main grooves extending in a circumferential direction of the tire and by a plurality of lug grooves intersecting the main grooves; and at least four sipes provided in each block-shaped land portion, wherein each of the sipes has, at least on a tread surface, an amplitude in a direction orthogonal to a longitudinal direction of the sipe, each of the sipes including a first portion, a second portion and a third portion, the first portion being a portion of the sipe located on the tread surface side in a depthwise direction, the first portion extending straight in a direction orthogonal to the tread surface, the second portion being a portion of the sipe located on the sipe bottom side of the depthwise direction, the first portion and the second portion being disposed so as to be offset and separated from each other by a predetermined distance therebetween in a direction of sipe width, the first portion and the second portion being connected to each other by the third portion, the third portion extending in a direction which intersects a radial direction of the tire wherein two of said at least four sipes define a small block having a tread surface portion and a bottom portion, the width of the bottom portion being greater than the width of the tread surface portion.