Patent ID: 7341083
Filing Date: 2008-03-11
Classification: B60C,Y10S

Abstract:
1. A pneumatic radial tire comprising: a wheel tread part being divided into a plurality of blocks and including at least one circumferential groove formed in a circumferential direction and a plurality of traverse grooves formed at proper intervals in a width direction so as to intersect the circumferential groove, wherein each of the plurality of blocks is provided with at least one sipe which intersects the circumferential direction, wherein a cut depth of the sipe changes in the width direction, wherein, the block is divided in the width direction into a shoulder side region and a center side region by a center line of the block, a ratio between a sipe sectional area S so that block rigidity is higher in an end of the center side region compared with that in an end of the shoulder side region, wherein the sipe is constituted of a one-end-open sipe formed by opening the shoulder side of the block and terminating the center side in the block, and wherein a width of an unopened part of the end of the center side region is 5 to 15% of a block width.