Patent ID: 8646499

Claim:
A pneumatic tire comprising: a plurality of blocks defined by circumferential-direction grooves extending substantially in the circumferential direction of the tire; a plurality of transverse grooves intersecting the circumferential-direction grooves, where the circumferential-direction grooves and the transverse grooves are all formed in a tread surface; and a plurality of sipes which have at least one pair of inclined surfaces in the depth direction of the block and divide each block are formed on a front side of the block, the inclined surfaces being inclined with respect to the depth direction, only the inclined surfaces of the plurality of sipes being provided with a plurality of pillar-like projections in the width direction of the inclined surfaces, wherein: the plurality of sipes are each formed by a single blade comprising a linear portion which is parallel to the depth direction and an inclined portion that is oriented at an angle with respect to the linear portion; a respective pillar-like projection of the plurality of pillar-like projections is disposed on each of the inclined surfaces of each sipe and an entire side peripheral surface of the respective pillar-like projection extends in the direction orthogonal to the pair of inclined surfaces, the respective pillar-like projection of each of the inclined surfaces constituting a pair of projections that oppose each other; each projection of the pair of projections mutually abuts to provide support when a longitudinal force is input to the tread surface so as to secure block stiffness; a total height of the pair of projections corresponds to a width of the sipe; and a total sectional area of the projections provided on the inclined surfaces of a respective sipe is set to 1.5 to 50% of the total area of the inclined surfaces of the respective sipe.