Patent ID: 8181683

Claim:
A pneumatic tire provided with a block in a tread surface, comprising: a plurality of upper surface sipes in the block, each of which has both ends terminated within an upper surface of the block, formed on the upper surface of the block and arranged in parallel so as to be spaced in a sipe width direction; and a wall surface sipe extending along a tire diametrical direction in a wall surface of the block positioned in a longitudinal direction of the upper surface sipes, and arranged between an adjacent pair of the upper surface sipes, wherein the block is provided with an upper layer portion arranged in an upper surface side, and with a lower layer portion made of a harder rubber than the upper layer portion and arranged in an inner side in the tire diametrical direction of the upper layer portion, a boundary face between the upper and the lower layer portions being at a depth position which is 45 to 55% of the depth of a main groove from the upper surface of the block, and wherein the number of the wall surface sipe is set more in the lower layer portion than in the upper layer portion.