Patent ID: 7172001

Claim:
A pneumatic tire comprising a tread portion divided into blocks by tread grooves, said blocks being provided with a plurality of sipes, each of said sipes opened at a tread face and having a configuration on the tread face comprising a zigzag part and two straight line portions being parallel with the center line of the zigzag, wherein: a tread rubber of the tread portion is formed of short fiber mixed rubber comprising 1.5 to 25 parts by weight of short fibers in 100 parts by weight of rubber component, said sipes comprise a three dimensional sipe in which each wall surface forms bumps and dips whereby said short fibers are three dimensionally arranged, the zigzag part oscillating in the longitudinal direction of the sipe in the course from tread face to a certain depth so that said three dimensional sipe has wall surface made up of parallelograms at the zigzag part, and displacement amount (La) of the zigzag part in the longitudinal direction of the sipe is in a range of from 0.5 to 2.0 mm.