Patent ID: 7992608

Claim:
A pneumatic tire, comprising: circumferential grooves disposed along a circumferential direction of a tread; and land portions divided by the circumferential grooves, wherein positions of groove deepest portions in the circumferential grooves vary in a predetermined cycle along the circumferential direction in a width direction of the tread within the circumferential grooves, wherein in the land portions, depth direction positions, where a groove bottom surface of the circumferential groove contacts with each of perpendicular lines which are perpendicular or approximately perpendicular to the tread surface, which passes respectively through each of a plurality of edges on a side of each of the circumferential grooves, vary in a radial direction in the predetermined cycle along the circumferential direction; angles, which are formed by the perpendicular lines and a section line of a cross-section of the groove bottom surface in the width direction of the tread surface with a vertex in the depth direction positions, vary in the predetermined cycle along the circumferential direction; a cross sectional shape of the circumferential groove varies in a stepwise manner along the circumferential direction of the tread.