Patent ID: 8439091

Claim:
A pneumatic tire comprising: a tread portion and a belt layer on an outer periphery of a carcass layer that extends between left and right bead portions and a plurality of circumferential main grooves extending in a tire circumferential direction provided on an outer surface of the tread portion, wherein on a tire cavity side surface of the tread portion, a ridge (Ra) protruding into the tire cavity side in a direction opposite to a tire radial direction is formed that extends in the tire circumferential direction in a position offset from a tire center towards a well side of a mounting rim so as to encompass an entire width of a well and an entire width of a circumferential main groove positioned farthest to a shoulder side; and an edge of the ridge (Ra) on the shoulder side in a tire width direction is positioned more towards the tire center than a point where a perpendicular line extending from an edge of a widest part of the belt layer intersects the carcass layer, and an edge of the ridge (Ra) on the tire center side extends to the tire center if there is no circumferential main groove provided on the tire center, and to a point on a side of the circumferential main groove on the tire center opposite to the well that is 15 mm removed from an edge of the circumferential main groove on the side opposite to the well if there is a circumferential main groove provided on the tire center.