Patent ID: 8534334

Claim:
A tire comprising a rib-shaped land portion extending along a tire circumferential direction, which is adjacent to a circumferential groove extending along the tire circumferential direction, wherein an air chamber having a recessed portion recessed toward an inside in the tire radial direction and a constriction groove communicating to the air chamber and the circumferential groove are provided on the rib-shaped land portion, the recessed portion includes a portion having a depth where a grounding surface on which the rib-shaped land portion grounds a road surface as a reference is deeper at one end of the air chamber in the tire circumferential direction than at the other end of the air chamber, a height from a bottom surface of the recessed portion to the grounding surface changes along the tire circumferential direction, a volume of a space formed by the constriction groove and the road surface is smaller than a volume of a space formed by the recessed portion and the road surface, the constriction groove includes; an outer groove communicating to the circumferential groove, and extending to the other end, an inner groove communicating to the outer groove, extending to the one end, and communicating to a closed spaced formed by the air chamber and the road surface, the inner groove is formed between the recessed portion and a grounding surface where the rib-shaped land portion is grounded with the road surface, and the inner groove includes a portion deeper than a depth of the recessed portion, in a cross sectional view of the tire along a tread width direction.