Patent ID: 8297323
Filing Date: 2012-10-30
Classification: B60C

Abstract:
1. A pneumatic tire having: a circumferential groove continuously extending in the tire circumferential direction in a ground contact surface of a tread portion; and a resonator provided in a land portion and constituted of a resonance cell portion opened to a ground contact region at a position distanced from the circumferential groove and a siping portion for making the resonance cell portion communicate with the circumferential groove, characterized in that: an opening width of the siping portion at the ground contact surface of the tread portion is designed to change stepwise in the longitudinal direction thereof such that the opening width is relatively narrow on the side of the circumferential groove and relatively wide on the side of the resonance cell portion, and the resonance cell portion terminates in the land portion without communication with an another adjacent circumferential groove.