Patent ID: 8136560

Claim:
A tire noise reduction device attached to a tire comprising: at least one noise absorbing member which is made of a porous material and attached to an inner surface of a tire tread portion, wherein the noise absorbing member includes a plurality of continuous grooves arranged side by side in a tire circumferential direction in an outer peripheral surface of the noise absorbing member, each of the continuous grooves has an areal groove bottom and extends from one side surface to an opposite side surface of the noise absorbing member in a tire width direction so that one side can be seen through the continuous groove from the opposite side, a groove edge-to-edge distance between each adjacent two of the continuous grooves in the tire circumferential direction is 2 mm to 40 mm, and a largest see-through cross-sectional area of each of the continuous grooves is 20 mm 2 to 100 mm 2 .