Patent ID: 7347239

Claim:
A tire noise reducing system comprising a pneumatic tire with a hollow, a wheel rim on which the tire is mounted so that said hollow forms a closed cavity, and a noise damper disposed in the closed cavity, wherein the noise damper is formed by fixing a strip of a porous material to the inner surface of the tire, the noise damper has a volume in a range of from 0.4 to 20% of the volume of the cavity, the noise damper has a sectional shape substantially constant in the tire circumferential direction, and the pneumatic tire comprises a tread portion provided with tread grooves defining a tread pattern having a sea ratio of 20 to 35%, wherein said inner surface of the tire is provided with an annular smooth zone extending along the tire equator, and lateral zones in which small rib-like protrusions extending radially from the annular smooth zone are formed, said strip is fixed to the annular smooth zone, and wherein the axial width of the annular smooth zone is slightly wider than the axial width of the base of the strip fixed thereto.