Patent ID: 8028796

Claim:
An assembly of a tire and a rim, comprising: a sound absorbing member provided on the tire inner cavity side of the assembly, the sound absorbing member forming a sound absorbing layer for suppressing cavity resonance inside the tire, wherein: the sound absorbing member is constituted of unwoven cloth made of plural fibers; and provided that density of a gas with which a tire is charged is p a , primary natural angular frequency of cavity resonance of the gas charged in the tire inner cavity of the assembly of the tire and the rim with no load exerted thereon is ω, viscosity coefficient of the charged gas is η, and peripheral thickness δ of the charged gas around fibers of unwoven cloth is defined by a formula below, δ = 2 ⁢ η ω ⁢ ⁢ ρ a the average distance d between fibers is within the range of 0.50δ to 4.00δ.