US Patent 11186126 Tyre cavity noise absorber

A tyre cavity noise absorber comprising a body 1 of sound absorbing material with an outer protective cover 3. The body of sound absorbing material is intended to be mounted to a wheel 2 of a wheel and tyre 6 assembly so that a surface of the body is exposed in a tyre cavity of the wheel and tyre assembly. The outer protective cover only partially covers said surface of the body of sound absorbing material such that the cover protects the body of sound absorbing material from a bead 7 of a tyre as a tyre is fitted to, or removed from, the wheel and the uncovered parts of the body of sound absorbing material are free to absorb sound.