Made from a multi-cellular butyl material, it replaces conventional tubes, providing a pressure equivalent of approximately 13 psi. Specifically designed for offroad competition use at speeds up to 80 mph, above this speed can cause heat build up and can lead to rapid destruction of the Bib Mousse, resulting in serious injury to the rider Under no circumstances should Bib Mousse be fitted to motorcycles for on road use May be only used with Michelin offroad tires-use with other brands of tires can lead to handling instability and possible destruction Includes a tube of Bib Mousse fitting gel and installation instructions For Starcross HP4 tires only Fits 90/100-21 and 90/90-21 tire sizes