Energizing the mousse with nitrogen results in a 100% flat-proof alternative to tubes while maintaining a lively, consistent feel from the very first ride. Try easy-to-install Nitro Mousse, and enjoy long-lasting performance that will never let you down..<br> 100% flat-proof dependability.<br> Lasts up to twice as long as other popular mousses.<br> PSI Equivalent: 6-9 PSI.<br> Fits most tires sized: 90/100-21