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.. 100% flat-proof dependability. Lasts up to twice as long as other popular mousses. PSI Equivalent: 6-9 PSI. Fits most tires sized: 110/100-18