Pirelli Motocross Mousse Set – 80/100-21 Front (X-21B2) & 110/90-19 Rear (X-19E1) Foam Inserts | Flat-Proof Off-Road Tire Inserts for MX Dirt Bikes | Medium Compound | NHS

Upgrade your motocross setup with genuine Pirelli Mousse foam inserts sized for the most common MX tire combination: 80/100-21 front and 110/90-19 rear. These medium-compound rubber foam mousses are engineered to replace conventional inner tubes, delivering puncture-proof reliability while maintaining a lively, consistent ride feel. Once installed, they simulate roughly 0.7 bar of pressure, providing excellent traction, agility, and side-wall support demanded in competitive Motocross environments.