American Suspension Race series fork legs use the proprietary MOS2X coating. MOS2X eliminates stiction and creates the least friction imaginable for the fork bushing to ride on. This space-age coating makes small bumps in the road seem to disappear. MOS2X is a surface engineering tribological coating used on Aircraft aluminum in specialized racing vehicles to reduce friction and ensure a long life. It also includes fender and brake mount upgrades for the 23-32 inch fenders and larger rotor/calipers. *Street or track, nothing beats MOS2X.