MXZ is The Lightest Motocross Chain available on the market today. Made for the professional motocross racer, GB420MXZ is the next generation of motocross racing chains featuring RK’s new deeper gold sideplates. MXZ chains feature chromoly steel construction with seamless rollers and bushings, and oversized special alloy pins for added strength. Ideal for MX race application from 50-85 cc.