RK 420Mxz4 Supercross Chain RKs Mxz4 chains are engineered for the rigorous demands of Supercross and Motocross racing, with a durable chromoly steel construction complemented by seamless rollers and bushings. Designed to withstand the shock loads from extreme jumps, these chains feature Chromized pins that significantly enhance wear resistance, offering more than double the longevity of standard non-sealed chains. Each component benefits from RK's unique HIT (Heat Induction Transfer) process, ensuring all parts are properly heat-treated for maximum durability and performance. Features: Chromoly steel construction Seamless rollers and bushings Chromized pins improve wear resistance up to 2x over other non-sealed chains HIT (Heat Induction Transfer) process strengthens components Includes clip-style master link Specifications: Tensile Strength: 4,980 lbs Max CC Rating: 150cc (Off-road) Max Horsepower: 40 Weight: 3.70 lbs Note: Mxz4 chains are for Supercross and Motocross and are not recommended for street use.