RK Chains 428 MXZ4 Chain

The RK 428 MXZ4 Chain is engineered for the intense demands of motocross and supercross racing, delivering exceptional strength and durability for competitive riders. Built from high-quality Chromoly steel, the MXZ4 features seamless rollers and bushings for smooth, consistent performance under extreme conditions. Chromized pins provide more than double the wear resistance of standard non-sealed chains while helping absorb shock loads from hard landings and aggressive riding. RK’s exclusive HIT (Heat Induction Transfer) process ensures all components are precisely heat treated for maximum toughness and longevity. Designed specifically for 428 pitch applications on smaller displacement race bikes, the MXZ4 is built to perform when it matters most. This chain is intended for off-road racing use only and is not recommended for street applications.

• 428 pitch racing chain designed for motocross and supercross use
• Chromoly steel construction for superior strength and durability
• Seamless rollers and bushings for smooth operation and reduced wear
• Chromized pins offer more than 2x wear resistance over standard non-sealed chains
• HIT (Heat Induction Transfer) heat treatment for enhanced toughness
• High shock-load absorption for extreme riding conditions
• Tensile strength: 6,400 lbs
• Maximum engine size: 150cc off-road
• Maximum horsepower rating: 40 HP
• Weight: 2.21 lbs
• Maximum chain width: 20.2 mm
• Includes clip-type master link
• Not recommended for street use

Specifications

Part Numbers Specification