The RK 420 MXZ4 is a heavy-duty motorcycle chain designed for demanding off-road riding and motocross applications. This 120-link chain is manufactured from chromoly steel and features seamless rollers and bushings for dependable strength and consistent operation. The RK brand and manufacturer part number GB420MXZ4-120 provide a reliable reference for replacement and fitment when servicing compatible motorcycle, ATV, and off-road drivetrains.
Chromized pins improve wear resistance by more than two times compared with conventional non-sealed chains, helping the chain withstand repeated impact and abrasive riding conditions. The pins are also engineered to absorb shock loads generated by extreme jumps and aggressive landings. RK uses its exclusive Heat Induction Transfer (HIT) process to heat-treat the chain, supporting durability and performance under demanding off-road use.
Fitment: Intended for compatible 420-size motorcycle, motocross, and off-road applications requiring a 120-link chain. Confirm the vehicle manufacturer’s chain size, required link count, and drivetrain specifications before installation. The RK 420 MXZ4 is not recommended for street use and is best suited to off-road applications where its heavy-duty construction and wear-resistant components can be properly utilized.
Features:
- Size: 420 chain with 120 links for compatible off-road drivetrains
- Model: MXZ4 heavy-duty motocross chain
- Construction: Chromoly steel with seamless rollers and bushings
- Pins: Chromized pins provide more than two times the wear resistance of normal non-sealed chains
- Shock absorption: Designed to absorb loads from extreme jumps and hard landings
- Heat treatment: RK-exclusive Heat Induction Transfer (HIT) process
- Fitment: Compatible with select motorcycles, motocross bikes, and off-road vehicles requiring a 420 chain
- Use: Not recommended for street applications