The RK 420 MXZ is a lightweight, race-focused non-sealed drive chain built for small-displacement motocross and off-road bikes. Pre-stressed and pre-stretched for even load distribution, it delivers dependable strength with reduced adjustment needs.
The RK 420 MXZ Drive Chain is designed for serious motocross riders who want strong, consistent power transfer with minimal fuss. Built from high-grade medium carbon alloy steel and finished with shot-peening and heat treatment, it’s made to handle hard riding while maintaining reliable performance over time.
Because the chain is pre-stressed and pre-stretched, load is distributed more evenly across the components, helping reduce premature wear and frequent re-tensioning. With chromoly steel construction, seamless rollers and bushings, and oversized alloy pins, the 420 MXZ is a great choice for smaller-displacement bikes where low weight and efficient drivetrain response matter.
