RK 420 MXZ is a lightweight, race-focused non-sealed drive chain built for consistent power transfer and reduced maintenance. Pre-stressed and pre-stretched for even load distribution and reliable performance on the track.
The RK 420 MXZ Drive Chain is designed for riders who demand dependable drive performance under motocross-level loads. Built for serious MX racing, it delivers smooth, efficient power transfer while keeping weight low thanks to its non-sealed design.
To help extend service life and reduce adjustments, every RK chain is pre-stressed and pre-stretched for even load distribution. High-grade medium carbon alloy steel components are shot-peened and heat-treated, and the chain features chromoly steel construction with seamless rollers and bushings plus oversized alloy pins for added strength where it matters most.
