These lightweight mini-works racing chains were developed from the same advanced alloy material and manufacturing technology as GB520MXZ. Both 420 and 428MXZ Racing Chains are the strongest in their class giving you the best Value-Performance rating of any MX Racing Chain in the world today! Available in Gold or Standard Metal finishes.  

MXZ chains feature Chromoly steel construction with seamless rollers and bushings, and oversized special alloy pins for added strength. All components are heat-treated using RK's exclusive HIT (Heat Induction Transfer) process.