All RK chains are pre-stressed and pre-stretched to ensure equal load distribution and minimal maintenance
They’re made of the highest grade medium carbon alloy steel available, with all components shot-peened and heat-treated
- These lightweight chains are developed from advanced alloy materials and manufacturing technology
- Feature Chromoly steel construction with seamless rollers and bushings and all components are heat-treated using RK’s exclusive HIT (Heat Induction Transfer) process
- Moderately priced, both 420 and 428 MXZ chains are the strongest in their class, giving you the best value-performance rating of any MX chain in the world today
- 428 MXZ and GB 428 MXZ – For street bikes up to 250cc and dirt bikes up to 125cc
- Maximum tensile strength of 5,800 lb.





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