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.