All RK chains are prestressed 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
With a maximum tensile strength of 9000 lb. and weight of 2.89 lb., the newly designed GB 520 MXZ4 is the lightest and strongest MX chain
on the market
For 100cc/125cc applications
Chains include clip connecting link
GB 420 MXZ
Wear Life Index: 200
Average Tensile Strength (lb.): 5,000
Maximum Engine CC Street/Dirt: 150/100
GB 428 MXZ
Wear Life Index: 200
Average Tensile Strength (lb.): 5,800
Maximum Engine CC Street/Dirt: 250/125
GB 520 MXZ4
Wear Life Index: 300
Average Tensile Strength (lb.): 9,000
Maximum Engine CC Street/Dirt: NA/500
NOTE: Wear Life Index should be used as a comparison for probable wear life under identical circumstances.
Think of it as a percent, with standard chains being 100.
