RK 520 MXU UW-Ring Chain 800R Quadra-X ring design increases wear

Quadra-X ring design increases wear life and reduces friction by as much as 40% for maximum engine performance

Both 420 and 428MXZ racing chains are the lightest and strongest in their class

Thor Guardian Youth MX Roost Protector

Rubber seals cover joint overlap to keep elements out

RK 520 MXU UW-Ring Chain 800R Quadra-X ring design increases wearRK GB 520 MXU U Ring Chain MXU is one of the lightest sealed ring motocross chains available on the market today. Made for the professional motocross racer, MXU series is the next generation of motocross racing chains featuring RK's ultra slim U Rings or UW Rings. MXU chains are designed to provide the most consistent power delivery with increased chain life. All components are heat treated using RK's exclusive HIT (Heat Induction Transfer) Process.