The RK 520 MXU is an ultra-light sealed-ring racing drive chain built for consistent power delivery and long service life. Designed for off-road race use (125–500cc) while keeping rotating weight low.
Ride faster with less drag and more reliability. The RK 520 MXU is built as one of the lightest sealed-ring racing chains available, helping reduce rotating mass while still delivering serious strength for demanding motocross and enduro racing. It’s engineered to keep power delivery consistent, lap after lap, and to extend chain life compared to non-sealed race chains.
If you’re tired of chains stretching quickly, losing efficiency, or needing constant maintenance, the MXU’s UW-Ring sealing helps keep lubrication where it belongs and protects against dirt and grit—perfect for harsh off-road conditions and race-day intensity.
