The RK 428MXU is the lightest sealed-ring enduro/motocross chain available in market today, 13.8g/link, only 0.1g/link heavier than RK 428MXZ4 non sealed chainThe MXU chain series is the next generation of enduro/motocross racing chains featuring the RK patented technology of Ultra Thin UW-Rings, which make it possible to design a Sealed Chain with the weight of a Non-Sealed Chain.UW Seal Rings stop debris and dirt entering the chain rollers which ensures efficient horsepower transmission from the engine to the rear wheel throughout the chain life

• For Enduro & Motocross
• RK UW Seal Ring
• Lightest off-road seal chain 
• Use by Graham Jarvis
• Use by Top MXGP teams

Manufacturer Part No. (MPN): GB428MXU-134-CL
Barcode: 4935531503620