Designed for motocross racer, lighter weight but stronger chain compare to Heavy Duty Chain.non-sealed chainExcellent quality and cost performance for motocross racers 50-150cc."
"8781
MXU series is the next generation of enduro/motocross racing chains featuring RK?s only technology of Ultra Thin Seal, U-Rings or UW-Rings, make possible to design a Sealed Chain withthe weight of a Non-Sealed Chain....
Premium Replacement for 428 Genuine ChainRK GB428XSO is the best replacement for 428 Non-Sealed OE Chain, featuring XW-Ring that drastically improve the chain life, together with Plating Gold on both Outer and Inner...