DirtyBike Surron Ultra Bee Primary Drive RK MXU Sealed Enduro 420 Replacement Chain
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Replacement RK MXU Chain For All DirtyBike Ultra Bee 420 Primary Chain Drive Systems
The RK MXU sealed 420 chain, a direct replacement for all DirtyBike Ultra Bee 420 primary belt to chain conversion kits. The sealed construction is what suits it to enduro use: the seals hold lubricant in the pin and bush at each link, so the chain keeps its length far longer in mud and water.
Chain pitch is 420, the chain is by RK, and it is sold as a single item at 0.81 lb shipping weight. Verified against the Surron Ultra Bee. DirtyBike also lists a non-sealed MXZ race chain for lower drag. Replace the sprockets with the chain if the old one has stretched past its limit.
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