RK Chain · New
RK Chain MRU420-120 U-Ring Chain
MPN BL420MRU-120 · Store SKU rkcBL420MRU-120
Supplier stock checked 11/7/2026, 4:49:58 PM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
The MRU features RK’s proprietary Ultra Thin Seal, U-Rings, where the thickness of the seal is less than 50% of the most common O-ring seal. This allows RK to design a Sealed Chain with the weight of a Non-Sealed Chain. MRU will feature 4 times longer chain life than comparable non-sealed 420 chains and will require less chain adjustments compared to non-sealed 420 chains. MRU is available in RK’s Black Scale finish with black inner and black outer sideplates with gold pins and gold rollers.
Manufacturer fitment & guides
Check BL420MRU-120 against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
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