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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.
The RK EXCEL BL420MRU-130 MRU Black 420 x 130 Drive Chain is engineered for riders who want sealed-chain durability without the added weight commonly associated with sealed designs. Supplied by RK Excel, this motorcycle drive chain uses RK’s proprietary Ultra Thin Seal, or U-Ring, technology. With a seal thickness less than half that of many conventional O-ring seals, the chain delivers the lightweight feel of a non-sealed chain while providing improved protection against contaminants and lubricant loss.
Designed for dependable street and off-road performance, the RK EXCEL MRU chain offers up to four times the service life of comparable non-sealed 420 chains. Its sealed construction also helps reduce the frequency of chain adjustments, supporting consistent power transfer and easier maintenance. The black finish provides a clean, performance-focused appearance for compatible motorcycle applications.
With a tensile strength of 4,540 pounds, the BL420MRU-130 is rated for applications up to 150cc on both street and off-road motorcycles and supports engines producing up to 25 horsepower. The chain includes a clip-type master link for installation. Verify your motorcycle’s chain size, length, and application requirements before ordering.
Features:
- RK Excel Ultra Thin Seal U-Ring technology for sealed-chain protection with reduced weight
- Up to four times longer chain life than comparable non-sealed 420 chains
- Requires fewer chain adjustments than comparable non-sealed 420 chains
- Tensile Strength: 4,540 pounds
- Maximum Engine Displacement: 150cc street and 150cc off-road
- Maximum Horsepower: 25 HP
- Chain Weight: 1.74 pounds
- Maximum Chain Width: 0.67 inches
- Clip-type master link included
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RETURN POLICY 2026
ALL DISCOUNTED AND SALE ITEMS ARE A FINAL SALE !!!
We have a 14-day exchange policy on regular priced items only , ( discounted or sale items are not eligible for return ) , which means you have 14 days after receiving your item to request a exchange.
WE DO NOT REFUND we exchange only ...
PROCESSED ORDERS THAT ARE REQUESTING A CANCELLATION ARE SUBJECT TO A 20% RESTOCK FEE
To be eligible for a exchange, your item must be in the same condition that you received it, unopened or unused, with tags and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a exchange, you can contact us at usaspeedguys@gmail.com. Please note that exchanges will need to be sent to the following address and require an authorization first :
THE SPEED SHOP USA
ATT RETURNS
PO BOX 1254
PEACHLAND BC CANADA
V0H1X0
CANADA POST REGULAR SERVICE
If your exchange is accepted, we’ll send you a return authorization number, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any exchange question at usaspeedguys@gmail.com.
SHIPPING ON RETURNS IS AT YOUR EXPENSE WE DO NOT PAY FOR RETURN SHIPPING
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned LIKE custom order products (such as special orders or personalized items). We also do not accept returns for hazardous materials, flammable liquids, or gases. There is NO RETURNS on lighting or electrical components at all PERIOD . Please get in touch if you have questions or concerns about your specific item.
Unfortunately, WE DO NOT accept returns on sale items, DISCOUNTED ITEMS or gift cards.
Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
WE DO NOT REFUND WE ONLY EXCHANGE
European Union 14 day cooling off period
Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days . As above, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
Exchanges
We will notify you once we’ve received and inspected your return and let you know if the exchange was approved or not. If approved, you will have 30 days to complete your exchange.
If more than 15 business days have passed since we’ve approved your return, please contact us at usaspeedguys@gmail.com
