DirtyBike RK 420 Gold Series Primary Belt to Chain Conversion (Surron LBX | E-Ride PRO)
DirtyBike RK 420 Gold Series Primary Belt to Chain Conversion (Surron LBX | E-Ride PRO)

DirtyBike RK 420 Gold Series Primary Belt to Chain Conversion (Surron LBX | E-Ride PRO)


Regular price$84.00
Shipping calculated at checkout.

  • In stock, ready to ship
  • Inventory on the way

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original undamaged packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at info@zealracing.com. Please note that returns will need to be sent to the following address: 610 West avenue O, Unit 101 Palmdale CA, 93551

If your return is accepted, we’ll send you a return shipping label, 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 return question at info@zealracing.com.

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 products or power upgrades (such as Talaria E-Moto Bikes, Custom graphic kits, EBMX Batteries, Any electronic components O.E.M or aftermarket, EBMX controllers, EBMX motors or personalized items). We do not accept returns for hazardous materials (Batteries of any kind). Please get in touch if you have questions or concerns about your specific item. 

Any return requests on electronic components including all Power upgrade parts are subject to approval and will have a 10% restocking fee applied if approved.

Unfortunately, we cannot accept returns on sale items or gift cards.

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 can process an exchange order but your new exchange item will not ship until the original item purchased has been returned. 

We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded (minus your original shipping cost and 10% restocking fee if applied to the specific return items) on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too. 
If more than 15 business days have passed since we’ve approved your return, please contact us at info@zealracing.com.

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DirtyBike Industries primary drive system now available with the best sealed 420 chain available. RK 420 GB MXU!

If you ride in dusty, sandy or muddy conditions you may have primary belt slippage which will eventually fail the stock primary belt, possibly leaving you stranded in the middle of nowhere. Don’t let this happen! Install a DirtyBike Industries primary chain drive system. With the world famous RK GB4MXU chain, this is a necessary upgrade for the serious off-road rider and maintains stock gear ratio.

RK GB420MXU Sealed chain is one of the strongest and quietest 420 chains available.

Master link makes for easier installation and the chain can be replaced easily without removing the swing arm.

This kit comes with db DirtyBike Industries exclusive 1mm aluminum alignment shim allowing you to adjust the sprocket alignment for a quieter, longer lasting drive system.

Buyers and Maintenance Guide

Installation Tool






219H standard chain

On road and light off road with stock power

219H RK O-ring and non-O-ring kits

On road and off road up to 16Kw

420 with sealed x-ring

Off road over 16Kw

420 with non-O-ring chain

Racing only. Very Loud!


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