Enduro Primary Belt to Chain Conversion Kit | 420 RK MXU | Surron Ultra Bee
Enduro Primary Belt to Chain Conversion Kit | 420 RK MXU | Surron Ultra Bee
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Ultra Bee Primary Chain Drive Enduro Kit With 420 RK MXU Sealed Chain
For serious off road and enduro racers the sealed RK chain kit is super durable and will last longer between lubes than non-sealed chain kits.
- More Efficient Than Belt
- Better Acceleration
- Longer Run Time
- Easy Maintenance
- Similar To Stock Gear Ratio
- Chain can be replaced without removing the swing arm
There is a good reason that we do not offer a 520 size chain for this bike. Over the same size sprocket a larger chain will create more heat because the larger links have to articulate considerably more that a smaller chain. This extra movement creates excess heat which can cause chain failure sooner.Â
Aligning the mid shaft shaft and swing arm will be much easier with the DirtyBike Ultra Bee Swingarm Alignment Tool!Â
Note: If you are planning to use this kit with the EMBX XUB-80 motor the front sprocket will require modification. Please contact us for more information.Â

Please be aware that many electric bikes sold by RegenRides, its partners, and wholesalers are intended exclusively for off-road use at their speed and power factory setting. Bypassing or modifying the bike restrictions does not adhere to proper use and as the owner, you will assume full responsibility and liability. It is important to acknowledge that these vehicles may not adhere to specific national, federal, provincial, and/or local laws or regulations.
As the buyer, it is your responsibility to thoroughly acquaint yourself with any potential restrictions that may apply to the usage of such a product in your specific location. You assume complete liability for the choices you make regarding its utilization and any potential ramifications that may arise as a result.
This vehicle is not an "electric assisted bicycle" as defined by North Carolina Motor Vehicle Code and is instead a type of motor vehicle and subject to applicable motor vehicle laws if used on public roads or public lands. Your insurance policies may not provide coverage for accidents involving the use of this vehicle. To determine if coverage is provided you should contact your insurance company or agent.