DirtyBike 420 Gold Series Primary Belt to Chain Conversion Kit Sealed X-Ring Surron Ultra Bee

DirtyBike's 420 Sealed X Ring Standard Primary Chain Drive System For Sur-Ron Ultra Bee.

Torture-tested in the 2024 RedBull TKO Extreme Enduro where it performed flawlessly.

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

This system is essential for serious off-roaders and retains the original gear ratio. 420 sealed X-ring chain with master link can be replaced easily without removing the swing arm. Make the job of aligning the mid shaft shaft and swing arm much easier with a DirtyBike

Ultra Bee Swingarm Alignment Tool.

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.

Note: If you are planning to use this kit with the

V1 EMBX XUB-80

motor the front sprocket will require modification. Please

contact us

for more information.

This kit works without modification with the

V2 EBMX UB-80

motor.

Swingarm alignment tool

Buyers and Maintenance Guide

All Natural Lube