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

SKU: UB-PCD-420-GS-XR-G

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