420 Primary Belt to Chain Conversion Kit | Sealed X-Ring | Surron Ultra BeeDirtyBike'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

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 EMBX XUB-80 motor the front sprocket will require modification. Please contact us for more information. 

Swingarm alignment tool

Buyers and Maintenance Guide

All Natural Lube