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.

Be sure to include the DirtyBike Ultra Bee Swingarm Alignment Tool! Makes the job of aligning the mid shaft shaft and swing arm much easier. 

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