Heavy Hitter Lightweight 420 Primary Chain Drive Conversion Kit

The Heavy Hitter Lightweight 420 Primary Chain Drive Conversion Kit is built for Sur Ron, Segway, E Ride Pro, and EBMX-powered bikes that keep snapping OEM belts. If you’re running high torque through your drivetrain — especially with an upgraded EBMX motor or controller — this is the upgrade that ends mid-ride belt failures. Stronger, lighter, and tuned for maximum performance, it’s the lightest primary kit on the market with the least rotating mass.

After a years of testing, breaking, and refining, we landed on the perfect combo: a 7075 T6 billet aluminum rear sprocket for minimal weight, a nitrided 52100 tool steel front sprocket for maximum durability, and a non-O-ring chain with master link for the least rolling resistance and easy replacement. We even tested vulcanized rubber sprockets for noise reduction, but the performance loss wasn’t worth it this kit is built for speed, not silence.

This conversion maintains your stock gear ratio and OEM motor alignment, with precision machining that extends sprocket life and keeps things smooth at high RPM. Yes, it’s louder than a belt drive, but no louder than most other chain kits and if you ever want it quieter, an O-ring chain can be fitted (at the slight cost of performance). Whether you’re running a stock motor or a high-output EBMX, Sotion, or Torp, setup, this kit is race-proven and ready for abuse.

Important Notice: When installing, make sure your chain tension is loose not tight! Any chain drive that you install should have loose chain tension! Please check the fitment tab for important motor info. (MORE INFO HERE)

Features

• 7075 T6 billet aluminum rear sprocket (black anodized)

• 52100 tool steel front sprocket with nitrided black surface coating

• Lightest primary kit on the market for maximum performance

• 42-link Japanese non-sealed chain with master link included

• Maintains OEM gear ratio and motor alignment

• Precision-machined for long sprocket life and smooth performance

• Best Efficiency Rated Chain Drive on The Market

Fitment

• Sur Ron LBX
• Segway X160 / X260
• E Ride Pro-S
• E Ride Pro-SS / 2.0
• Ventus ONE+
• 79Bike Falcon Pro / GT
• EBMX XLB Series Motors MUST be properly shimmed, or else you will have side wear to the sprockets!! 

Important Notice: When installing, make sure your chain tension is not tight! Any chain drive that you install should have loose chain tension!