The Ultimate Guide to Sur-Ron Primary Drives: Belt, 420 or 219?

This is THE question every Sur-Ron Light Bee owner eventually asks: what to do with that cursed primary drive? Tired of breaking belts mid-ride? Is your 420 chain kit making a terrible noise on the asphalt? After years of trials, tribulations, and testing on our own machines, we finally have a clear answer. In this ultimate guide, we give you our complete verdict on each option.

1. The Starting Point: The Original Belt

From 2019 to 2021, like everyone else, we rode with the original belt. Its advantages are undeniable: it's quiet and offers great flexibility. But its main drawback is prohibitive for anyone increasing power: its fragility. Mud and stones are its worst enemies, and a break in the middle of a ride can happen quickly. To limit this problem, we developed our carbon belt guard, but the radical solution remained switching to a chain.

2. Reliability Revolution: The 420 Chain Kit

At the time, the only reliable solution was the 420 chain kit. We first used basic kits, which solved the breakage problem but created another: a deafening noise, especially on the road. Then came the Warp 9 420 chain kit. With its integrated "bumper" (damper), it was a real revolution, significantly reducing noise and jerks. For years, this was THE essential reference for us, a product we sold by the hundreds because it offered the best reliability/noise compromise on the market.

But two drawbacks remained: a persistent noise at high speeds and significant heat, synonymous with friction and therefore loss of energy.

3. The New Challenger: The 219 Chain Kit

Recently, a new technology from karting has emerged: the 219 chain kit. Thinner and lighter, it promised less noise and less heat. Skeptical at first ("what is this bracelet?"), we decided to test it intensively for 6 months before offering it in the shop.

The Verdict after 6 Months of Torture:

• Noise: It's confirmed. Once the chain is broken in, the 219 kit is significantly quieter than the 420, whether in enduro or on the road in supermoto mode. The sound is higher pitched but less voluminous.

• Heat and Efficiency: This is the most impressive point. Even after long sessions at full power, the chain remains barely warm. Less heat means less friction, and therefore better power transmission to the wheel.

• Reliability: Despite its fragile appearance, this chain can handle anything. We pushed it up to 31kW, in enduro, in motocross with heavy landings, and on the road. With classic maintenance and correct tension (neither too tight nor too loose), it hasn't budged.

4. The Future? The Return of the Belt with Carbon

While the 219 kit establishes itself as the king of silence/reliability, a new technology is emerging for those seeking absolute silence: reinforced carbon belts. Wider and much more resistant than the original models, they can handle very high power while maintaining the flexibility and silence of a belt. We already offer them in the shop, such as the EBG carbon kit, and we plan to test them more thoroughly very soon.

Conclusion: Which Drivetrain to Choose Today?

After testing everything, our verdict is clear. For the vast majority of users who have a modified Sur-Ron (from 8kW to over 20kW) and who practice mixed use (enduro, leisure rides, some road), the 219 chain kit is currently the best compromise on the market. It offers the reliability of a chain without the deafening noise of the 420, while improving transmission efficiency.

To celebrate the release of this video, we are offering -10% off our entire Transmission category for one week with the code TRANSMISSION10. It's the perfect time to upgrade your machine!

Discover our full range of primary drives here!