Primary Chain Kit 219 for Sur-Ron Light Bee – 13T/30T Belt Delete

The Primary Chain Kit 219 is a primary drive conversion built for the Sur-Ron Light Bee electric dirt bike. It replaces the factory toothed belt and both pulleys with a #219 chain, a 13T motor sprocket and a 30T jackshaft sprocket. Both sprockets are machined from hardened steel. The kit fits the Light Bee X and Light Bee S.

The primary drive carries motor power across to the reduction shaft, also known as the jackshaft. That is exactly where the stock belt tends to snap. A chain handles this stage far more predictably, so this kit was developed for sand, mud and hard off-road use.

Installation is bolt-on. Because the 13T/30T pairing matches the factory gearing, transmission geometry stays the same. Your secondary 420 chain is untouched, and the final drive ratio does not change at all.

Key Benefits

• Stronger than the belt – the #219 chain resists sand, mud and impact damage.
• Higher efficiency – a chain has less contact area and lower friction than a belt drive.
• Simpler maintenance – swapping a chain is far quicker than fitting a new belt.
• No swingarm removal – the chain is split and replaced in place, with no transmission teardown.
• OEM gear ratio – the 13T/30T combination preserves the original transmission geometry.
• Hardened steel sprockets – both sprockets resist tooth wear over long service intervals.
• Steadier power delivery – power transfers more evenly over rough ground and landings.
• Bolt-on fitment – no chassis modification is needed to install the kit.

Who Is This Kit For?

This kit suits Sur-Ron Light Bee lightweight electric motocross bikes, including the Light Bee X and the Light Bee S. It is an upgrade kit rather than a repair part, and it replaces the factory belt-driven primary drive entirely.

Riders who spend time in sand, mud and dust benefit first. Those conditions wear a toothed belt faster than anything else. Enduro riders who jump and repeatedly load the transmission also see the difference, since chain drive tolerates shock loading better than a belt.

Finally, the kit appeals to anyone who wants shorter sessions in the garage. Because the chain can be split and replaced on the bike, servicing takes noticeably less time than a belt change.

What’s in the Box

• 13T motor sprocket in hardened steel
• 30T reduction shaft (primary) sprocket
• #219 chain, cut to length for the OEM gear ratio

Technical Specifications

Why Choose This Primary Chain Kit?

Belt drive simply demands more workshop time. Replacing a belt usually means dropping the swingarm first. With this kit you split the chain and fit a new one while the bike stays assembled.

A chain also runs with a smaller contact area than a belt. Friction losses drop as a result, so more of the motor’s output reaches the rear wheel. The #219 standard comes from kart racing, where high strength in a compact package matters most.

Just as importantly, riding character stays intact. Since 13T/30T is the factory pairing, top speed and acceleration remain unchanged. Only the construction of the primary drive is different.

Installation and Maintenance Tips

• Check sprocket alignment and chain tension after the first 20-50 km.
• Use a lubricant formulated for #219 chains.
• Avoid aggressive solvents, because they damage seals.
• Confirm that the chain guard or cover does not rub against the chain.

FAQ

Will this kit fit my Sur-Ron Light Bee X?

• Yes. The kit is designed for the Sur-Ron Light Bee, including the Light Bee X and Light Bee S versions.

Does the 13T/30T ratio change how the bike rides?

• No. It matches the factory ratio, so acceleration and top speed stay the same.
• Only the primary drive construction changes from belt to chain.

Do I need to remove the swingarm to fit it?

• No. Installation is bolt-on and the chain is serviced in place.
• That is the main practical advantage over the stock belt.

Does the rear 420 chain need to be changed too?

• No. The secondary 420 chain and the final drive stay untouched.

Why does the stock belt fail on the Sur-Ron Light Bee?

• The primary drive transfers motor power to the reduction shaft.
• Sand, mud and dust attack the toothed belt at this point.
• Jumps and heavy transmission loading accelerate the damage.

What material are the sprockets made from?

• Both the 13T motor sprocket and the 30T reduction shaft sprocket use hardened steel.

How do I maintain the #219 chain?

• Lubricate it periodically with a suitable #219 chain lubricant.
• Check tension and sprocket alignment regularly.
• Keep aggressive solvents away from seals.

Are any chassis modifications required?

• None. The kit bolts on without reworking the chassis.

If sand and mud are part of your riding, the primary belt is usually the first thing to give up. This #219 chain conversion moves that stage of the drivetrain onto hardened steel sprockets and a kart-grade chain, while keeping factory gearing and roadside serviceability.