Description
Is Your Stock Ultra Bee Leaving Power on the Table?
There is a moment every Ultra Bee rider knows, you twist the throttle hard out of a corner or hit a steep climb, and the bike does not respond the way you know it should. The stock gearing is a factory compromise, calibrated to suit the broadest possible range of riders rather than those who actually push their machines. If you have ever felt that hesitation, that slight lag where you wanted instant, aggressive torque, the problem is not your motor. It is your sprocket.
Upgrade Your Ride with the Full-E Charged 520-54T Rear Sprocket
eMotoX Sports is a UK specialist distributor of electric motocross parts, and the Full-E Charged 520-54T Rear Sprocket is one of the most impactful single upgrades you can make to your Sur-Ron Ultra Bee. By stepping up to 54 teeth, you shift the gear ratio decisively in favour of low-end torque and acceleration. The result is a bike that pulls harder from the moment you open the throttle, lifts the front wheel with far less effort, and feels genuinely alive on technical terrain.
The sprocket is CNC machined from 7075 T6 aluminium alloy, the same grade used in aerospace and high-performance motorsport applications, and finished with a hard anodised coating that resists wear, corrosion, and the kind of abuse that trail riding dishes out. It is a direct fit for the stock 520 chain, so installation is straightforward and requires no additional components.
How to Get More from Your Ultra Bee in Three Simple Steps
- Select your preferred colour from the eight anodised options available and add it to your basket.
- Once it arrives, remove the stock rear sprocket and fit the 520-54T in its place using the existing hardware, then check your chain tension.
- Your very next ride will feel like a different bike.
What Happens If You Stick with the Stock Sprocket
- Sluggish throttle response and poor low-end torque
- Struggling on technical climbs and loose terrain
- Accelerated chain and drivetrain wear from mismatched gearing
- Never unlocking the full potential of your Ultra Bee motor
What You Gain with the Right Gearing
- Immediate, aggressive acceleration from the moment you open the throttle
- Effortless wheelies and confident cornering exits
- Superior performance on steep climbs and technical singletrack
- A lightweight, hard-anodised sprocket that looks as good as it performs
Built for Electric Motocross. Engineered for the Ultra Bee.
This is not a generic sprocket adapted from a petrol bike catalogue. The Full-E Charged 520-54T is designed specifically around the drivetrain geometry and 520 chain specification of the Sur-Ron Ultra Bee, ensuring precise fitment and optimal power transfer from the first ride.
Upgrade Your Sur-Ron Ultra Bee Today
Full-E Charged 520-54T Rear Sprocket: Unlock the True Performance of Your Sur-Ron Ultra Bee
The Full-E Charged 520-54T Rear Sprocket is a precision-engineered replacement for the stock rear sprocket on the Sur-Ron Ultra Bee. It is a direct-fit component, requiring no modification to the bike and no additional hardware beyond the existing mounting bolts.
Key Features:
- Direct Replacement: Designed as a drop-in replacement for the stock Sur-Ron Ultra Bee rear sprocket, ensuring straightforward installation and perfect compatibility.
- 7075 T6 Aluminium Alloy Construction: CNC machined from aerospace-grade aluminium for an exceptional strength-to-weight ratio, significantly lighter than steel alternatives without sacrificing durability.
- Hard Anodised Finish: The anodised surface treatment provides superior resistance to wear, corrosion, and impact compared to standard painted or uncoated sprockets.
- Performance Gearing: The 54-tooth configuration increases the gear ratio, delivering a marked improvement in low-end torque and acceleration over the stock sprocket.
- Eight Colour Options: Available in Black, Blue, Gold, Green, Orange, Purple, Red, and Silver to complement your bike’s livery.
Specifications:
- Chain Size: 520
- Teeth: 54T
- Material: 7075 T6 Aluminium Alloy
- Surface Treatment: Hard Anodised
- Fitment: Sur-Ron Ultra Bee
- Available Colours: Black, Blue, Gold, Green, Orange, Purple, Red, Silver
Function and Importance
- Power Transfer: The rear sprocket is the final link in the drivetrain, converting motor output into forward motion via the chain. Its condition and specification directly affect how efficiently that power reaches the ground.
- Gear Ratio Impact: Changing the rear sprocket size alters the overall gear ratio. A larger sprocket (more teeth) increases torque and acceleration at the expense of top speed; a smaller sprocket does the reverse.
- 54T vs Stock: The stock Ultra Bee rear sprocket is a balanced compromise. The 54T upgrade shifts the balance firmly towards low-end grunt, making the bike feel substantially more powerful in the conditions where electric motocross is ridden.
- Battery Efficiency: A well-matched sprocket allows the motor to operate in a more efficient range, which can contribute to improved battery range on technical terrain.
CHECK YOUR ULTRA BEE DRIVE SPROCKETS
Neglecting your drive sprockets can lead to serious safety risks and mechanical failures. Worn or damaged sprockets cause chain slippage, power loss, and in severe cases chain derailment, putting you at risk of losing control at the worst possible moment.
Dangers of Worn Sprockets:
- Chain Slippage: Can result in sudden power loss, leading to dangerous stalls or loss of traction.
- Drivetrain Failure: A broken or derailed chain can leave you stranded or cause unexpected crashes.
- Reduced Control: Uneven power delivery makes handling unpredictable, especially on rough terrain.
- Battery Drain and Overheating: Worn sprockets force the motor to work harder, reducing efficiency and increasing wear.
How to Stay Safe:
- Inspect sprockets regularly for hooked, worn, or damaged teeth.
- Check for chain misalignment or excessive slack, both signs of a failing sprocket.
- Replace worn sprockets and chain together to prevent premature failure.
- Keep the drivetrain clean and lubricated for optimal performance and longevity.
Further Reading and Resources
To help you get the most from your drivetrain components and understand the principles behind your upgrade, we have compiled a list of useful external guides and resources from trusted industry sources.
Gearing Changes Explained, RevZilla
https://www.revzilla.com/common-tread/gearing-changes-explained
A comprehensive guide from RevZilla that breaks down how changing your sprocket sizes affects your bike’s performance, torque, and top speed. An excellent primer for any rider looking to understand the mechanics of gearing before making a change.
Sprockets and Chains: How to Optimise Your E-Moto for Maximum Power
https://tbelectricmoto.com/blogs/news/sprockets-chains-how-to-optimize-your-e-moto-for-maximum-power
This article from an e-moto specialist provides specific advice on optimising your electric bike’s drivetrain, covering the relationship between sprockets and chains for achieving peak power and efficiency on the trail.
Chain Maintenance Guide, DID Chain
https://www.didchain.com/blogs/news/chain-maintenance
From the experts at DID, this guide covers the essential steps for motorcycle chain maintenance, including cleaning, lubrication, and tension adjustment. Proper maintenance is key to extending the life of your new sprocket and keeping your drivetrain running smoothly.
How to Clean a Motorcycle Chain, Motorcycle News
https://www.motorcyclenews.com/advice/workshop/how-to-clean-a-motorcycle-chain/
A practical, step-by-step tutorial from MCN on how to properly clean your motorcycle chain, a critical task for ensuring the longevity and smooth operation of your entire drivetrain system after every ride.
Frequently Asked Questions — Sur-Ron Ultra Bee 54T Rear Sprocket 520
1. What is the main benefit of fitting a 54T rear sprocket to my Sur-Ron Ultra Bee?
The primary benefit is a significant increase in low-end torque and acceleration. The larger sprocket changes the gear ratio so that the motor delivers more pulling power at lower speeds, which is ideal for technical trails, steep climbs, and aggressive riding where instant throttle response matters most.
2. Will fitting a larger rear sprocket reduce my top speed?
Yes, it will. Increasing the number of teeth on the rear sprocket raises the gear ratio, which improves acceleration but reduces maximum top speed on flat ground. This upgrade is best suited to riders who prioritise punch and torque over outright speed.
3. Is this sprocket compatible with the stock 520 chain on the Ultra Bee?
Yes. The Full-E Charged 520-54T sprocket is designed as a direct replacement for the stock rear sprocket and works with the existing 520 chain. No chain replacement is required, though you should always check chain tension and condition when fitting any new sprocket.
4. What is the sprocket made from, and how durable is it?
The sprocket is CNC machined from 7075 T6 aluminium alloy, which offers an excellent strength-to-weight ratio and is widely used in high-performance motorsport applications. The hard anodised finish provides superior resistance to wear, corrosion, and impact compared to standard painted or uncoated alternatives.
5. Can I choose the colour of my sprocket?
Yes. The Full-E Charged 520-54T sprocket is available in eight anodised colours: Black, Blue, Gold, Green, Orange, Purple, Red, and Silver. Select your preferred colour from the variation options before adding to your basket.
6. How difficult is it to install the sprocket?
Installation is straightforward for anyone with basic mechanical knowledge. The sprocket is a direct fit for the Sur-Ron Ultra Bee, using the existing mounting hardware. Remove the stock sprocket, fit the new one, and check your chain tension. No specialist tools are required beyond a standard socket set.
7. When should I replace my rear sprocket?
You should inspect and consider replacing your sprocket if you notice hooked or worn teeth, the chain slipping or skipping under load, increased drivetrain noise, or visible damage to the sprocket face. Regular checks before each ride help prevent larger drivetrain failures.
8. Should I replace the chain at the same time?
It is strongly recommended. A worn chain will accelerate wear on a new sprocket, and a worn sprocket will do the same to a new chain. For the best results and longest service life, replace both together and start with a fresh drivetrain setup.
9. Why choose eMotoX Sports for my sprocket upgrade?
At eMotoX Sports, we specialise exclusively in electric motocross parts. Every component we stock is selected and tested for e-bike performance, not adapted from generic petrol bike catalogues. You are buying from a UK specialist who understands the Ultra Bee and the demands of electric off-road riding.
10. How long will this sprocket last?
Lifespan depends on riding conditions and maintenance, but with proper care, regular cleaning, correct chain tension, and timely lubrication, a high-quality anodised aluminium sprocket will last significantly longer than cheaper uncoated alternatives.
