What Sur-Ron tuning is

Sur-Ron tuning means improving the power, traction and reliability of a stock electric motorcycle (usually the Light Bee X or Ultra Bee) by changing the controller, motor, battery pack, final drive and cooling. Done properly, tuning falls into three stages: from ride feel and gearing prep (Stage 1) to a mid-drive motor on a high-voltage system (Stage 3).

Sur-Ron electric motorcycles are popular for their low weight, quiet PMSM motor and modular design - which is exactly why they respond so well to tuning. The stock Light Bee X runs a 60 V (16S) system, a sine-wave (FOC) controller and a power-limited motor peaking at roughly 8 kW. Its bigger sibling, the Ultra Bee, leaves the factory with a 74 V system and around 21-25 kW peak.

It is important to understand the difference between power tuning and reliability tuning. Some parts (controller, battery, motor) add traction and speed; others (cooling, quality connectors, reinforced drivetrain, brakes) let you use that power safely and for a long time. Good tuning is always systems work - once you raise power, the whole chain has to be matched to it.

The weakest link decides the outcome: a 50 kW motor with stock brakes and thin wiring is not tuning, it is a risk.

Tuning stages: Stage 1-3

The stages are not a factory standard, but a clear logic has settled in across EU workshops. Each stage builds on the previous one - from the cheapest preparation step to a full hardware rebuild.

Controllers: Torp vs stock vs eBMX / SiliXcon

The controller (MCU) decides how much phase current reaches the motor - and phase current is what creates traction from low revs. That is why the first real jump in power is usually not the motor, but a stronger controller with a higher-voltage battery.

Stock controller

Reliable, plug & play, fully protected, but the power is locked at the factory and cannot be raised - more power means replacing the controller.

Torp (TC500 2.0 and TC1000)

Torp TC500 2.X - a roughly 25 kW class controller supporting up to 80 V (22S, ~92.4 V fully charged) and keeping the stock functions over the CAN bus. Torp TC1000 2.X - up to 1000 A phase current and up to 60 kW; the pro-level choice, made for the TM40 Pro motor.

eBMX and SiliXcon

eBMX X-9000 V3 (VESC/FOC, 60-84 V, up to 1600 A burst phase current, IP67) delivers the highest phase current - up to 50 kW. It therefore needs a strong battery, clean QS8 wiring and precise tuning. SiliXcon controllers are built for racing - highly configurable, but demanding to set up.

FabiRide builds complex custom systems in-house and programs both ASI and SiliXcon controllers ourselves.

Motors: TM40 Pro and mid-drive solutions

The stock Sur-Ron motor is a mid-mounted PMSM type, dependable for everyday riding but limited in power. Serious Stage 3 tuning replaces the whole motor - the most popular choice being the Torp TM40 and the stronger TM40 Pro.

*Value at the motor shaft; final torque at the wheel depends on the gearing ratio. The TM40 Pro draws up to ~1100 A phase current, so it requires a matching controller (e.g. the TC1000).

Important: the TM40 and TM40 Pro require the whole bike to be prepared - reinforced chain, sprockets, belt, brakes and a suitable battery. Swapping only the motor without matching the rest of the system quickly ends in failures.

Batteries and voltage: 60 / 72 / 84 V

In a tuned build the battery does two jobs: voltage (volts) mostly determines speed and power, while capacity (Ah / Wh) - determines range. As voltage rises, so does what the system can do:

• 60 V (16S) - the stock Light Bee system, ~67.2 V fully charged.
• 72 V (20S) - the most popular Stage 2 upgrade, ~84 V fully charged.
• 84 V (22S) - Stage 3 level, ~92.4 V fully charged, matched to the TC500/TC1000.

Just as important are the battery’s discharge capability (C-rate) and the BMS - these are what let the controller pull high currents without overheating. FabiRide builds custom lithium-ion packs in our Kaunas workshop and ships them across the EU, so voltage, capacity, cell grade and connectors (e.g. a QS8 6AWG power harness) can be matched precisely to your tuning stage.

Gearing and cooling

Sprockets and chain

The final drive is set by the front-to-rear sprocket tooth ratio. A smaller rear (or larger front) sprocket raises top speed, but reduces low-end pull; the opposite combination gives more traction and hill climbing. Once power goes up, it is worth choosing a reinforced chain and sprockets that can take the extra torque.

Cooling and the thermal limit

More current means more heat in the motor and the controller. An overheated controller starts cutting power automatically (thermal derating) - so higher stages need better cooling, good thermal contact and the right cable cross-section. Cooling is often what separates a bike that is fast for one lap from one that is fast all day.

Safety and reliability

As power rises, every stage has to be matched by an upgrade of the safety components. Recommended order:

• Brakes - larger discs, better pads from Stage 2 on.
• Tyres and wheels - tread and compound suited to the surface.
• Connectors and cable - QS8 connectors, 6AWG harnesses instead of thin stock wiring.
• BMS and fuses - protection against overload, short circuit and overheating.
• Frame and steering joints - inspection, since vibration and loads increase.

Power that is reliably installed matters just as much as the power itself. A poor connector or an overheating cable can stop even the most expensive system.

Riding on public roads

Across the EU, an electric bike or motorcycle whose power exceeds certain limits is classed as a moped (L1e) or a motorcycle (L3e) and becomes a registrable vehicle. It is worth understanding this before planning a tuning project.

In practice, tuning at most stages exceeds the L1e limits, so such a Sur-Ron can no longer be registered as a moped and is intended for closed tracks and private land. If you need public-road use, power and speed limits must meet L1e (or L3e with the matching registration). Always check the exact conditions against the rules in your own country - this is general information, not legal advice.

What Sur-Ron tuning costs

There is no single price - the cost of tuning depends on the stage chosen, the class of components and the amount of work involved. The same Stage 2 can vary widely depending on battery capacity or controller model. Below are the main factors that drive the cost:

Since every project is individual, the most accurate figure comes after a short consultation about your model and goals. Call +370 604 15255 or write to us, and we will put together a quote - we ship parts across the EU and worldwide.

How to choose a tuning workshop

Tuning quality depends less on the parts than on who fits and configures them, and how. When choosing a workshop, look for:

• A real workshop with proper equipment, not just component resale.
• Experience in controller tuning and programming (Torp, eBMX, SiliXcon).
• A warranty on the work and a clear, transparent process with a quote up front.
• The ability to build battery packs and custom systems in-house.
• References and real builds, not just marketing promises.

FabiRide was among the first workshops in Lithuania to build custom electric-motorcycle tuning and repair, and the first in Lithuania to officially integrate ASI controllers into Sur-Ron and Talaria. In our Kaunas workshop (S. Raštikio g. 28) we tune Sur-Ron, Talaria and Eride Pro, handle electronics, BMS and controller work and build custom Li-ion battery packs. We ship parts across the EU and worldwide, and take in bikes and components sent to us for repair and programming.