High-Power Mid-Drive Motor Upgrade for Sur-Ron Light Bee
The Torp TM25 is a high-output IPM (Interior Permanent Magnet) mid-drive traction motor designed as a serious performance upgrade for the Sur-Ron Light Bee. Built for riders who want stronger pull, improved efficiency, and controller-ready feedback options, TM25 supports a wide 48–120 V operating range and delivers 13 kW continuous power for sustained trail, enduro, and track use.
Unlike many “universal” swaps, the TM25 is engineered around the Light Bee platform and pairs directly with Torp’s proven inverters—making it an ideal foundation for high-voltage builds, torque-focused setups, and reliable power delivery in demanding off-road conditions.
Why riders choose the TM25
- 13 kW continuous power (48–120 V) – built to hold power consistently, not just peak on paper.
- Up to 40 kW peak at 120 V – headroom for high-performance builds and aggressive tuning.
- Very low resistance: 3.4 mΩ – listed as ~3× lower than the stock Sur-Ron motor, helping reduce losses and heat.
- Hall sensor or encoder feedback – choose the feedback type that matches your controller and tuning goals.
- Multiple mounting points – flexible installation options for mid-mounted EV projects beyond the Light Bee.
Controller Compatibility & Feedback Options
The TM25 is designed to work with Torp TC500 1.X/2.X and Torp TC1000 1.X/2.X motor controllers (inverters). For position feedback, it supports either Hall sensors or an encoder—helpful if you’re building for smooth low-speed control, crisp throttle response, or specific controller requirements.
Encoder resolution
When running the encoder option, the TM25 provides 1024 (4096) points of resolution for accurate rotor position tracking with Torp controllers.
Power & Voltage Overview
Whether you’re running a conservative 48 V setup or moving into higher voltage territory, TM25 scales with your system. Peak power depends on voltage, with published figures including:
- Up to 27 kW peak at 72 V
- Up to 31 kW peak at 80 V
- Up to 40 kW peak at 120 V
Technical Specifications
| Motor type | IPM (Interior Permanent Magnet) mid-drive traction motor |
| Application | Sur-Ron Light Bee electric off-road motorcycle (e-moto) |
| System voltage | 48–120 V |
| Continuous power | 13 kW |
| Peak power | Up to 40 kW (at 120 V); 27 kW (72 V); 31 kW (80 V) |
| Motor resistance | 3.4 mΩ |
| Position feedback | Hall sensor or encoder |
| Encoder resolution | 1024 (4096) points |
| Compatible controllers | Torp TC500 1.X/2.X, Torp TC1000 1.X/2.X |
Who this motor is for
If you’re searching for a Sur-Ron Light Bee motor upgrade that’s purpose-built for mid-drive performance—especially for higher voltage builds—the Torp TM25 is a premium option designed to deliver strong continuous output, efficient power transfer, and flexible sensor compatibility for modern controller setups.
