Tongsheng TSDZ2B OSF Upgrade Motor (250-750W)
Torque-sensing BB-mount mid-drive motor based on the Tongsheng TSDZ2B platform, shipping pre-flashed with the community Open Source Firmware (OSF) for highly configurable performance. It fits standard 68-73mm threaded bottom brackets and uses an integrated torque-and-cadence sensor for natural, proportional pedal assist. OSF enables advanced FOC motor control, a 24-60V battery range, throttle and walk-assist support, and multi-display compatibility (e.g. Bafang 860C color LCD) with up to 19 assist levels and 9 boost levels configurable on the display.
In brief: 250W mid-drive motor. Fits 68–73mm bottom bracket. 24–60V rated.
Specs verified Oct 16, 2026
Where to Find
Prices tracked across 1 sellerPrice History
Current best price $525.00. Over the past 90 days: low $525.00, high $525.00, average $525.00 — about average.
- Electrify Bike
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Specifications
Performance
- Wattage
- 250W
- Peak Wattage
- 750W
- Rated Voltage
- 24–60V
- Max Torque
- 80.00Nm
Fitment
- Bottom Bracket Width
- 68mm – 73mm
Features
- PAS Sensor Type
- Torque
- Temp Sensor
- None
Physical
- Weight
- 3.6 kg
Ports & Connectors
| Pin | Wire color | Function |
|---|---|---|
| 1 | Blue | Battery + |
| 2 | Black | Ground |
| 3 | Red | Power Switch Signal |
| 4 | Brown | UART TX |
| 5 | Yellow | UART RX |
| 6 | Green | Brake Signal (Low) |
| 7 | White | 5V Power |
| 8 | Orange | Throttle Signal |
| Pin | Wire color | Function |
|---|---|---|
| 1 | No color | None |
| 2 | Brown | 5V Power |
| 3 | Green | Low Beam |
| 4 | Orange | Ground |
| 5 | No color | None |
| 6 | White | Speed Signal |
