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 Jul 9, 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
| Date | Price | Shipping | Total | Change | Coupon | Rating | Sales | In Stock | Status |
|---|---|---|---|---|---|---|---|---|---|
Electrify Bike(22 records) | |||||||||
| Jul 9, 202603:47 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jul 7, 202604:21 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jul 5, 202603:54 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jul 3, 202603:01 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jul 1, 202603:45 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 29, 202604:56 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 27, 202603:38 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 25, 202610:01 AM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 23, 202609:58 AM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 21, 202608:59 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 21, 202610:48 AM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 19, 202603:00 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 17, 202610:37 AM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 15, 202602:11 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 13, 202602:12 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 12, 202609:31 AM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 3, 202605:55 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| Jun 2, 202605:42 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| May 31, 202605:27 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| May 30, 202612:49 PM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| May 27, 202609:55 AM | $525.00 | — | $525.00 | $0.00 | — | — | — | No | active |
| May 20, 202611:45 AM | $525.00 | — | $525.00 | Initial | — | — | — | No | active |
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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 |
