The Bafang M820 is an ultra-light CAN-bus torque-sensing OEM mid-drive for lightweight eMTBs. Rated 250W with 80 Nm of torque, it spins up to 120 RPM cadence, runs 36–48V, and weighs just 2.3 kg — the lightest in the M-series. It uses the Bafang CAN protocol over a triangle connector and is NOT compatible with UART BBS displays. IPX6. Crank interface is a standard ISIS spindle (carbon and alloy aftermarket cranks fit) on a 104 BCD 4-bolt spider accepting 32–40T chainrings; it requires a purpose-built frame with motor mounting tabs and is not retrofittable to a standard BB-shell bike.
In brief: 250W mid-drive motor. 36–48V rated. From $665.
Specs verified Jun 5, 2026
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Specifications
Performance
- Wattage
- 250W
- Rated Voltage
- 36–48V
- Max Torque
- 80.00Nm
Features
- PAS Sensor Type
- Torque
- Temp Sensor
- None
Physical
- Weight
- 2.3 kg
- IP Rating
- IPX6
Ports & Connectors
| Pin | Wire color | Function |
|---|---|---|
| 1 | Brown | Battery + |
| 2 | Orange | 5V Power |
| 3 | Black | Ground |
| 4 | White | CAN Low |
| 5 | Green | CAN High |
