THE SpeedBox 3.0 B.Tuning is a release module designed for electric bikes equipped with motors Bafang Max Drive M300 or M400 with 3 pin connector. It removes the 25 km/h assistance limit, allowing assistance up to around 35 km/h, while retaining the correct speed and distance data on the bike display.
Activation and deactivation can be done via the function WALK, a specific key sequence on the bike, or via the app SpeedBox App via Bluetooth, which also allows you to customize certain module parameters.
Highlights
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Removal of the assistance limit of 25 km/h.
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Flexible activation/deactivation via WALK function, key sequence or Bluetooth app.
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Correct display of speed, distance and autonomy on the bike screen.
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Plug & play installation with original connectors.
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Control and customization of settings via the SpeedBox App.
Technical description
| Specification | Detail |
|---|---|
| Type of use | Tuning e-bike Bafang Max Drive M300 / M400 (private use recommended) |
| Engine compatibility | Bafang M300 / M400 with 3 pin connector |
| Screen compatibility | Compatible Bafang screens |
| Activation | WALK function, key sequence ↑↓↑↓, or via SpeedBox App |
| Activation indication | Display of 3.5 km/h briefly |
| Deactivation indication | Display of 2.5 km/h briefly |
| Recommended max speed | Unlimited (≈ 35 km/h recommended) |
| Actual speed display | Yes |
| Correct distance | Yes, after the countdown at the end of the journey |
| Facility | Plug & play with original connectors |
| Practical notes | Do not activate/deactivate while driving; leave the bike powered on until 0.0 km/h before turning it off |
| Incompatibilities | Not compatible with standard sensor (non 3 pin), ABS systems |





