SpeedBox 1.3 for Bafang M300 M400 M420 (4 pin connector)

Basic tuning kit for e-bikes with Bafang motors.

SpeedBox 1.3 enables you to double the speed limit of an e-bike from the original 16 mph (25 km/h) to 31 mph (50 km/h). When in use, the actual speed will appear on your display up to 14mph (23 km/h). The display also shows your trip and other aspects of your ride.

Note: The Speedbox App is an application specially designed for Speedbox B. Tuning products only. With a non-Bluetooth Speedbox product like this one, the Speedbox App is unavailable.

SpeedBox 1.3 B.Tuning for Bafang (4 pin conector)

The tuning kit manipulates the speed signal without altering the motor's power relative to pedaling speed. This guarantees a smooth motor control without speed limit interruptions. Depending on a tuning kit, some determine when assistance stops, while others remove the restriction entirely for continuous support. However, the achievable speed mostly depends on the eBike model. Achievable speed can be calculated using a simple formula:

Speed = Cadence [rpm] * Wheel circumference [mm] * Front Chainring Teeth / Rear Chainring Teeth * 60 [min/h] / 1.000.000 [mm/km]

SpeedBox 1.3 tuning kit can be activated on the e-bike’s control unit. After pressing the LIGHT button, the active lights icon will be displayed shortly after which you will be able to ride at a speed of 31mph (50 km/h). The chip is deactivated by pressing the LIGHT button again.

By attaching the Light cable for Bafang, you can use the SpeedBox and your lights at the same time.

This tuning kit is compatible with motors:
- Bafang Max Drive M300
- Bafang Max Drive M400
- Bafang Max Drive M420

In case of updating the software of your e-bike, uninstall SpeedBox from the e-bike first, update the software and reinstall SpeedBox.

If your ebike is with 3 Pin connector, you would need Speedbox 1.2 for Bafang or Speedbox 1.2 B.Tuning for Bafang

We use original connectors for the production of SpeedBox chips ensuring that the installation process is very simple and the chip is connected properly. We have also prepared detailed instructions and videos to make installation easy for you. Disassembly of the tuning chip is just as easy. If you have any troubles with installation or disassembly, do not hesitate to contact us.

If you are planning to install SpeedBox on a brand-new bike, make sure you ride it for at least 0.6 miles (1 km) before the chip is activated.

Installation Guide:

Please note that the operation of this type of modified electric bikes on public roads may be against the law in some countries. The manufacturer takes no responsibility for damages resulting from the use SpeedBox products. Electric bikes equipped with SpeedBox products are not allowed to be used on public roads, cycling paths and public places. Electric bikes equipped with SpeedBox products can be used exclusively on private property and entirely at one’s own risk.

The use of SpeedBox may void the warranty of your ebike.

We strongly recommend using other safety features and protective gear to prevent injuries in higher speeds.

SpeedBox Products are thoroughly tested and we stand by their quality. SpeedBox provide Life Long warranty to all their Products!

If You have any questions, please do not hesitate to contact us. Thank you for looking! Two Wheels Empire Team

Warranty does not cover damage resulting from eBike software updates. Remove the tuning kit before updating the software. Check with us first to ensure the kit is compatible with your updated eBike. We cannot guarantee that the kit will function the same after updates. Please exercise caution. If your Speedbox tuning kit needs updating due to updated eBike software, please contact us at Contact us. Preliminary costs are 49£ + shipping costs.