SpeedBox 3.1 for Bafang (4 pin connector) - Package: BAG, Qty: 10 pcs + 1 free

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PROPERTIES:
Activation: LIGHT button / + - + -
Maximum speed: unlimited
Speed limit setting: yes
Display shows: actual values
Compatible with motors :
   Bafang Max Drive M300
   Bafang Max Drive M400
   Bafang Max Drive M420
Not compatible with:
  Automatic gear shifting
   Bafang Max Drive M500
   SpeedBox Connect
   Displays with UART connectors
More

Product code: SB31_BAF_10+1pcs_BAG Shipping and Payment

Key features

SpeedBox 3.1 is a smart third-generation tuning chip with an option to set your own speed limit for e-bikes with Bafang Max Drive motors with a 4 pin connector. You can check the number of pins in your connector on the image in the Printed manual section below. It removes the 25 km/h speed limit so you can enjoy riding at unlimited speed, while the display keeps showing real values such as maximum and average speed, daily mileage and cruising range.

Tuning control

Switching from the 25 km/h limit to unlimited mode and back with the LIGHT button or the ↑↓↑↓ combination

Real values on the display

The display keeps showing maximum and average speed, daily mileage and cruising range

Easy installation

Thanks to clear instructions including a video, anyone can handle the installation

Compatibility

Bafang Max Drive motors: M300, M400, M420 (4 pin connector — see the image in the Printed manual section below)

Not compatible with: Bafang Max Drive M500, automatic gear shifting, displays with UART connectors

Technical specifications

Maximum speed	Unlimited
Display shows	Real values
Custom speed limit	Adjustable (in steps of 5 km/h)
2 activation / deactivation methods	LIGHT button / ↑↓↑↓ button combination
Minimum ride distance before installation	10 km (new bike)

Installation

Installing the device is easy and intuitive. Choose the option that suits you best – a video guide, a printed manual, or a detailed step-by-step picture guide.

Video guide

Detailed installation and tuning activation procedure for e-bikes with Bafang Max Drive motors

Printed manual

Inside the product package you will find a printed manual including a wiring diagram for connecting the chip to the motor. The third image shows the 4 pin connector, so you can check your motor before buying

Step by step

The illustrated guide will walk you through the installation step by step — from removing the motor cover to the test ride. Each step is accompanied by photos and clear explanations.

User Manual →

Tuning control

You activate the tuning directly on the e-bike's display. After pressing the LIGHT button or the ↑↓↑↓ combination, the display shows a value of 99 km/h (62 mph) and from that moment on you can ride at an unlimited speed.
You deactivate the tuning by pressing the LIGHT button or ↑↓↑↓ again — the display will show 25 km/h (16 mph), the speed limit resets to 25 km/h and the e-bike works the same as before the tuning was installed.

Setting a custom speed limit

You can set the maximum assistance speed by switching the modes three levels down and then three levels up.
The current speed limit will then appear on the display. You switch the limit by briefly pressing the LIGHT button or by turning the rear wheel 360°.
The last displayed limit is saved after 5 seconds of inactivity.

Warning

Rules for using derestricted e-bikes vary by country, so check local legislation before riding.
SpeedBox is intended for off-road use only and you use it at your own risk.
The manufacturer is not liable for damage caused by illegal or improper use.
Installation may also void your e-bike warranty.
For your safety, use appropriate protective gear and ride with maximum caution.