SpeedBox 3.1 B.Tuning for Bafang M300, M400 & M420 (4-pin plugs)

TYPE: Bafang

VENDOR: Speedbox

309,00 €

Payment & Shipment
Customer reviews

SpeedBox 3.1 B.Tuning for Bafang (4-pin plug)

Comfortable e-bike tuning with app!

The SpeedBox 3.1 tuning module completely removes the 25 km/h speed limit of Bafang Max Drive M300, M400 and M420 e-bike motors with 4-pole plug-in connection. This allows you to use the full potential of these drives, completely without limits.

As this is the "B-Tuning" version of the SpeedBox 3.1, the module is also compatible with the practical SpeedBox app. This allows you to benefit from numerous useful additional options (see below) that considerably expand the module's range of functions.

There is even the option to set the maximum speed yourself. This can be done conveniently via the app, but alternatively the tuning can also be controlled using the control buttons of the e-bike.

With SpeedBox 3.1, the e-bike displays real data, such as the current speed - regardless if the tuning has been activated or not.

Advantages of the SpeedBox 3.1 B.Tuning module at a glance

-Removal of the 25 km/h speed limit.

-Compatible with the SpeedBox app.

-Maximum speed can be set individually: The maximum supported speed can be set by switching the mode down three levels and then up three levels again. Then the current speed limit is displayed. Now the maximum speed can be set by briefly pressing the LIGHT button or by turning the rear wheel 360°. The last speed limit displayed will be saved after 5 seconds of inactivity.

-Correct values in the e-bike display: Even when tuning is switched on, the e-bike display shows correct values (speed, maximum and average speed, range, daily distance, etc.).

-Tuning can be switched on and off: The SpeedBox 3.1 can be conveniently activated / deactivated using the control buttons at the e-bike display. To switch on tuning, either press the LIGHT button or + - + -. The display then briefly shows 99 km/h - this signals that the tuning module has been switched on and the speed limit has been lifted. Pressing the LIGHT button again deactivates the tuning. A short display of 25 km/h will indicate that the tuning module has been switched off and that the maximum supported speed ends at 25 km/h again. The e-bike then functions again as if no tuning chip had been installed.

-The SpeedBox 3.1 B.Tuning Chip does not require its own battery.

SpeedBox App

This "B.Tuning" version of the SpeedBox 3.1 Tuning Chip can be connected via Bluetooth to the specially developed SpeedBox App. This allows you to monitor your performance precisely. You can, for example, display extensive riding parameters and data on your smartphone, save individual rides and compare them with friends, etc. By the way, the parameters displayed by the SpeedBox app are extremely accurate, as they come directly from the control unit of the e-bike. But the app's range of functions goes far beyond that:

-Tuning control (activate / deactivate tuning)

-Setting the speed limit (maximum speed)

-Display various parameters, e.g. speed, distance, battery, range, power, energy, torque, etc.

-Save and display ride data

-Hide tuning (the tuning chip can then temporarily no longer be switched on via the bike's control buttons)

-Engine lock (temporarily switch off the engine)

-Engine diagnosis

Note: All relevant functions of the SpeedBox Tuning Chip can also be controlled without the app (switch tuning on and off / set maximum speed etc.). However, the app is a very practical accessory that considerably expands the range of functions of the tuning module.

Tip: Before ordering the SpeedBox 3.1 B.Tuning Chip, download the SpeedBox App first. Test the demo version to get to know the functions of the app. This way you can also make sure that the app is fully functional on your smartphone.


SpeedBox 3.1 B.Tuning is a chip or module that needs to be connected to the engine's plug connections. Thanks to the marked connectors, installation is simple and can be done by yourself. Use the illustrations below as a guide when connecting the module.

You can remove the SpeedBox module at any time if you want to restore your Bafang e-bike to its original condition.

Important notes:

-If you install the SpeedBox 3.1 B.Tuning in a brand new Bafang e-bike, you must first ride the bike for at least 1 km before activating the tuning for the first time.

-If you want to update the software of your Bafang e-bike, you must first uninstall the SpeedBox from the e-bike. Update the software, then reinstall the SpeedBox.

SpeedBox 3.1 B.Tuning for Bafang (4-pin plug) - Compatibility

This tuning tool is compatible with the following e-bike drives (with 4-pole pins on the speed sensor):

-Bafang Max Drive M300

-Bafang Max Drive M400

-Bafang Max Drive M420

Not compatible with Bafang Max Drive M500.

SpeedBox 3.0, 3.1 and 3.2 (B.Tuning) modules for Bafang are compatible with motors using the CAN protocol, but not with motors using the UART protocol. The CAN or UART protocol can be distinguished by the shape of the connectors.

Compatible with the SpeedBox app (Bluetooth 4.0 or higher required).

Payment & Shipment

Delivery time, Shipping costs, Minimum order value und Payment methods:

Delivery time

Delivery time is 1-8 business days within Germany. Postal delivery time outside Germany may take longer.

Shipping area

We ship to Belgium, Bulgaria, Denmark, Estonia, Finland, Germany, Greece, Ireland, Iceland, Italy, Croatia, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Austria, Poland, Portugal, Romania, Sweden, Slovakia, Slovenia, Spain, Czech Republic, Hungary, Cyprus.

For shipping to Germany please use our german shop.

For a solution to Switzerland and Liechtenstein please see here.

We do not ship to the USA, France, Canada (including all overseas territories) and generally outside the EU.

Shipping costs

The shipping costs for Germany are 3,50 Euro. The shipping costs are waived from an order value of 180 Euro. For countries within the EU the shipping costs are 9,90 Euro. The shipping costs are waived from an order value of 300 Euro. We ask you to cover the cost of any return shipment yourself. Please note that customs fees may apply in third countries outside the European Union.

Minimum order value

The minimum order value is 25 Euro. Only from this amount you can use prepayment or PayPal and bank transfer as payment methods.

Maximum order value

The maximum order value for orders outside the EU is 1.000 Euro. The maximum order value within the EU is 12.500 Euro.

Payment in advance bank transfer

Please transfer the total amount with your order number to our account which you received in the confirmation email. Please note that bank transfers within Germany can take up to three working days. Transfers from abroad, especially from Austria and Switzerland, usually arrive very quickly. From other countries, transfers can take a little longer on average.

Payment in advance Paypal

At the end of the order process you will be redirected to the page of Paypal. There you can initiate your payment. As soon as the Paypal transaction is completed, the status of your order will change in the store. The goods will then be shipped as soon as possible.


Comparison of e-bike tuning products




Badass Box

RedPed / BluePed /






Sx2 Dongle


Software (Module)
Box Module Module Module Module (Kit)
Module /
Module /
Range of functions ***** ***** * ***** **** *** *** *** *** / ** *

Easy installation of the tuning

***** ***** **** ** ** ** ** ** / * ** / * *

Invisible after installation

***** ***** * ***** ***** ***** ***** ***** ***** / **** ****

Switching on / off while riding

Gerät, Display
App, Display
(App), Display
Display, Magnet
***** / ****
Display /
Dongle, (Licht)

No more tuning Module at the bike

***** ***** ***** * * * * * * / **** ****

Invisible dismantling

***** ***** ***** ***** ***** ***** ***** ***** ***** / *** ***

Easy dismantling

***** ***** ***** ** ** ** ** ** / * ** / * *

Correct display of km/h

* *****
Display, App
Display, App
* ****


***** ***** ***** ***** ***** ***** ***** ***** ***** *****


* ***** * ***** ***** ***** ***** * * *

Price range in euros

169 to
189 to 299 149 to 154 219 to
159 to 179 139 to
139 to
89 to
89 to
139 to


Customer reviews

Important: Tuning measures on e-bikes and e-scooters mean that they are no longer permitted for use on public roads. Legally permissible use is therefore only possible on private property or - if permitted - in competitions. Driving an e-bike or e-scooter modified by tuning measures on public roads can lead to criminal liability for driving without a license as well as driving without insurance coverage. Tuning measures on the e-bike and e-scooter can lead to a loss of warranty rights and manufacturer warranties. In addition, tuning measures can lead to a loss of insurance coverage and accident victim assistance benefits in the event of accidents. The e-bike (or e-scooter) modified by tuning measures is exposed to an additional load due to the higher speed, which can lead to safety risks.

SpeedBox 3.1 B.Tuning for Bafang M300, M400 & M420 (4-pin plugs)

SpeedBox 3.1 B.Tuning for Bafang M300, M400 & M420 (4-pin plugs)

309,00 €