SpeedBox 3.2 B.Tuning for Brose (S-Mag Pro FIT)

Key features

SpeedBox 3.2 B.Tuning for Brose is a tuning chip designed specifically for e-bikes with Brose S-Mag Pro FIT motors. By removing the 25 km/h speed limit, you can fully enjoy the performance of your e-bike. SpeedBox Connect offers a unique connection between the e-bike and a smartphone.

Tuning control

Switching from the 25 km/h limit to unlimited mode and back

SpeedBox Connect

The B.Tuning version with Bluetooth connects your e-bike to a mobile phone

Easy installation

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

Compatibility

Motors: Brose S-Mag Pro FIT

Not compatible with: Enviolo Automatiq

Not compatible with e-bikes: without a connector in the display port, ABS

Technical specifications

Remote updates

Bosch regularly releases new firmware versions for its motors, which may affect compatibility with our products or increase the risk of tuning detection. Therefore, we strongly recommend not performing these updates in order to ensure the continued full functionality of our products.

However, we continuously respond to these changes by updating our firmware. One of the biggest advantages of the B.Tuning version is the ability to update your SpeedBox directly via the SpeedBox App – without the need to purchase a new chip, even if you have already updated the system.

If we have tested and confirmed compatibility with the latest Bosch firmware and your chip includes the so-called Factory Bootloader (the icon is marked on the back of the chip), you can safely update your SpeedBox via the app.

Installation

The installation is simple and intuitive. Choose the method that suits you best — video tutorial, printed manual, or a detailed step-by-step picture guide.

Video tutorial

A detailed installation and activation guide is available on our YouTube channel

Printed manual

The product package includes a printed manual with a wiring diagram for connecting the chip to the motor

Step by step

The illustrated guide walks you through installation step by step — from removing the motor cover to the test ride. Each step includes photos and a clear description.

Tuning control

You can activate the tuning in the SpeedBox Connection (Tuning off / Tuning on). Alternatively, you can enable it by double-pressing the LIGHT button. The display briefly shows 5 km/h (3 mph), which means tuning is active — from this moment there is no speed limit and your speed depends only on motor power and pedaling rhythm. Deactivate tuning the same way. The display shows 2 km/h (1 mph) and the bike returns to the original 25 km/h limit. Alternatively, tuning can be controlled using the + – + – button sequence.

Custom speed limit setting

SpeedBox allows you to set your own speed limit (for example to save battery). You can change the speed limit again in the SpeedBox Connect. Or on the controller switch to AUTO mode and then move 3× down and 3× up in this order: → STD → ECO → OFF → ECO → STD → AUTO. The display shows the current speed limit. Double-press LIGHT to increase the limit by 5 km/h each time. The last selected limit saves automatically after 5 seconds of inactivity. Note: The display does not show decimal points. For example, a displayed value of 3 km/h actually means 30 km/h, and after another double-press it becomes 35 km/h.

Warning

• Use of modified e-bikes is regulated differently in each country — always check local legislation before riding.

• SpeedBox is intended for off-road use only and is used at your own risk.

• The manufacturer is not responsible for damage caused by illegal or improper use.

• Installation may void your e-bike warranty.

• For your safety, use protective equipment and ride responsibly.