SpeedBox 3.1 B.Tuning for Brose - Package: BOX, Qty: 1 pcs

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SpeedBox 3.1 B.Tuning for Brose – E-bike tuning chip with Bluetooth and SpeedBox App

SpeedBox 3.1 B.Tuning for Brose – product box of the E-bike tuning chip with Bluetooth and SpeedBox App

SpeedBox 3.1 B.Tuning for Brose – connection of the E-bike tuning chip with Bluetooth and SpeedBox App to the motor

SpeedBox 3.1 B.Tuning for Brose - Package: BOX, Qty: 1 pcs

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SpeedBox Connect

Tuning chip for e-bikes with Brose, Specialized and SRAM systems
Unlock the 25 km/h speed limit and enjoy the full power of your e-bike!

Bluetooth • SpeedBox Connect

Compatible with:
Brose motors (Specialized, S-MAG, S, T, C, T-ALU)
SRAM Powertrain by Brose

Not compatible with:
Brose Remote Control
e-bikes without a connector in the display port (usually only a blank plug)
ABS

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Product code: SB31BT_BRO_1pcs_BOX Shipping and Payment

Key features

SpeedBox 3.1 is a smart third-generation tuning chip for e-bikes with Brose and Specialized units, including the SRAM Powertrain unit. It removes the 25 km/h speed limit and allows riding at an almost unlimited speed, which depends only on your pedaling cadence.

Tuning control

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

Adjustable speed limit

Set your own maximum assistance speed in steps of 5 km/h

Easy installation

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

Compatibility

Motors: S-MAG, S, T, C, T-ALU, Specialized

Also compatible with: SRAM Powertrain by Brose

Not compatible with: Brose Remote Control, e-bikes without a connector in the display port (usually have only a blanking plug)

Technical specifications

Maximum speed	Unlimited (depends only on pedaling cadence)
Custom speed limit	Adjustable (on the display; with SRAM Powertrain in the SRAM AXS app)
2 activation / deactivation methods	WALK function / + − + − 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 (standard)

Installation and tuning activation procedure for e-bikes with Brose and Specialized motors

Video guide (SRAM Powertrain)

Installation and tuning activation procedure for e-bikes with the SRAM Powertrain unit

Printed manual

Inside the product package you will find a printed manual including a wiring diagram for connecting the chip to the motor

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 (Brose, Specialized)

You can activate tuning directly on the e-bike's display by briefly activating the WALK function.
The display will briefly show a value of 99 km/h (62 mph), indicating that tuning is active — from this point on you can ride at 40 km/h, 50 km/h, or even more than 60 km/h.
You deactivate tuning the same way — the display will show 25 km/h (16 mph) and the e-bike will return to its original speed limit.
If you don't have a classic control unit with the WALK function, you can control tuning using the + − + − button combination.

Setting a custom speed limit

You can set the maximum assistance speed on the display by gradually switching modes: TURBO → TRAIL → ECO → OFF → ECO → TRAIL → TURBO.
The current speed limit will then be displayed. Switch the limit by briefly activating the WALK function or turning the rear wheel 360°. The speed increases by 5 km/h each time.
The last displayed limit is saved after 5 seconds of inactivity.

The speed indication in the Specialized Mission Control app is not functioning correctly. If you have a TCU without a display on your e-bike, we recommend purchasing the B.Tuning version compatible with the SpeedBox Connect app.

Tuning control (SRAM Powertrain)

You activate or deactivate tuning by briefly activating the WALK function, or by switching between two assistance modes using the + − + − buttons.
Activating tuning (unlimited speed) → the display will show a battery value of 99%, which corresponds to a maximum speed of 99 km/h.
Deactivating tuning (limited speed) → the display will show a battery value of 25%, which corresponds to a speed limit of 25 km/h.

Setting the maximum assistance speed

You set a custom maximum speed in the SRAM AXS app, in the Ride Modes section. Here you adjust the Max Power parameter for individual modes — first decrease it three times, then increase it three times. The controller will briefly display the current speed limit as a battery percentage.
Then, using the WALK function, gradually set the maximum speed — each press increases the battery value by 5%, which corresponds to raising the speed limit by 5 km/h. For example, a value of 55% means a 55 km/h limit, 60% means 60 km/h, and so on.
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.