SpeedBox 1.2 B.Tuning for Bosch (Smart System + Rim Magnet) - Package: BAG, Qty: 100 pcs + 16 free

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39 900 €
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Maximum speed: Unlimited (max 35 km/h recommended)
Display shows:
   Real speed: NO
   Correct travelled distance: After the countdown process is
Activation/deactivation (do not perform while riding):
   WALK function / - + - +
Indication of tuning activation/deactivation: YES (3.5/2.5 km/h)
Compatible with:
   All the Smart System displays
   All the Smart System motors (incl. SX motors)
   E-bikes that have a magnet attached to a valve (Bosch Rim Magnet)
   Latest Bosch software version
Not compatible with:
   Standard magnet
   ABS system

Bosch Smart System Software version 11.13.0 causes incompatibility with the products ordered before 05/2024.

Installation information
The ideal position of the Rim Magnet Simulator
lnstallation manual
Please check your e-bike type and motor space before purchasing the product

Product code: SB12BT_B_100+16pcs_BAG Shipping and Payment

The tuning with Bluetooth technology and mobile app for your e-bike with Bosch Gen4 motor and Smart System + "Rim Magnet". Enjoy your unlimited ride and all the great functions that our SpeedBox App has to offer.

SpeedBox 1.2 B.Tuning for Bosch brings a unique connection of e-bike and mobile phone and suppresses the speed limiter on your e-bike. 

The actual speed and other riding data will be displayed correctly in our SpeedBox App - right on the display of your phone.

How does SpeedBox 1.2 B.Tuning for Bosch work?

This tuning is very easy to control. You will activate SpeedBox 1.2 B.Tuning via mobile app or directly on your e-bike’s control unit by activating the WALK assist function shortly (holding down the “-” button). Your e-bike display will show a value of 3.5 km/h (2.2 mph) and from now on you will be able to ride up to 35 km/h or more. You may change the default speed limit to any limit you want (up to 99 kph), however, to minimize the risk of error codes, we recommend not to exceed 35 km/h.

To deactivate the tuning, activate the WALK assist function shortly again (by holding down the “-” button). Your e-bike display will show a value of 2.5 km/h (1.6 mph) and the speed limit will be reset to 25 km/h. Your e-bike will then work the same as before the tuning installation.

SpeedBox was also designed for e-bikes that do not have the WALK assist function enabled, or activated. In this case, you can activate/deactivate tuning by switching between two assistance modes twice, i.e. by pressing the - + - + buttons.

Activate/deactivate the tuning before the ride (when the e-bike is standing still), not during riding!

When you first open the SpeedBox App, you will be asked to type in a new PIN. This PIN will be requested each time you open the SpeedBox App. After confirming the PIN, you will be asked to set a service password. Your service password will be used in case you forget the PIN or want to change it.

You can set the maximum speed limit by switching the modes from TURBO mode three levels down and then three levels up: eMTB - TOUR+ - ECO - TOUR+ - eMTB - TURBO. An actual speed limit will be displayed after that. The maximum speed of an electric assistance can be switched by activating WALK assist function shortly or by turning the rear wheel 360°. The value of 2.5 km/h on the display corresponds with the limit of 25 km/h, 3.0 corresponds with 30 km/h, 3.5 corresponds with 35 km/h etc. The last displayed limit will be saved after 15 seconds of inactivity.

After finishing the ride, leave the bike on after finishing the ride until a value of 0.0 km/h is displayed. During this process the remaining time will be displayed. Then it is safe to turn off your bike and you can start looking forward to your next trip. Do not remove the display to lock the e-bike until SpeedBox finishes the "countdown" process.

SpeedBox App for SpeedBox 1.2 B.Tuning for Bosch

SpeedBox App is an application specially designed for SpeedBox B.Tuning, which uses Bluetooth technology to connect your e-bike to your mobile phone. After downloading the application and connecting your mobile phone to your e-bike you will see current data and trip parameters displayed on your phone. Individual trips can be stored so that the results can be compared with friends and together they can monitor their performance. So just enjoy the ride and leave checking the parameters for later!

SpeedBox App features:

  • Tuning control
  • Speed limit setting
  • Saving and viewing your trips
  • Invisible mode
  • Motor diagnostics

SpeedBox B.Tuning is not limited to working with SpeedBox App. However, it is a great tool that will provide you with a complete overview of your performances.

Download SpeedBox App to your phone just before ordering the SpeedBox B.Tuning chip. You can try out our demo version and get to know all the awesome features and, at the same time, make sure that the application is fully functional on your phone. To connect to the SpeedBox B.Tuning, your phone needs to be equipped with Bluetooth 4.0 or higher.

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We use original connectors for the production of SpeedBox products 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 10 km before the tuning is activated.


Connect the male - female connectors in the direction of the lock. Do not rotate the connectors during connection!


Detailed installation information can be found here.


Please note that the operation of this type of modified electric bike on public roads may be against the law in some countries. The manufacturer takes no responsibility for damages resulting from the use of 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 e-bike.

We strongly recommend using safety features and protective gear to prevent injuries.

If you lose your service password or pin, you can use our service available here.

We recommend not updating the firmware of your e-bike. Updating increases the risk of tuning detection.

Please disable automatic updates in the eBike Flow App.

When stopping for a short time, in order to continue riding smoothly, we recommend keeping one foot on the pedal so that the countdown does not start.

When stopping for a longer period of time, allow at least a partial countdown to take place.

After a long ride, the countdown may take several minutes.

Do not remove the display if the countdown has not been finished.

Activate/deactivate the tuning before the ride (when the e-bike is standing still), not during riding.

We recommend not to exceed a speed of 35 km/h.

Bosch Motor Gen 4 - Smart System (Rim Magnet)
Bluetooth/ SpeedBox App YES