SpeedBox 1.2 for Bosch (Smart System + Rim Magnet)

Derestrict your e-bike for 22mph (35 km/h) speed

Compatible with all Bosch Smart System with Rim Magnet. Also works with Bosch SX and CX motors. Not compatible with with e-bikes with Bosch ABS system and regular magnets. Maximum speed: 35 km/h recommended. The module now supports drive unit software version up to 11.13.0 . Further updates are not supported.
ATTENTION: Not all eBikes have space in the motor housing for the magnet simulator due to construction differences. If there is not enough space for the magnet simulator, the installation of this tuning kit is impossible. Please watch the installation video before ordering.

Regular price£306.00

&Free Delivery Worldwide.

You can save money when buying more than one tuning kit. Can be combined with other brand/type tuning kits!
Buy 2 save £9.18
£306.00 £296.82
Buy 3 save £21.42
£306.00 £284.58


- TOM E.

easy to install EASY TO INSTALL

Main Product Information

Tuning module for the Bosch Smart System with Rim Magnet. Compatible with all Bosch drive systems that are equipped with the Smart System and Rim Magnet whose motor support ends at 25km/h (15.5mph) from the factory. Does not work with ABS system and normal spoke magnet bikes.

Note: The Speedbox App is an application specially designed for Speedbox B. Tuning products only. With a non-Bluetooth Speedbox product like this one, the Speedbox App is unavailable.

SpeedBox 1.2 B.Tuning for Bosch (Smart System + Rim Magnet)

The tuning kit manipulates the speed signal without altering the motor's power relative to pedaling speed. This guarantees a smooth motor control without speed limit interruptions. Depending on a tuning kit, some determine when assistance stops, while others remove the restriction entirely for continuous support. However, the achievable speed mostly depends on the eBike model. Achievable speed can be calculated using a simple formula:

Speed = Cadence [rpm] * Wheel circumference [mm] * Front Chainring Teeth / Rear Chainring Teeth * 60 [min/h] / 1.000.000 [mm/km]

To activate all the functions of the SpeedBox correctly, it is necessary to enter the menu after the first switching on of the e-bike after the tuning installation and switch to the circumference of the wheel of your e-bike.

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

You will activate the SpeedBox 1.2 tuning 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.

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.

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 e-bike on for a while until the SpeedBox finishes the "countdown" process (the ride time will continue on the display until it stops and shows the correct distance traveled) to prevent tuning detection on your e-bike.

This tuning kit is compatible with Bosch Smart System with Rim Magnet with the drive unit software versions up to 11.13.0. Also works with Bosch SX and CX motors. Not compatible with with e-bikes with Bosch ABS system and regular spoke magnets.

When connecting Tuning Kit to an e-bike you will find connectors colored to make installation very simple. We have prepared detailed instructions to make installation easy for you. Disassembly of our tuning kit 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 0.6 miles (1 km) before the tuning kit is activated. Also, please refer to the magnet simulator image when installing this tuning kit

Installation Guide:

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

We strongly recommend using other safety features and protective gear to prevent injuries in higher speeds.
Speedbox Products are thoroughly tested and we stand by their quality. Speedbox provide 2 years warranty to all their Products!

Warranty does not cover damage resulting from eBike software updates. Remove the tuning kit before updating the software. Check with us first to ensure the kit is compatible with your updated eBike. We cannot guarantee that the kit will function the same after updates. Please exercise caution.

Unlock the full potential of your ebike!

  • You will ride faster and experience the thrills of owning a derestricted ebike -you will love the difference!
  • Install it effortlessly- quick plug-and-play connection - no setup required.
  •  Feel safe for your e-bike and warranty- it's safe for ebike and undetectable to keep your warranty safe!

SpeedBox 1.2 for Bosch (Smart System + Rim Magnet)
SpeedBox 1.2 for Bosch (Smart System + Rim Magnet)

Quick plug-and-play installation. No setup!

  • Increase the speed limiter from original 16 mph (25km/h) to 22 mph (35 km/h)!
  • Enable/disable when needed! Just press ' - + - +' sequence or WALK button
  • Get after-sales support from us and lifetime warranty from Speedbox


The bike feels completely different once derestricted - it's just like a whole different bike! The rides are so much more fun now! Tuning kits are safe to your bike and every ebiker should have one installed! You will love riding your ebike with it - guaranteed!

Matt - Owner of Two Wheels Empire

What Our Clients Say About It?

Who Are We?

From Riders to Riders

In Two Wheels Empire, we trust in innovation, premium quality and sustainability - that's what our business is about. Feel assured all our ebike products are carefully selected and we stand by them: if it's on offer here at Two Wheels Empire - it's been tested and selected by our team. Riders working with us are here to help you enjoy your ebike rides!

We are here to build an Empire, of people who strive for freedom, thrills and adventure, it's about time to make the best of your rides!