E-bike tuning - for e-bikes/pedelecs with BOSCH Generation 4


BOSCH - All drives manufactured by BOSCH eBike Systems since 2020 belong to Generation 4. The Performance Line CX, Cargo Line and Performance Line Speed are currently the most modern and sophisticated products on the market. Although there were attempts to restrict tuning with these drives, the tuning manufacturers quickly found ways to circumvent the locks again. There are also plenty of tuning options for the Generation 4 engines from BOSCH. All tuning tools for the 4th generation are downward compatible and run on 2nd and 3rd generation drives. They do not work with the Classic drives of Generation 1.

NOTE: The engines of generations 2 and 3 have been equipped with a new software version as of May 2019. If this software is active, the drives of these generations also need a Generation 4 tuning module.



Announced as "a new era for e-mountain bikers", the CX is BOSCH's most powerful drive unit. The motor itself dates from 2020, but a software update in 2021 brought the last out of this drive.

  • Year of manufacture: 2020

  • Generation: 4

  • Torque: 85 Nm

  • Up to 340 % motor assistance

  • Support up to 25 and 45 km/h (speed)


Finally, a drive unit that is perfectly adapted to cargo bikes. With 25 and 45 km/h support. A software update was also provided by BOSCH 2021 for this motor.

  • Year of manufacture: 2020

  • Generation: 4

  • Torque: 85 Nm

  • Up to 400 % motor assistance

  • Longer range thanks to DualBattery

  • Support from 25 and 45 km/h


The manufacturer from the Czech Republic has gained experience in the production of tuning chips since 2014. Its modules are installed directly on the engine and are suitable for all Generation 4 engines from BOSCH. The latest development is the SpeedBox 3.0 B.Tuning with its own app for the BOSCH drives.

The Italians are the only manufacturers of e-bike and pedelec motors who also offer tuning modules. For Generation 4 of the BOSCH drives, there are the High-Speed 2 tuning modules, which are installed directly on the motor and cannot be seen from the outside.


The Czech manufacturer builds tuning modules for the engines of many well-known manufacturers. They feature clever functions such as a chip lock, which is also built into the MSO 4.0 tuning module for the latest BOSCH engines. This allows the chip to be manually turned off and made invisible.

E-bike and pedelec tuning from Lower Franconia. The so-called Badass Box is not installed on the motor, but is simply attached from the outside and works with all Generation 4 motors up to 25 km/h. The Badass Box 4 is one of the most innovative products on the market.

TLI Elektronik GmbH from Ehekirchen in Bavaria offers state-of-the-art tuning modules for BOSCH Generation 4 engines under the label "VOLspeed". No PC or smartphone is required for these modules; all settings can be made via the various displays. Another special feature is the "dynamic mode", which mitigates the so-called "wall effect".


At SIP Scootershop we offer the following tuning modules for Generation 4:

These small boxes are plugged onto the sensor of the bike or pedelec and now this tool halves the transmitted speed, doubling the motor support. It is a wireless device that can be removed again in no time. The manufacturer Badass is the market leader here.

These small boxes contain a chip, are installed invisibly under the engine cover and clamped between the sensor and the control unit. The module can even be switched on or off via the display while driving. The latest modules, such as the Speedbox B, also have integrated app control via Bluetooth. The control and also the reading of the motor data can be done with the smartphone. However, tools are required for installation and removal. In the following, we will go into more detail about these modules.

The motors are controlled by a speed pulse that tells them how fast a pedelec or e-bike is travelling. If the pulse reaches 25 km/h, the motor switches off. However, if only every second signal of the impulse comes through, 50 km/h can be reached, because the motor is "fooled" into thinking it is travelling at a different speed. With cheap modules, the speedometer then simply displays half the speed.

More sophisticated chips are more advanced: they halve the impulse only from 23 km/h or, in some drives, they are directly connected to the data transmission between sensor and motor, so that the speedometer always shows the correct values. The most modern tuning modules, for example from VOLspeed or Speedbox, even display the total kilometres driven and average speeds correctly.

However, the software version of the bike and pedelec must also be kept in mind. A carelessly installed update from the manufacturer can abruptly end the tuning pleasure. Be careful, because the motor manufacturers and tuning experts are constantly playing a cat-and-mouse game.

Want to know more about e-bike tuning?

Here you'll find all the information you need on the subject: Finding the right tuning module.

And our FAQ on the subject of Speedbox and BOSCH.


It should be noted that the operation of this type of modified electric bicycle on public roads may be against the law in some countries. The dealer accepts no responsibility for any damage caused by the use of tuning products. Electric bicycles equipped with tuning products must not be used on public roads, cycle paths and squares. Electric bicycles equipped with tuning products may only be used on private property and at your own risk.