Badass Box 4 for Bosch "Slim-Set"

TYPE: Bosch Gen1, Bosch Gen2, Bosch Gen3, Bosch Gen4

VENDOR: Badass Box

159,00 €154,00 €

You Save: 5,00 € (4%)

Payment & Shipment
Customer reviews

Badass Box 4 for Bosch Slim Set

Important: You only need this set if the Bosch Slim Sensor is attached to the chainstay with the original adapter (first picture), or has been integrated into the dropout of your e-bike (second picture).

If the Bosch sensor (third picture) is mounted on your chainstay and easily accessible, you only need the normal Badass Box 4 for Bosch e-bike motors.

No more limits! The Badass Box 4 completely removes the 25 km/h speed limit of your Bosch motor, so you can finally use the full potential of your drive. If necessary, the original state of the e-bike can be quickly restored at any time.

This tuning tool is powered by an included AAA battery. The battery only needs to be changed about once a year, or after a distance of about 7,000 km (suitable replacement batteries can be found everywhere in stores).

Please note: When tuning is active (box connected), the e-bike display will functionally show an incorrect speed, which also applies to values derived from it. Our tip: Simply use GPS-enabled additional devices such as bike computers or your smartphone to display the actual speed. Suitable mounts for the handlebar are available at a reasonable price in our store.

Thanks to a special potting compound from the automotive industry, the Badass Box 4 is optimally protected against moisture and mechanical stress. Each Badass Box 4 is tested for correct function before and after potting.

It is the Badass Box a quality product, developed and manufactured in Germany.

The badassBox 4 Bosch Slim Set contains all the parts you need to attach the BadassBox 4 to your Bosch e-bike.

With this set, you not only have all the parts you need to tune your bike at the touch of a button, but you also save money.


The Bosch Slim Sensor is either mounted on the chainstay or integrated into the dropout.

Please note that a few modifications are necessary to install the Slim set. Please look at the installation instructions below first and only then decide if you want to order the product:

In this case, the slim speed sensor ("Slim Sensor") is classically mounted with an adapter on the chain stay. There, the sensor must be detached from the adapter. You have to unscrew the original adapter and replace it with the badass adapter.

Here again, the slim speed sensor ("Slim Sensor") is integrated near the rear axle. Therefore, you have to remove the complete rear wheel to install the tuning. Then you have to remove the sensor from the bracket and attach it, with the adapter by means of cable ties, at a suitable location on the chainstay.

Scope of delivery

The delivery includes the following parts:

1 Badass Box 4 Bosch

1Badass Box 4 housing cover

1 AAA battery

1 spoke magnet with knurled screw

1 slim adapter

1 base made of elastic foam

1 M5x10 cylinder head screw

1 washer

four cable ties

How it works

After installation, the Badass Box 4 transmits a modified signal to the engine, which cancels the preset 25 km/h speed limit. This happens contactless without any electrical connection to the motor, so no damage to the drive is possible.

Badass Box 4 for Bosch Slim-Set - Compatibility

E-bikes with Bosch mid-mounted motors: Classic Line, Active Line, Performance Line, CX Line & Active Line Plus (Gen1, Gen2, Gen3). Also compatible with Bosch Gen4 (model year 2020 / 2021). Not compatible with Bosch Smart System 2022 (BES3)!

Please note: It is not allowed to operate the Badass Box 4 on public roads or within the scope of the StVZO. This tuning tool may only be used on private property or for competition / testing purposes. If you install the Badass Box on your e-bike / pedelec, the warranty of your electric bike may expire. Use this tuning tool at your own risk and peril.

Payment & Shipment

Delivery time, Shipping costs, Minimum order value und Payment methods:

Delivery time

Delivery time is 1-8 business days within Germany. Postal delivery time outside Germany may take longer.

Shipping area

We ship to Belgium, Bulgaria, Denmark, Estonia, Finland, Germany, Greece, Ireland, Iceland, Italy, Croatia, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Austria, Poland, Portugal, Romania, Sweden, Slovakia, Slovenia, Spain, Czech Republic, Hungary, Cyprus.

For shipping to Germany please use our german shop.

For a solution to Switzerland and Liechtenstein please see here.

We do not ship to the USA, France, Canada (including all overseas territories) and generally outside the EU.

Shipping costs

The shipping costs for Germany are 3,50 Euro. The shipping costs are waived from an order value of 180 Euro. For countries within the EU the shipping costs are 9,90 Euro. The shipping costs are waived from an order value of 300 Euro. We ask you to cover the cost of any return shipment yourself. Please note that customs fees may apply in third countries outside the European Union.

Minimum order value

The minimum order value is 25 Euro. Only from this amount you can use prepayment or PayPal and bank transfer as payment methods.

Maximum order value

The maximum order value for orders outside the EU is 1.000 Euro. The maximum order value within the EU is 12.500 Euro.

Payment in advance bank transfer

Please transfer the total amount with your order number to our account which you received in the confirmation email. Please note that bank transfers within Germany can take up to three working days. Transfers from abroad, especially from Austria and Switzerland, usually arrive very quickly. From other countries, transfers can take a little longer on average.

Payment in advance Paypal

At the end of the order process you will be redirected to the page of Paypal. There you can initiate your payment. As soon as the Paypal transaction is completed, the status of your order will change in the store. The goods will then be shipped as soon as possible.


Comparison of e-bike tuning products




Badass Box

RedPed / BluePed /






Sx2 Dongle


Software (Module)
Box Module Module Module Module (Kit)
Module /
Module /
Range of functions ***** ***** * ***** **** *** *** *** *** / ** *

Easy installation of the tuning

***** ***** **** ** ** ** ** ** / * ** / * *

Invisible after installation

***** ***** * ***** ***** ***** ***** ***** ***** / **** ****

Switching on / off while riding

Gerät, Display
App, Display
(App), Display
Display, Magnet
***** / ****
Display /
Dongle, (Licht)

No more tuning Module at the bike

***** ***** ***** * * * * * * / **** ****

Invisible dismantling

***** ***** ***** ***** ***** ***** ***** ***** ***** / *** ***

Easy dismantling

***** ***** ***** ** ** ** ** ** / * ** / * *

Correct display of km/h

* *****
Display, App
Display, App
* ****


***** ***** ***** ***** ***** ***** ***** ***** ***** *****


* ***** * ***** ***** ***** ***** * * *

Price range in euros

169 to
189 to 299 149 to 154 219 to
159 to 179 139 to
139 to
89 to
89 to
139 to


Customer reviews

Important: Tuning measures on e-bikes and e-scooters mean that they are no longer permitted for use on public roads. Legally permissible use is therefore only possible on private property or - if permitted - in competitions. Driving an e-bike or e-scooter modified by tuning measures on public roads can lead to criminal liability for driving without a license as well as driving without insurance coverage. Tuning measures on the e-bike and e-scooter can lead to a loss of warranty rights and manufacturer warranties. In addition, tuning measures can lead to a loss of insurance coverage and accident victim assistance benefits in the event of accidents. The e-bike (or e-scooter) modified by tuning measures is exposed to an additional load due to the higher speed, which can lead to safety risks.

Badass Box 4 for Bosch "Slim-Set"

Badass Box 4 for Bosch "Slim-Set"

159,00 €154,00 €