Badass Box 4 (G4-Set) for Bosch

Badass Box 4 for Bosch G4 Set

A tuning set especially for Trek e-bikes with Bosch mid-motors and G4 speed sensor integrated in the dropout. The set contains the Badass Box 4 and all parts necessary for installation.

The Badass Box 4 is a proven tuning tool that completely removes the 25 km/h speed limit of Bosch e-bike motors. This allows you to use the full potential of your Bosch drive and ride much faster with full motor support. This is so-called contactless tuning - i.e. there is no electrical connection to the motor, so there is no risk of damage to the drive.

The tuning works by the Badass Box 4 transmitting a modified signal to the motor after installation and plugging in. This overrides or removes the preset 25 km/h limit - and you can ride much faster with full motor support.

Important note: Due to this functional principle, the e-bike display will show a wrong speed when tuning is active (=box is plugged in), which also applies to values derived from it. We recommend using GPS-based additional devices such as smartphones to determine the real speed and correct distance. You can attach these directly to the handlebars of your e-bike. You can find suitable mounts "here".

If necessary, the tuning tool can be removed at any time and the e-bike returned to its (legal) original condition.

The Badass Box 4 is powered by an AAA battery with a long range (included in delivery). Suitable replacement batteries can be found inexpensively almost everywhere in the trade. They can be replaced at any time without any problems, and you don't even need any tools. It is recommended to replace the battery once a year at the start of the season.

Tuning can be switched on and off

After installation or wiring, you can switch the tuning on and off at any time by plugging or unplugging the box and moving the spoke magnet. Thanks to a patented snap lock and the supplied spoke magnet with lobe screw, this is now even quicker and easier than ever before.

Please note that the installation of the Badass Box requires a small modification - so a little manual work is needed here. Therefore, please read the installation instructions below before ordering the Badass Box 4 for Bosch G4 set.

BadassBox 4 for Bosch - The most important information at a glance:

-25 km/h speed limit of Bosch motors is completely removed.

-Contactless e-bike tuning.

-Patented snap lock allows the box to be plugged in and unplugged within a few seconds.

-Badass box attached & spoke magnet moved: Tuning activated - the 25 km/h limit of the motor support is lifted.

-Badass box unplugged and spoke magnet moved back to original position: Tuning cancelled, motor support then stops again, as usual, at 25 km/h.

-Replaceable 1.5V AAA battery (IEC R03) with long range, partly due to patented field amplification technology.

-Thanks to potting compound from the automotive industry, the Badass Box 4 is very robust and well protected against moisture.

-Double quality control (before and after potting).

-Dimensions: 61 x 43 x 15 mm

-Weight: Badass Box 27g (with battery 37g)

-Developed and manufactured in Germany.

Installation instructions

You will find the integrated G4 speed sensor in the area of the dropout of your e-bike. To access the sensor, the rear wheel must be removed:

In the scope of delivery you will find a lens flange screw with which you can screw the G4 speed sensor to the G4 adapter (you will need a 2.5 mm hexagonal spanner / Allen key):

Optionally, a suitably cut pad made of self-adhesive elastic foam is enclosed. You can stick this pad to the G4 adapter so that you can attach it to the swingarm without risk of scratches:

Now you have to fix the G4 adapter incl. the screwed-on G4 speed sensor with the help of the enclosed cable tie at a suitable place on the swingarm where it is possible to slide the Badass Box onto the adapter.

Now you have to reinstall the rear wheel and push the Badass Box onto the adapter until it clicks into place:

Now all you have to do is mount the spoke magnet and align it with the edge of the Badass Box housing - that's it, your e-bike is tuned!

Badass Box 4 for Bosch G4 set - Compatibility

Trek e-bikes with any of the following Bosch mid-mounted motors:

Active Line, Performance Line, CX Line & Active Line Plus.

Also compatible with 4th generation Bosch e-bike mid-motors (2020/2021 vintage).

Not compatible with Bosch Smart System 2022!

Important note:

This Badass Box 4 is only compatible with the G4 Speed Sensor in the dropout shown here:

If the sensor integrated in the dropout has the shape of the second sensor, you will need the "Badass Box 4 Bosch X-Set":

If the Bosch sensor (the second one) of your e-bike is easily accessible on the chain stay and has the shape of the second sensor, you only need the usual "Badass Box 4 for Bosch e-bike motors".

Tip: Bosch Smart System e-bikes (BES3) can be easily recognised by the charging cable plug, among other things.

SQUARE plug = Bosch Smart System BES3 (Gen4) + Bosch Gen5:

ROUND plug = Bosch Gen2, Gen3 & Gen4:

If your Bosch e-bike charging cable has a round plug (as shown above), you have selected the correct tuning module (provided the bike does not have ABS). If your Bosch e-bike does not have either connector, you either do NOT have a Bosch e-bike or an e-bike with the old Gen1 drive (Classic Line).

Badass Box 4 for Bosch G4 Set - Scope of delivery

1x Badass Box 4 for Bosch

1x Badass Box 4 housing cover

1x spoke magnet with lobe screw

1x G4 adapter

1x lens flange screw [M3 x 8 (ISO 7380-2)]

1x Elastic foam pad

4x cable tie