Best Bosch Cx Tuning 2026

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Last Updated - 22.07.2026

Best Choice

01

Badass eBikes

Badass eBikes BadassBox 5 Contactless eBike Tuning Set for Bosch BDU 38 Smart System / Gen5 with App

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9.8

Exceptional

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The badassBox must not be operated in road traffic or in the area of effect of the German Road Traffic Regulations. Use is only permitted on private premises. Before using the badassBox, check whether and how the use is permitted by you.
Not compatible are eBikes with integrated ABS system or spoke magnet
Includes dedicated app to display the current speed, set the desired tuning mode and much more
Easy installation possible with simple tools and just as easy to return to its original condition
Completely remove the speed limit
Compatible with the Bosch Smart System "Gen5" for engines of type Performance Line CX (BDU 38/model year 2025) with rim magnet

249,00 €
02

VOLspeed

VOLspeed V2 for Bosch Performance Line CX Smart System with Rim Magnet (Rim Magnet) E-Bike Tuning Chip

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9.6

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Unique use of original rim magnets. No additional speed sensor required. Very high-quality tuning module made in Germany. You can freely configure the speed limit between 25 km/h and 45 km/h. The installation is simple and is done via plug and play by plugging into the motor. No smartphone or PC is required, the module works immediately after installation on the motor thanks to the automatic initialisation.
Note: when tuning is activated, from approx. 21 km/h is too low and a distance is too low. This is necessary to permanently avoid tuning detection.
Latest V2 version with improved compatibility. Compatible with e-bikes equipped with a Bosch Performance Line CX Motor Gen4 (BDU37xx) or Gen5 (BDU38xx) and a rim magnet. Important: this tuning only works on e-bikes with rim magnet. Models without rim magnet are not supported. E-bikes with ABS system are also not supported. The matching module for Bosch engines in front of the Smart System can be found under the following link: https://www.amazon.de/dp/B09MJFJ2L6?ref=myi_title_dp
Compatible with software version 19.54.0 and all software versions before it. Please do not perform any further software updates of the e-bike afterwards, as this may lead to incompatibilities. Once installed updates can no longer be undone, even by the dealer.
Additional functions: activatable dynamic mode, leads to significantly smoother control at the speed limit. Switching the tuning on and off, as well as the infinitely freely selectable speed limit between 25 km/h and 45 km/h, is carried out via the support levels on the display/control panel. With this latest V2 version, you can also set a personal activation code if desired.

239,00 €
03

Wiesel Tuning

Wiesel E-Bike Tuning for Bosch Active Line — Performance Line — CX Gen4 (Variant V2)

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9.4

Excellent

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Main highlights

Very small design / not visible from the outside
Real speed modified readable
Displays the kilometres travelled.
Can be activated and deactivated or activated only for the current ride
All Bosch engines and displays (except Smart System with Kiox 300)

139,00 €
04

SPEEDBOX

SpeedBox 3.0 for Bosch

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9.3

Excellent

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You can activate the SpeedBox 3.0 on an e-bike display
We recommend using additional safety features and protective products to avoid injury. For short breaks, it is advisable to keep one foot on the pedal so as not to start the "countdown" trigger process so you can continue seamlessly. Please note that the warranty for the SpeedBox products does not apply to malfunctions caused by updating the engine. For longer stops, allow at least a partial "countdown" (kilometre deduction). Do not remove the screen from the electric bike until the "countdown" (kilometre subduction) is complete. We recommend not to update the software of the e-bike.
SpeedBox deactivates the speed limit of the pedelec and you can drive unlimited speed.
E-Bike tuning chip compatible with Bosch e-bike engines also 2024 Gen. 4: Bosch Active (Line, Plus), Performance (Line, CX, Speed), Cargo Line. Also compatible with pre-2024 model years.
Compatible with displays KIOX, INTUVIA, NYON, PURION, COBI. Not compatible with the Bosch Smart System! Not compatible with SpeedBox app

189,00 €
Value for Money

05

SPEEDBOX

SpeedBox 3.0 Bosch + Crank Puller E-Bike Tuning Set Suitable for All Bosch Engines

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9.2

Excellent

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WARRANTY & SOFTWARE UPDATE NOTE: DO NOT perform software updates on the e-bike. The warranty does not cover malfunctions caused by engine updates. Before removing the display from the e-bike, perform at least one partial "countdown" ride (distance removal process). Do not disconnect the display before the countdown process is fully complete.
Tuning specifications: speed limit lifted. Display shows real values. Individual speed limit adjustable. Bluetooth: No Software Updates: No
Not compatible with Bosch Smart System (BES3) with round connectors
INSTALLATION: EASY INSTALLATION - The cables are color coded and the connectors have different shapes for easy identification. Watch the installation video in the product image gallery or on our YouTube channel SpeedBox Tuning.
IMPORTANT - CHECK COMPATIBILITY BEFORE PURCHASE: Only compatible with Bosch Gen2, Gen3 and Gen4 engines (Active Line, Performance Line, CX, Speed, Cargo Line) - square connectors.

192,00 €
06

VOLspeed

VOLspeed V4 for Bosch + Crank Puller - Bosch E-Bike Tuning Kit Latest Generation (2014-2025) Includes Gen.4

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9.1

Excellent

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Main highlights

You can freely adjust the speed limit between 25 km/h and 45 km/h. Due to the limit of 45 km/h, you no longer have problems with the error code 504 (tuning detection) compared to other manufacturers
Volspeed - Quality made in Germany: the tuning hardware is completely waterproof, as the complete electronics are moulded. The rigid, sturdy housing rounds off the high quality and offers enormous durability. The VOLspeed module is completely made in Germany. You can even set a custom activation code. Even with active tuning, all data on the display remains correct.
The VOLspeed tuning chips are one of the most reliable e-bike tuning devices ever. Their engine optimisation is unique, the dynamic mode reduces the "wall effect". The alternative mode also offers the possibility to set individual support levels.
The VOLspeed tuning chip comes with original plugs and colour-coded cables for easy installation. The chip is installed invisible from the outside via plug and play by plugging it into the motor. No smartphone or PC is required, the module works immediately after installation on the engine. The included manual provides detailed installation and instruction manual with pictures that are easy to understand.
Please check compatibility before purchasing. This module is not compatible with the Bosch Smart System, installed in any high-quality e-bike with Bosch motor from 2023, see picture 2 selection aid. You are buying the left version in the picture. Compatible with Bosch engines from model year 2014 to 2025 of generations 1-4 with the displays Purion, Intuvia, Kiox, Nyon and Nyon 2. Not compatible with Bosch Smart System as well as the displays Kiox 300 / Kiox 500 / Intuvia 100 / Purion 200 / Purion 400 and the control units: system controller, mini remote, LED remote. The matching module for the Bosch Smart System can be found under the following link: https://www.amazon.de/dp/B0C96R6PMH?ref=myi_title_dp

174,00 €
07

VOLspeed

VOLspeed V4 for Bosch + Crank Puller Active/Performance/CX - Bosch E-Bike Tuning Chip

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8.9

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Volspeed - Quality made in Germany: the tuning hardware is completely waterproof, as the complete electronics are moulded. The rigid, sturdy housing rounds off the high quality and offers enormous durability. The VOLspeed module is completely made in Germany. You can even set a custom activation code. Even with active tuning, all data on the display remains correct.
The VOLspeed tuning chips are one of the most reliable e-bike tuning devices ever. Their engine optimisation is unique, the dynamic mode reduces the "wall effect". The alternative mode also offers the possibility to set individual support levels. You can freely adjust the speed limit between 25 km/h and 45 km/h. Due to the limit of 45 km/h, you no longer have problems with the error code 504 (tuning detection) compared to other manufacturers
The VOLspeed tuning chip comes with original plugs and colour-coded cables for easy installation. The chip is installed invisible from the outside via plug and play by plugging it into the motor. No smartphone or PC is required, the module works immediately after installation on the engine. Legal note: e-bike tuning chips are not permitted in the scope of the German Road Traffic Regulations. The tuning speed chip must not be operated in road traffic or in the effective range of the German Road Traffic Regulations. Use is at your own risk and responsibility. We accept no liability for any damage.
Please check compatibility before purchasing. This module is not compatible with the Bosch Smart System, installed in any high-quality e-bike with Bosch motor from 2023, see picture 2 for detection of the Bosch Smart System. VOLspeed tuning module for e-bikes / pedelecs with Bosch drive system from model year 2014. Suitable for all Active Line, Active Line Plus, Performance Line and Performance Line CX drives from model year 2014 with the displays Purion, Intuvia, Kiox, Nyon and Nyon 2.
Not compatible with the Bosch Smart System. You can see this best from the displays installed by the Bosch Smart System: Kiox 300 / Kiox 500 / Purion 200 / Purion 400 / Intuvia 100 as well as the operating units: System Controller, Mini-Remote, LED Remote. See second picture (selection aid), which displays/controllers the Bosch Smart System uses and are therefore not compatible. The matching module for the Bosch Smart System can be found under the following link: https://www.amazon.de/dp/B0C96R6PMH?ref=myi_title_dp

174,00 €
08

sIMPLEk

sIMPLEk Pro - Ebike Tuning Module for Bosch Classic | Active Line | Performance Line | CX (Standard Edition)

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8.6

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

️ The actual speed remains readable, maximum speed, distance kilometres and total kilometres are displayed correctly
️ Speed limit can be adjusted
️ In the standard configuration, the e-bike always starts with deactivated tuning without any intervention
️ Easy installation. Custom fit connectors Lediglich ein Stecker muss gezogen und der sIMPLEk zwischgeschaltet werden
️ Compatible with all Bosch engines (except 2022 Smart System models) and all display types
Operation within the scope or area of effect of the StVO is prohibited and not permitted. Operation is intended exclusively on private properties and race tracks closed off for public transport. No liability is assumed for any current or future damage (indirectly and directly) caused by the commissioning of the sIMPLEk Pro. Use at your own risk.
Not compatible with the Smart System models

109,00 €
09

VOLspeed

VOLspeed V4 for Bosch Active/Performance/CX - Bosch E-Bike Tuning Chip

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8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Show more
Main highlights

Volspeed - Quality made in Germany: the tuning hardware is completely waterproof, as the complete electronics are moulded. The rigid, sturdy housing rounds off the high quality and offers enormous durability. The VOLspeed module is completely made in Germany. You can even set a custom activation code. Even with active tuning, all data on the display remains correct.
The VOLspeed tuning chips are one of the most reliable e-bike tuning devices ever. Their engine optimisation is unique, the dynamic mode reduces the "wall effect". The alternative mode also offers the possibility to set individual support levels. You can freely adjust the speed limit between 25 km/h and 45 km/h. Due to the limit of 45 km/h, you no longer have problems with the error code 504 (tuning detection) compared to other manufacturers
The VOLspeed tuning chip comes with original plugs and colour-coded cables for easy installation. The chip is installed invisible from the outside via plug and play by plugging it into the motor. No smartphone or PC is required, the module works immediately after installation on the engine. Legal note: e-bike tuning chips are not permitted in the scope of the German Road Traffic Regulations. The tuning speed chip must not be operated in road traffic or in the effective range of the German Road Traffic Regulations. Use is at your own risk and responsibility. We accept no liability for any damage.
Please check compatibility before purchasing. This module is not compatible with the Bosch Smart System, installed in any high-quality e-bike with Bosch motor from 2023, see picture 2 for detection of the Bosch Smart System. VOLspeed tuning module for e-bikes / pedelecs with Bosch drive system from model year 2014. Suitable for all Active Line, Active Line Plus, Performance Line and Performance Line CX drives from model year 2014 with the displays Purion, Intuvia, Kiox, Nyon and Nyon 2.
Not compatible with the Bosch Smart System. You can see this best from the displays installed by the Bosch Smart System: Kiox 300 / Kiox 500 / Purion 200 / Purion 400 / Intuvia 100 as well as the operating units: System Controller, Mini-Remote, LED Remote. See second picture (selection aid), which displays/controllers the Bosch Smart System uses and are therefore not compatible. The matching module for the Bosch Smart System can be found under the following link: https://www.amazon.de/dp/B0C96R6PMH?ref=myi_title_dp

174,00 €
10

VOLspeed

VOLspeed V2 for Bosch Performance Line CX Smart System with Rim Magnet (Rim Magnet) E-Bike Tuning Chip

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8.3

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Show more
Main highlights

Unique use of original rim magnets. No additional speed sensor required. Very high-quality tuning module made in Germany. You can freely configure the speed limit between 25 km/h and 45 km/h. The installation is simple and is done via plug and play by plugging into the motor. No smartphone or PC is required, the module works immediately after installation on the motor thanks to the automatic initialisation.
Note: when tuning is activated, from approx. 21 km/h is too low and a distance is too low. This is necessary to permanently avoid tuning detection.
Compatible with software version 19.54.0 and all software versions before it. Please do not perform any further software updates of the e-bike afterwards, as this may lead to incompatibilities. Once installed updates can no longer be undone, even by the dealer.
Compatible with e-bikes equipped with a Bosch Performance Line CX motor (BDU37 & BDU38) and a rim magnet. Important: this tuning only works on e-bikes with rim magnet. Models without rim magnet are not supported. E-bikes with ABS system are also not supported. The matching module for Bosch engines in front of the Smart System can be found under the following link: https://www.amazon.de/dp/B09MJFJ2L6?ref=myi_title_dp
Additional functions: activatable dynamic mode, leads to significantly smoother control at the speed limit. Switching the tuning on and off, as well as the infinitely freely selectable speed limit between 25 km/h and 45 km/h, is carried out via the support levels on the display/control panel.

239,00 €