Best Bosch Cx Tuning 2026

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Last Updated - 27.03.2026

Best Choice

01

VOLspeed

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

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9.8

Exceptional

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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 17.16.0 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 €
02

VOLspeed

VOLspeed V2 for Bosch Smart System E-Bike Tuning Chip

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9.7

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

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. Installation and operating video under the following link: https://www.youtube.com/watch?v=MXWPQhByYSc&t=388s&ab_channel=VOLspeedEbikeTuning
Please check for compatibility before purchasing. Compatible with e-bikes that use the Bosch Smart System, you can see this by means of the displays installed by the Bosch Smart System: Kiox 300 / Kiox 500 / Intuvia 100 / Purion 200 / Purion 400 as well as the control units: System Controller, Mini-Remote, LED Remote. See picture 2 (selection guide) not compatible with other Bosch engines or Bosch smart systems with rim magnet or ABS system. The right module for Bosch engines in front of the smart system under the following link: https://www.amazon.de/dp/B09MJFJ2L6?ref=myi_title_dp
Note: When tuning is activated, a speed is displayed from 21 km/h and a distance that is too small is measured. The mileage is therefore too low after using the tuning.
Compatible with software version 17.16.0 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. Individual activation code adjustable. The tuning is switched on and off, as well as the freely selectable speed limit between 25 km/h and 45 km/h, is done via the buttons on the control panel.

199,00 €
03

Wiesel Tuning

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

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9.5

Excellent

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

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 eBike Tuning Chip Compatible with Bosch Engines 2017-2025

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9.4

Excellent

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

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

VOLspeed

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

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9.3

Excellent

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

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 €
06

VOLspeed

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

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9.2

Excellent

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 €
07

RedPed

RedPed For Bosch Smart System BES3 E-Bike Tuning Chip with App (Not Rims/Valve Magnet) eBike

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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

Tuning activation with app, speed or magnet
Real speed can be displayed in the e-bike display as a decimal number
Max speed adjustable from 15 to 33 km/h. Can be unlocked up to 45 km/h in the app.
Free RedPed 2 app for Android and RedPed app for iOS
Firmware can be updated via app

149,99 €
08

SPEEDBOX

Speedbox 3.0 for Bosch, eBike Tuning also for Bosch engines of the 4th generation, tuning chip of the 3rd generation

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8.8

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

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.
To connect the SpeedBox chip to an e-bike, we use colour plugs that are equipped with a key for correct connection, so installing the chip is really easy. We have written detailed instructions and created videos that allow every customer to install the SpeedBox. Removing the tuning chip is as easy as installation. If you have some connection problems, please do not hesitate to contact us.
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 display from the electric bike until the "countdown" (kilometre subduction) is complete. We recommend not to update the software of the e-bike.
If you want to install a SpeedBox into a brand new bike, you need to ride at least 10 km on this bike before starting the chip for the first time. https://youtu.be/wbRFMx4gZgs?si=sK6LJhoY40URLVKg
E-bikes equipped with SpeedBox must not be used on public roads, bike paths or public places.
E-Bike tuning chip compatible with Bosch e-bike engines 2017-2024: Bosch Active (Line, Plus), Performance (Line, CX, Speed), Cargo Line
Compatible with displays KIOX, INTUVIA, NYON, PURION, COBI. Not compatible with SpeedBox app. Not compatible with the Bosch Smart System!

189,00 €
09

SPEEDBOX

SpeedBox 3.0 Compatible with Bosch Engines 2017-2025 + Crank Puller, E-Bike Premium Tuning Chip

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8.7

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.

Show more
Main highlights

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.
To connect the SpeedBox chip to an e-bike, we use colour plugs equipped with a key for correct connection, so that installing the chip is really easy. We have written detailed instructions and created videos that allow every customer to install the SpeedBox. Removing the tuning chip is as easy as installation. If you have some connection problems, please do not hesitate to contact us.
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.
If you want to install a SpeedBox into a brand new bike, you need to ride at least 10 km on this bike before starting the chip for the first time. https://youtu.be/wbRFMx4gZgs?si=sK6LJhoY40URLVKg
E-Bike tuning chip compatible with Bosch e-bike engines 2017-2024: Bosch Active (Line, Plus), Performance (Line, CX, Speed), Cargo Line.
Compatible with displays KIOX, INTUVIA, NYON, PURION, COBI. Not compatible with SpeedBox app. Not compatible with the Bosch Smart System!
A crank puller is included.

192,00 €
10

sIMPLEk

sIMPLEk Pro - Ebike Tuning for Bosch Performance Line | CX (BES3) Smart System (Nano Edition)

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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.

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Main highlights

️ The actual speed remains readable, maximum speed, distance kilometres and total kilometres are displayed correctly
️ Motor support 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 the Bosch Performance Line (CX) Smart System BES3 drives with all controls. Tuning detection: For current firmware versions, please select the Nano Edition
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.
Not compatible with the internal speed sensor (recognisable by magnet on the rear valve) and the ABS system

149,00 €