Best Bosch Cx Tuning 2026

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Last Updated - 03.02.2026

Best Choice

01

SPEEDBOX

SpeedBox 1.3 Compatible with Bosch Smart System (Performance Line CX 4th Gen) for E-Bikes with Rim Magnet on Rear Wheel Tuning Chip

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9.9

Exceptional

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Main highlights

The maximum speed can be adjusted by changing the modes: TURBO - eMTB - TOUR+ - ECO - TOUR+ - eMTB - TURBO. After that, the actual speed limit is displayed. The electrical support can also be increased by briefly activating the WALK function or by turning the rear wheel 360° by 5 km/h. The last displayed limit is stored after 15 seconds of inactivity.
Maximum speed: unlimited (max. 35 km/h recommended). Display: real speed: no. Correct driving distance: after countdown process activation/deactivation (do not perform while driving): WALK function or buttons - + - + indicator: yes (3.5/2.5 km/h)
Compatible with: e-bikes with valve magnet (Bosch rim magnet). Newest Bosch software version. Not compatible with: standard magnet ABS system engines of the 5th Generation Performance Line SX SpeedBox App
Compatible with software version up to 15.24.1. The most advanced tuning chip for e-bikes with Bosch Performance Line CX motor, 4. generation, smart system and rim magnet. Eliminates the speed limit. Easier Installation - No need to search for the position of the magnet simulator.
After finishing the ride, leave the bike on until 0.0 km/h is displayed. During this process, the remaining time is displayed. After that, the bike can be safely switched off. Do not remove the display before the countdown is complete. Installation video: https://www.youtube.com/watch?v=y8l87ksRUjM&t=15s

289,00 €
02

VOLspeed

VOLspeed 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.
Compatible with software version 16.19.0 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 €
03

VOLspeed

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

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9.7

Exceptional

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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 €
04

Wiesel Tuning

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

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9.5

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 €
Value for Money

05

SPEEDBOX

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

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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

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.

151,00 €
06

VOLspeed

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

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9.3

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 €
07

SPEEDBOX

SPEEDBOX 3.0 for Bosch // eBike Tuning Chip Also for Bosch Engines 2nd, 3rd, 4th Generation Including Crank Puller

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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

You can activate the SpeedBox 3.0 on an e-bike display.
To connect the SpeedBox to an e-bike, we use colour plugs that are equipped with a key for correct connection, so installing the product is really easy. We have written detailed instructions and created videos that allow every customer to install the SpeedBox. Removing the SpeedBox is as easy as installation. If you have some connection problems, please do not hesitate to contact us.
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 2023 Gen. 4: Bosch Active (Line, Plus), Performance (Line, CX, Speed), Cargo Line. Also compatible with pre-2023 model years.
Compatible with Displa. Not compatible with the Bosch Smart System! Not compatible with SpeedBox Appys KIOX, INTUVIA, NYON, PURION, COBI.

151,00 €
08

Gold-Fieber

Gold-Fieber SpeedFun Furious Evo E-Bike Tuning Chip for Bosch Generation 1-4 Active/Performance/CX

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9.1

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 high-quality tuning module. The speed limit is completely removed by the e-bike from approx. 20 km/h, always a speed of less than 25 km/h, which means an unlimited speed limit. The installation is very simple and is invisible from the outside, via plug and play by plugging on the motor. No smartphone or PC is required, the module works immediately after installation on the motor thanks to the automatic initialisation. Simply plug in and get started!
The module is very small and lightweight. The dimensions are approx. 3 cm x 1.5 cm x 0.7 cm + cable. The total weight is only approx. 10 grams. Installation and user manual at the following link: https://tinyurl.com/383uc8uk
Please do not perform software updates of the e-bike as this may lead to incompatibilities. 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 selection aid. Compatible with all Bosch engines from model year 2014 with the displays: Purion, Intuvia, Kiox, Nyon and Nyon 2. (See left side picture 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. ( See right side picture 2) The matching module for the Bosch Smart System without rim magnet, can be found under the following link: https://www.amazon.de/dp/B0FSG2FS5V
Note: from approx. 20 km/h, too low a speed is displayed and a distance that is too small is measured. The mileage is therefore too low after using the tuning.

135,00 €
09

sIMPLEk

sIMPLEk Pro - Ebike Tuning for Bosch Classic | Active Line | Performance Line | CX (Gen4) (Kit - Kit)

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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

️Compatible with Bosch Classic Line drives from 2011, all Active Line and Performance Line (CX) including Gen4 (except Smart System models) with all control units
️ 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. Perfectly fitting waterproof connectors. Lediglich ein Stecker muss gezogen und der sIMPLEk zwischgeschaltet werden
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.

69,99 €
10

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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8.7

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 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!

151,00 €