Best Bosch Cx Motor 2026

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Last Updated - 22.07.2026

Best Choice

01

SPEEDBOX

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

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9.9

Exceptional

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The maximum speed can be set in the SpeedBox app or by changing the modes: TURBO - eMTB - TOUR+ - ECO - TOUR+ - eMTB - TURBO. After that, the current speed limit will be displayed. Activation of the WALK function or 360° rotation of the rear wheel increases the speed by 5 km/h. The last displayed limit is stored after 15 seconds of inactivity.
Maximum speed: unlimited (max. 35 km/h recommended). Actual speed: in the SpeedBox app. Correct driving distance: after countdown process activation/deactivation (do not perform while driving): SpeedBox App WALK function or buttons - + - + display: YES (3.5/2.5 km/h)
Compatible with: e-bikes with valve magnet (Bosch rim magnet) latest Bosch software version SpeedBox app. Not compatible with: standard magnet ABS system motors of the 5th generation
Compatible with the latest software from Bosch. The most advanced Bluetooth tuning chip for e-bikes with Bosch Performance Line CX motor of the 4th generation, smart system and rim magnet. Eliminates the speed limit. Easier Installation - No need to search for the position of the magnet simulator. Compatible with the SpeedBox app.
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

349,00 €
Value for Money

02

VOLspeed

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

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9.7

Exceptional

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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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9.5

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 €
04

Bosch

Bosch E-Bike Generation 4 Performance CX Drive Unit Logo Cover

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9.4

Excellent

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Product line compatibility Perform. Line Speed (BDU4XX), Perf/Cargo/CX/Speed (BDU4XX)
If the design cover is not attached
Colour: black

9,90 €
05

Optio Cycle

Optio Cycle Bottom Bracket Tool for Bosch Lockring Gen 3/4/5 - High Quality Bottom Bracket Wrench for E-Bike Bottom Bracket | Tool & Crank Puller Bicycle | Bosch Spider Tool

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9.3

Excellent

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Versatile: can be used as a lock ring tool Bosch for bottom bracket tool and crank puller Bosch Performance CX compatible with various Bosch e-bike drives.
Precise tool bicycle for mounting and disassembly of the chainring tool on Bosch Gen 3/4/5 and Brose drives for effortless maintenance and quick repairs.
Perfect for replacing worn sprockets Bosch Performance CX or for servicing the engine cover allows easy repairs without additional bottom bracket keys.
Made of high-quality steel for maximum durability pedal bearing bicycle tool for use in professional workshops and for hobby mechanics at home.
Essential bicycle tool bottom bracket for easy handling with ergonomic design crank puller ebike Bosch for safe and efficient work without damaging the components.

21,95 €
06

Fantic26

F26 Lock Ring Tool Ebike Bicycle Locking Ring Chain Ring Spider Service

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9.2

Excellent

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Main highlights

Tools as well as Nerrow chainrings, e-bike crank arms and other wear parts can also be found here in the Fantic26 Amazon shop
5. Package Contents & Notes Box contents: 1 x lock ring mounting nut. For crank arms without integrated puller, a crank arm puller is also required (EAN 4251111554432). Some chainring bolts require a locking tool (EAN 4251111556313). Matching e-bike spare parts can be found in our shop.
4. Robust and durable. Made from high-quality, CNC machined steel for maximum stability and long service life. The lock ring tool is resilient, low-wear and ideal for regular use in the workshop or hobby garage - even with fixed chainring locking rings.
3. Precise fit outer diameter 41.5 mm, inner tooth circle 37 mm, central bore 31.9 mm with −4.5 mm cut-out and 23 mm socket with 8 teeth (4 x 5 mm). Precisely matched to standard lock rings, chainring spider and e-bike drives for a secure fit without play. Nut was made on CNC machine 5 axis
2. High compatibility: suitable for Brose engines Mag S & Drive S as well as Bosch Active Line (BDU310), Active Line Plus (BDU350), Performance Line Cruise (BDU365), Cargo Line (BDU450 CX, BDU490P), Performance Line Speed (BDU490P) and Performance Line CX Gen.3 & Gen.4. Gen.5 Also compatible with Yamaha PW-X engines.
1. Use and function lock ring tool for mounting and disassembling the chainring locking ring on e-bikes. Ideal for chainring, spider and engine mount. Allows safe loosening and tightening without damaging the thread, motor or frame - perfect for maintenance, repair and chainring changes on modern e-bike drives.

24,95 €
07

VOLspeed

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

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9.1

Excellent

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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

SPEEDBOX

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

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9.0

Excellent

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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.

192,00 €
09

Wiesel Tuning

Wiesel Tuning For Bosch Smart System without Rim Magnet (Rim Magnet)

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8.8

Very Good

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Main highlights

Speed still readable & flexible activation - The display remains in the display but is displayed modified. The module can be permanently activated, permanently deactivated or only activated once for the current ride.
Not compatible with rim magnet (Rim Magnet) or Bosch ABS - Only suitable for e-bikes with external speed sensor and visible magnet on spoke or brake disc. If no magnet is visible, a module for rim magnet is usually required. ABS models are also not compatible.
How to recognise the Bosch Smart System – Typical Bosch Smart System components are: LED Remote, SmartphoneGrip (BSP3200 with the Flow App), Kiox 300/400C/500, Intuvia 100, Purion 200/400 and System Controller + Mini Remote.
Compatible with Bosch Smart System (BES3) - Suitable for e-bikes with Bosch Smart System and external speed sensor. Supports all Bosch Smart System displays and remotes.
Compact, discreet design - The module is designed for clean integration into the e-bike. If necessary, easy disassembly is possible.

209,00 €
10

Wheeloo

Wheeloo Ebike Motor Protective Cover, Bicycle Carrier Transport Protection, Motor Protection Cover as Rain Cover, Suitable for Bosch, Brose, Shimano, Yamaha, Specialized e Bike, Bicycle Trailer Accessories

18% Off

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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.

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Main highlights

Universal fit: suitable for all e-bike engines such as Bosch CX, Shimano EP8/E8000/E5000, Yamaha PWX2, Specialized and others. Not suitable for fully.
Reliable hold: large strips and sturdy seams promise a tight fit even at high speeds. The water-repellent 420D nylon fabric is resistant to salt and moisture
From the e-bike specialists // Wheeloo has been a well-known brand for bicycle accessories for many years: more than 350,000 customers have already chosen Wheeloo
For dust-free storage: the close-fitting protective cover prevents dust and dirt when storing the e-bike in the garage
Easy to install: in just 4 simple steps, you close the sturdy fasteners. This is quick and convenient thanks to German instructions including assembly video
Avoid transport damage: the water-repellent nylon protects against splashes of water, dirt and stone chips when transporting the e-bike. Mid-motor electronics and mechanics are reliably protected against salt and sand

32,90 € 39,90 €(18% Off off)