Badass Box 5 for Bosch Gen5 e-bike motors with rim magnet
E-bike tuning to remove the 25 km/h limit of pedelecs with Bosch Gen5 Smart System Drivetrains with rim magnets from 2025. Ride faster than ever before and utilize the true potential of your e-bike motor!
Attention: Due to high demand, the next delivery will not be until week 18. You can pre-order now and will receive your order immediately.
This is a practical tuning solution especially for Bosch Smart System drives with Performance CX engines and the technical identification “BDU38” (“Bosch Drive Unit with serial number 38”). These models, introduced successively from the beginning of 2025, are sometimes referred to as "Bosch CX Gen5" or simply "Bosch Gen5." This tuning is aimed exclusively at models with a rim magnet.
Tip: If you have a Bosch Smart System E-Bike have with Performance CX engine of the years 2022-2024 (often referred to as “Bosch Gen4”) and the technical marking “BDU37” (and with rim magnet), please select the "Badass Box 5 for Bosch rim magnet BDU37".
For the Badass Box 5 the housing of the box was completely redesigned and optimized, for example an extra seal was added.
In contrast to its predecessors, the Badass Box 5 no longer needs to be pushed onto a specific sensor type, but is adapted to the respective drives with an adapter. As a result, the Badass Box 5 continue to use with a new adapter when changing e-bikes.
It is also practical that the Badass Box 5 with the Boost Buddy App compatible (iOS & Android). The app allows for easy tuning configuration; new firmware can also be installed on the box if required. Furthermore, the Boost Buddy App also as a speedometer to show the correct speed on the smartphone display (when tuning is active, the original e-bike display shows no
correct values no longer appear).
The Badass Box Tuning tools are developed and manufactured in Germany.
Note: The new edition of the Badass Box 5 has been successfully published. We are currently approximately three weeks behind on delivery at the time of order. So if you order now, we will ship in two to three weeks. Therefore, we are keeping the product on "pre-order."
Badass Box 5 – Features at a glance
- Unlocking: The 25 km/h speed limit is removed. This allows driving without a limit.
- Contactless tuning : Since there is no electrical connection to the motor, the drive cannot be damaged by the tuning.
- Compatible with the Boost Buddy app: The optional app allows you to configure the tuning and, if necessary, load new firmware onto the box (free of charge).
-When using the Badass Box 5 shows the e-bike display no
correct values.
Tip: You can display your correct speed using the Boost Buddy app on your smartphone. It's best to use a special mount to attach your phone directly to the handlebars. This way, you always have it in good view.
-The energy supply of the Badass Box Power is still provided by the proven AAA battery. This has a long range of 7.000 km or 1 year (due to battery discharge). Suitable replacement batteries are available everywhere.
-Optimized housing: The housing of the Badass Box is now even slimmer and has also been equipped with an extra seal.
-The box is robust and weatherproof: The tuning electronics have been glued into the housing and completely sealed so that they are optimally protected from mechanical stress on the bike and from moisture.
-Easy installation; no special technical knowledge is required.
-Flexible adjustment possible via adapter.
-Made in Germany.
Badass Box 5 Installation & Functionality
Below, we explain how to install the tuning and how to unlock the drive. Installation has been kept as simple as possible.
First of all: Bosch Smart System E-bikes with rim magnet there is a magnet on the valve of the rear wheel, which Impulse or the vehicle speed is transmitted to the sensor of the drive system, which is integrated in the engine. This is exactly where the Badass Box 5 an.
Installation of the tuning
-First the original magnet must be removed from the rear wheel.
-Instead of the original magnet, a small magnet with a screw cap is mounted in the spokes. This new magnet sends its Impulse no longer to the sensor in the engine, but directly to the Badass Box 5, which is attached anywhere on the chainstay (with cable ties).
-The Badass Box is connected via a plug to a pulse generator, which in turn sends signals to the original sensor in the engine (the pulse generator coil finds the correct location for mounting on the engine almost automatically, and only needs to click firmly into the correct position). These signals are similar in form and duration to the original rear wheel signals, but depending on the type of Badass Box The number of signals is reduced, or the signal is frozen at a certain speed. This constantly tricks the drive into thinking the speed is lower than the actual speed. As a result, the motor provides assistance even at speeds above 25 km/h, and there is essentially no speed limit.
-This means that the new Badass Box 5, just like the previous models, does not interfere directly with the electronic drive system during tuning.
Please note: Since this operating principle does not involve a direct cable connection between the tuning box and the drive system, all speed-related data displayed will be inaccurate – this applies to current speed, average and maximum speed, as well as distance traveled, etc. However, you can easily view the correct data using the Boost Buddy app .
Compatibility
The adapter of this Badass Box 5 only fits:
Bosch Smart System Performance CX motors from 2025 with the technical designation “BDU38” (Bosch Gen5) with rim magnet. Compatible with the latest software and firmware versions.
Compatible with Bosch Smart System upgrade from July 2025 (version 16.19.0, the so-called "100Nm Upgrade"). Also compatible with all older software versions.
Note: On e-bikes with a rim magnet, the sensor is integrated into the motor, making it invisible from the outside. You can identify models with a rim magnet by the relatively large magnet on the rear wheel valve – here's a photo:
Before placing an order, please make sure you know your e-bike's internal technical identification ("BDU38" or "BDU37"). Please check your bike's technical specifications or ask your dealer.
Has yours Bosch Smart System E-Bike with rim magnet the technical name “BDU37” (Bosch Smart System Performance CX engines 2022-2024) please select the "Badass Box 5 for Bosch rim magnet BDU37".
IMPORTANT: Do not perform e-bike updates
The manufacturer of this product ("Badass eBikes GmbH") strongly advises against performing firmware updates or upgrades on your e-bike. It's entirely possible that the tuning may no longer work after an update!
Installing an e-bike tuning chip in your e-bike may require special tools . Please check beforehand whether you need to open the motor compartment to access the motor's connectors. This applies particularly to products in the categories of modules , kits , dongles , and sensors.
If you don't opt for a tuning solution that requires installation in the engine compartment ( such as a tuning box or software ), you won't need the necessary tools. You'll find further tips in our guide .
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Important information on tuning measures for e-bikes and e-scooters
We expressly point out that any modification to e-bikes and e-scooters – whether through hardware tuning (e.g. tuning chips, dongles, sensor adapters) or software tuning (e.g. apps, programs or USB tools) – can have consequences.
Tuning measures on e-bikes and e-scooters mean that they are no longer permitted for use on public roads as defined by the StVZO (Road Traffic Licensing Regulations). Legal use is therefore only possible on private property or - if permitted - in competitions. Riding an e-bike or e-scooter modified by tuning measures on public roads can lead to criminal liability for driving without a license (Section 21 of the Road Traffic Act) and driving without insurance (Section 6 of the PflVG). Tuning measures on e-bikes can lead to the loss of warranty rights and manufacturer guarantees. Furthermore, tuning measures can lead to the loss of insurance coverage and benefits from accident victim assistance in the event of an accident. The e-bike (or e-scooter) modified by tuning measures is subject to additional stress due to the higher speed, which can lead to safety risks.
Payment & Shipping
Delivery time, shipping costs, minimum order value and payment methods:
Delivery time:
The processing time for physical products generally only begins after payment has been received . Within Germany, it usually takes 1–3 business days . In exceptional cases, processing may take up to 8 business days . Delivery times to other countries may vary.
Please note: You will only receive a DHL shipment confirmation once the shipment has been scanned for the first time at the parcel center. Only from this point onward will the shipment be trackable.
Due to high demand, ongoing incoming goods, or anticipated short-notice restocks, some products may experience longer processing times. We appreciate your understanding.
Note regarding digital products/license codes: License codes and license keys are not sent by mail, but by email . Processing begins only after payment has been received. Please note that instant bank transfers do not automatically result in a direct bank credit, and in some cases, credit card payments may also experience delays in payment reconciliation. The respective license code will then be generated and sent. This may take several hours in some cases. If you do not receive a license code, please always provide us with the order number in the format xxx-xxx-xxx.
For customers from Switzerland: For deliveries to Switzerland, we recommend a separate service.
Shipping:
Shipping costs for Germany are €4,90; shipping is waived for orders over €180. For countries within the EU, shipping costs are €12,90; shipping is waived for orders over €2.000. We currently do not ship to countries outside the EU. We also do not ship to the USA, France, or Canada (including any overseas territories). We ask that you bear the costs of any return shipments yourself. Please note that customs duties may apply in countries outside the European Union.
Minimum order value:
The minimum order value is €25. Only above this amount are advance payment, PayPal, and bank transfer available as payment methods.
Maximum order value:
The maximum order value for orders outside the EU is €1.000. The maximum order value within the EU is €12.500.
Payment in advance via bank transfer:
Please transfer the total amount, including your order number, to our account, which was communicated to you in the confirmation email. Please note that transfers within Germany can take up to three business days. Transfers from abroad, especially from Austria, usually reach us very quickly. Transfers from other countries can take slightly longer on average.
Payment in advance via Paypal:
At the end of the ordering process, you will be redirected to the PayPal page. There you can initiate your payment. Once the PayPal transaction is complete, your order status will change in the shop. The goods will then be shipped as soon as possible.
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Shipping: For hardware products, you will receive an email with the tracking number on the evening of shipment. For software products, you will receive your license code after payment has been received and a short processing time has elapsed.
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