NOTE: Conventional tuning modules offer only limited functionality compared to today’s e-bike standards. They often rely on complex and unintuitive display button sequences for activating, deactivating, or adjusting speed limits. This makes operation cumbersome, especially during a ride. In some cases, users must stop the bicycle and manually rotate the rear wheel multiple times to initiate or confirm the selected setting — a process that is inefficient and inconvenient for real-world riding conditions.
|
Feature |
❌ Conventional Tuning Chips |
✅ EPAspeed B.Tuning |
|
Setup & Activation |
Complicated button combinations, easy to forget |
Simple app control — activate or deactivate with a tap |
|
Speed Limit Adjustment |
Requires rotating the wheel or entering complex codes |
Instantly adjustable in the EPAspeed app |
|
Firmware Resistance |
Easily disabled after motor or display updates |
Fully resistant to OEM firmware updates |
|
Display Compatibility |
Often shows wrong speed or altered speed |
Preserves full speed and distance accuracy |
|
Installation |
Wired directly into display or motor — risk of detection |
Contactless design — no software interference |
|
Bluetooth Functionality |
Not available |
Built-in Bluetooth — control settings, monitor stats, set limits |
|
User Experience |
Outdated, difficult to use, and not intuitive |
Modern, seamless, and designed for real e-MTB riders |
|
Safety & Reliability |
Risk of error codes, firmware lockout, or damage during updates |
Engineered for long-term reliability with non-invasive integration |
In contrast, the EPAspeed B.Tuning series represents the next generation of e-bike tuning — fully app-controlled, firmware-resistant, and designed for effortless operation. With Bluetooth connectivity, intuitive controls, and invisible tuning functionality, EPAspeed delivers precision, reliability, and freedom unmatched by conventional solutions.
Key Features
• Tuning Control – Instantly activate or deactivate tuning
• Adjustable Speed Limits – Set your preferred maximum assistance speed
• Invisible Tuning Mode – Undetectable operation for smooth and safe performance
• Trip Recording – Automatically save and review detailed ride statistics
• Comprehensive Ride Data – Monitor distance, duration, average & max speed, and elevation
👉 Click here to view the EPAspeed 1.3 B.Tuning for Bosch
COMPATIBILITY & PRODUCT CODE VERIFICATION GUIDE
Important – Please Read Before Purchasing
Before purchasing this device, it is essential to verify the “Product Code” of your Bosch motor to ensure compatibility.
The Product Code is printed directly on the motor label.
In the example image, the two label formats currently used by Bosch are shown, with the Product Codes highlighted in red.
COMPATIBLE BOSCH MOTORS
BDU33 (Gen3): Performance Line, Active Line, Active Line Plus
BDU3142 / BDU3143 (Gen4): Performance Line SX, Motor mounting: 2 upper bolts
BDU3144 / BDU3145 (Gen4): Performance Line SX, Motor mounting: 2 diagonal bolts
BDU37 (Gen4): Performance Line CX, Performance Line CX-Race
BDU38 (Gen5): Performance Line SX, Performance Line CX, Performance Line CX-R
NOT COMPATIBLE WITH
❌ Classic Spoke Magnet Systems
This device is not compatible with e-bikes equipped with the traditional magnet mounted on the wheel spokes or brake disc.
❌ Bosch ABS Equipped Bikes
This device is not compatible with e-bikes using the Bosch ABS braking system.
❌ Bosch ConnectModule / GPS Systems
This device is not compatible with e-bikes equipped with the Bosch ConnectModule GPS system.
SPEEDBOX 1.3 B.Tuning FOR BOSCH (BDU37)
SIMPLIFIED INSTALLATION
No need to find a suitable position for the Magnet Simulator
DESIGNED FOR MOTORS OF 4TH GENERATION:
Performance Line CX
Performance Line CX Race
Performance Line Speed
PROPERTIES:
Maximum speed: Unlimited (max 35 km/h recommended)
Display shows:
Real speed: No (only in SpeedBox App)
Correct travelled distance: after countdown process
Activation/deactivation (do not perform while riding):
WALK function
buttons - + - +
Indication: YES (3.5/2.5 km/h)
Compatible with:
E-bikes with valve magnet (Bosch Rim Magnet)
Not compatible with:
Standard magnet
ABS system
5th generation motors (BDU384Y)
Performance Line SX
The tuning for e-bikes with the newest Bosch Gen. 4 motor and Smart System + Rim Magnet. Get the most of your e-bike!
SpeedBox 1.3 B.Tuning for Bosch enables you to suppress the speed limiter on your e-bike.
If you want to see correct speed and all riding data during your ride, we recommend choosing SpeedBox 1.3 B.Tuning for Bosch - you can see the real values in our SpeedBox App – right on the display of your phone.
How does SpeedBox 1.3 B.Tuning for Bosch work?
To activate all the functions of the SpeedBox correctly, it is necessary to enter the menu after the first switching on of the e-bike after the tuning installation and switch to the circumference of the wheel of your e-bike, if you have older firmware on your e-bike.
Activate/deactivate the tuning before the ride (when the e-bike is standing still), not during riding!
You will activate the SpeedBox 1.3 B.Tuning tuning directly on your e-bike’s control unit by activating the WALK assist function shortly (holding down the “-” button). Your e-bike display will show a value of 3.5 km/h (2.2 mph) and from now on you will be able to ride up to 35 km/h. You may change the default speed limit to any limit you want (up to 99 kph), however, to minimize the risk of error codes, we recommend not to exceed 35 km/h.
To deactivate the tuning, activate the WALK assist function shortly again (by holding down the “-” button). Your e-bike display will show a value of 2.5 km/h (1.6 mph) and the speed limit will be reset to 25 km/h. Your e-bike will then work the same as before the tuning installation.
SpeedBox was also designed for e-bikes that do not have the WALK assist function enabled, or activated. In this case, you can activate/deactivate tuning by switching between two assistance modes twice, i.e. by pressing the - + - + buttons.
You can set the maximum speed limit by switching the modes from TURBO mode three levels down and then three levels up: eMTB - TOUR+ - ECO - TOUR+ - eMTB - TURBO. An actual speed limit will be displayed after that. The maximum speed of an electric assistance can be switched by activating WALK assist function shortly or by turning the rear wheel 360°. The value of 2.5 km/h on the display corresponds with the limit of 25 km/h, 3.0 corresponds with 30 km/h, 3.5 corresponds with 35 km/h etc. The last displayed limit will be saved after 15 seconds of inactivity.
After finishing the ride, leave the bike on until a value of 0.0 km/h is displayed. During this process the remaining time will be displayed. Then it is safe to turn off your bike and you can start looking forward to your next trip. Do not remove the display to lock the e-bike until SpeedBox finishes the "countdown" process.
Assembly
We use original connectors for the production of SpeedBox products ensuring that the installation process is very simple and the SpeedBox is connected properly. We have also prepared detailed instructions and videos to make installation easy for you. Disassembly of the SpeedBox is just as easy. If you have any troubles with installation or disassembly, do not hesitate to contact us.
If you are planning to install SpeedBox on a brand-new bike, make sure you ride it for at least 10 km before the tuning is activated.
Important:
Connect the male - female connectors in the direction of the lock. Do not rotate the connectors during connection!
Instruction manual
https://www.speedbox-tuning.com/um-speedbox-1-3-for-bosch https://tuningelektrokol.s9.cdn-upgates.com/3/36810b4ca2ba01-sb13bt-b-manual.pdf https://tuningelektrokol.s9.cdn-upgates.com/g/g6810b5a252728-sb13bt-b-connection.pdf https://www.youtube.com/watch?v=y8l87ksRUjM
Warning
Please note that the operation of this type of modified electric bikes on public roads may be against the law in some countries. The manufacturer takes no responsibility for damages resulting from the use of SpeedBox products. Electric bikes equipped with SpeedBox products are not allowed to be used on public roads, cycling paths and public places. Electric bikes equipped with SpeedBox products can be used exclusively on private property and entirely at one’s own risk. The use of SpeedBox may void the warranty of your ebike.
We strongly recommend using other safety features and protective gear to prevent injuries.
We recommend not updating the firmware of your e-bike. Updating increases the risk of tuning detection.
Please disable automatic updates in the eBike Flow App.
Please note that warranty of SpeedBox products does not apply on malfunctions caused by updating the motor.
When stopping for a short time, in order to continue riding smoothly, we recommend keeping one foot on the pedal so that the countdown does not start.
When stopping for a longer period of time, allow at least a partial countdown to take place.
After a long ride, the countdown may take several minutes.
Do not remove the display if the countdown has not been finished.
Activate/deactivate the tuning before the ride (when the e-bike is standing still), not during riding.
We recommend not to exceed a speed of 35 km/h.
