SpeedBox 1.5 for Bosch SX (Smart System + Rim Magnet)

Manufacturer: Speedbox
Product Code: SB15_B
Before purchasing, please make sure that your bike's motor and setup are compatible with this product. Only for Bosch Power Line SX motors Gen4 (BDU3144, BDU3145) + Rim Magnet.
Product availability
In stock, delivery time 3-7 business days
349,00 €
Affordable prices
Fast deliveries
Expert customer service
Finnish family business

SpeedBox 1.5 for Bosch SX (Smart System + Rim Magnet)

SpeedBox 1.5 for Bosch SX Smart System Rim Magnet – Power and Freedom for Electric Biking

SpeedBox 1.5 for Bosch SX Smart System and Rim Magnet is a top-of-the-line tuning kit that removes the 25 km/h speed limit set by Bosch e-bike motors, allowing you to ride at speeds of up to 35 km/h. This model is specifically designed for Bosch Smart System SX motors and "Rim Magnet" sensors. Installation is user-friendly, and activation is easily done using the WALK function on your bike's control unit. With this tuning, you can take full advantage of your e-bike’s power without restrictions. Please pay attention to the motor screw attachment points – see images!

Make your e-biking experience limitless!

 

Features:

Maximum speed: No limit (recommended maximum 35 km/h)

Display shows:

  • Actual speed: NO
  • Accurate trip distance: YES (once the calculation process is complete)

Activation/Deactivation (do not perform while riding):

  • With the WALK function or by using the - + - + buttons

Indication of tuning activation/deactivation: YES (3.5/2.5 km/h)

Compatible with:

  • Smart System displays
  • Bosch Power Line SX motors Gen4 (Models BDU3144, BDU3145)
  • E-bikes with rim-mounted magnet (Bosch Rim Magnet)
  • The latest Bosch software version

Not compatible with:

  • Standard magnets
  • ABS systems
  • SpeedBox app

 

Notes:

  • If installing SpeedBox on a new bike, ride at least 10 km before fitting the box.
  • Please check your e-bike’s exact model and motor condition before ordering this product.
  • Compatible only with e-bikes that have the magnet attached to the valve (Bosch Rim Magnet) and Bosch Power Line SX motors Gen4 (Models BDU3144, BDU3145)

 

 

Warning:

Please note that using this type of modified e-bike on public roads may be illegal. The manufacturer and reseller assume no responsibility for damages resulting from the use of SpeedBox products. E-bikes equipped with SpeedBox products must not be used on public roads, bike paths, or public places. E-bikes with SpeedBox products are for use exclusively on private property and entirely at your own risk. Use of SpeedBox may void your bike's warranty. We strongly recommend using additional safety features and protective gear to help prevent injuries.

  • We recommend that you do not update your e-bike’s firmware. Updating increases the risk of detection.
  • Disable automatic updates in the eBike Flow app.
  • Please note that the SpeedBox product warranty does not cover malfunctions caused by motor updates.
  • When making a short stop, keep one foot on the pedal to avoid starting the countdown sequence.
  • If stopping for a longer period, 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 finished.
  • Activate/deactivate the tuning before riding (when the e-bike is stationary), not during the ride.
  • We recommend not exceeding a speed of 35 km/h.

Please note that for unlocked electronic parts (including Speedbox, Speedfun, and Peartune products), there is no 14-day return or exchange policy. Non-functioning Speedbox, Speedfun, and Peartune products that are under warranty must always be sent to the manufacturer for servicing. Read the warranty terms here.

How does SpeedBox 1.5 for Bosch work?

🔧 After installation – one important step!

If your bike has an older software version, change the wheel circumference in the e-bike menu to properly activate the tuning.

🚴 Tuning activation / deactivation

  • Activate the tuning before riding, while the bike is stationary. Never activate it while riding!
  • Press and hold the “–” button for a moment (the WALK function will activate), the display will show 3.5 km/h – tuning is now active.
  • Maximum speed up to 35 km/h (you can set the limit up to 99 km/h, but we do not recommend exceeding 35 km/h to avoid error codes).
  • Deactivate the tuning the same way – when the display shows 2.5 km/h, the speed limit returns to 25 km/h.

🎛 If your bike doesn’t have the WALK function?

  • You can activate/deactivate the tuning by pressing the buttons: - + - +

⚙️ Speed limit programming

  • Switch modes in this order: TURBO ➝ eMTB ➝ TOUR+ ➝ ECO ➝ TOUR+ ➝ eMTB ➝ TURBO
  • The actual speed limit will appear on the display
  • You can adjust the limit by briefly pressing the WALK button or by rotating the rear wheel 360° 2.5 km/h = 25 km/h
  • 3.0 km/h = 30 km/h
  • 3.5 km/h = 35 km/h
  • The setting is saved automatically after 15 seconds

🕒 After riding – important!

Leave the bike on after your ride until the speed display stops and shows 0.0 km/h – this will prevent the tuning from being detected. Do not disconnect the display before this “calculation” is complete.

 

SpeedBox 1.5 Bosch SX installation