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SpeedBox 1.4 B.Tuning for Bosch SX (Smart System + Rim Magnet) - Qty: 1 pcs, Package: BOX

star 1 star 2 star 3 star 4 star 5(2)Rating value is 4 of 5
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Tuning chip for e-bikes with Bosch Performance Line SX motor and Rim Magnet
Unlock the 25 km/h limit and use the full power of your e-bike!

Bluetooth • SpeedBox app

The product is fully compatible with motors
Performance Line SX 4th generation
(Motor models BDU3142)
(Motor models BDU3143)
• Motor mounting: 2 upper screws

View overview of supported software versions

Not sure which one to choose? → Buyer´s Guide



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Product code: SB14BT_B_1pcs_BOX Shipping and Payment

Key features

SpeedBox 1.4 B.Tuning with integrated Bluetooth is a tuning chip for e-bikes with Bosch Performance Line SX motors mounted with 2 upper screws and a rear wheel valve magnet. It removes the 25 km/h speed limit and, thanks to the SpeedBox App, offers a unique connection between your e-bike and smartphone.

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Tuning control

Switch between the 25 km/h limit and unlimited mode

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SpeedBox App

The B.Tuning version with Bluetooth connects your e-bike to your mobile phone

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Easy installation

Thanks to clear instructions including a video, anyone can handle the installation

Compatibility

Motors: Bosch Performance Line SX mounted with 2 upper screws (with Rim Magnet)

Displays: Kiox 300, Kiox 500, Intuvia 100, Purion 200, Purion 400

Units: LED Remote, Mini Remote, System Controller

Not compatible with: CX motors, motors with a classic spoke magnet, ABS, Enviolo Automatiq

Technical specifications

Maximum speed Factory preset 35 km/h (EU) / 22 mph (US). Do not change the speed limit.*
Display shows Values approx. 10 km/h lower than the actual speed
3 activation / deactivation SpeedBox App / WALK function / + - + - buttons
Custom speed limit Adjustable
Bluetooth Yes
Updates No
* After activation, the actual speed limit for bikes with US software is approx. 28 mph. The displayed value may differ.
Benefits of connecting B.Tuning version with the SpeedBox App
SpeedBox marked as B.Tuning uses Bluetooth technology, which allows you to connect your e-bike to the SpeedBox App. This lets you control tuning, set a custom speed limit, monitor real-time ride data or save ride records.
Tuning control
Switching the e-bike speed limit from 25 km/h to unlimited mode.
Hide Tuning function
After activating the Hide Tuning function, tuning can no longer be activated using the walk/light button on the e-bike.

Remote updates

Bosch regularly releases new firmware versions for its motors, which may affect compatibility with our products or increase the risk of tuning detection. Therefore, we strongly recommend not performing these updates in order to ensure the continued full functionality of our products.

However, we continuously respond to these changes by updating our firmware. One of the biggest advantages of the B.Tuning version is the ability to update your SpeedBox directly via the SpeedBox App – without the need to purchase a new chip, even if you have already updated the system.

If we have tested and confirmed compatibility with the latest Bosch firmware and your chip includes the so-called Factory Bootloader (the icon is marked on the back of the chip), you can safely update your SpeedBox via the app.

Installation

Installing the device is easy and intuitive. Choose the option that suits you best – a video guide, a printed manual, or a detailed step-by-step picture guide.

Video guide

You can find a detailed installation and tuning activation procedure on our YouTube channel

Printed manual

Inside the product package you will find a printed manual including a wiring diagram for connecting the chip to the motor

Step by step

The illustrated guide will walk you through the installation step by step — from removing the motor cover to the test ride. Each step is accompanied by photos and clear explanations.

User manual →

Recommendations for trouble-free SpeedBox operation

  • Keep the e-bike turned on after each ride until the “Countdown” (distance recalculation) is completed.
  • During short stops, keep one foot on the pedal to prevent the countdown from starting.
  • During longer stops, allow at least part of the countdown process to complete.
  • Do not disconnect the display before the countdown is finished.
  • Do not perform software updates – disable automatic updates.
  • Always activate/deactivate tuning before or after the ride, not during.
  • Do not increase the set maximum speed of 35 km/h.

Overview of supported software versions:
Click the image below to view the complete compatibility chart.

Compatibility chart – preview

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Warning

  • Rules for using derestricted e-bikes vary by country, so check local legislation before riding.
  • SpeedBox is intended for off-road use only and you use it at your own risk.
  • The manufacturer is not liable for damage caused by illegal or improper use.
  • Installation may also void your e-bike warranty.
  • For your safety, use appropriate protective gear and ride with maximum caution.

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Bosch Motor Gen 4 - Smart System (Rim Magnet)
Bluetooth/ SpeedBox App YES
star 1 star 2 star 3 star 4 star 5Rating value is 4 of 5

PositivesInstructions are good. Works as discribbed.

NegativesThe count down process is a bit of a pain.
It would be good if it could use the factory valve stem rim magnet instead of having to put one on ...More

Was this review helpful? Yes(0) No(0)

star 1 star 2 star 3 star 4 star 5Rating value is 4 of 5

Positives- Module works fine after careful installation.
- Support team was clear, responsive and helpful.
- Communication was professional and ...More

Negatives- Module is very sensitive to installation/configuration.
- Setup requires extra care and time.

Was this review helpful? Yes(0) No(0)

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