SpeedBox 1.4 B.Tuning for Bosch SX

SpeedBox 1.4 B.Tuning for Bosch SX (Smart System + Rim Magnet) Advanced tuning chip for Bosch Performance Line SX motors (BDU3142, BDU3143) with simplified installation—no magnet simulator required. Enables unlimited speed (max 35 km/h recommended) and connects to the SpeedBox App for real-time ride data. Activation via App, WALK function, or - + - + buttons. Compatible with Bosch Rim Magnet setups and current software versions. Note: Not compatible with standard magnets or ABS systems. Check motor space and magnet type before purchase.

SIMPLIFIED INSTALLATION
No need to find a suitable position for the Magnet Simulator
DESIGNED FOR:
Performance Line SX motors of 4. Gen
(Motor Models BDU3142)
(Motor Models BDU3143)
Mounted with 2 top screws
PROPERTIES:
Maximum speed: Unlimited (max 35 km/h recommended)
Display shows:
Real speed: NO (only in SpeedBox App)
Correct travelled distance: After the countdown process is finished
Activation/deactivation (do not perform while riding):
SpeedBox App
WALK function
Buttons - + - +
Indication of tuning activation/deactivation: YES (3.5/2.5 km/h)
Compatible with:
Power Line SX motors of 4. Gen (Models BDU3142, BDU3143)
E-bikes that have a magnet attached to a valve (Bosch Rim Magnet)
The current Bosch software version
Not compatible with:
Standard magnet
ABS system
Please check your e-bike type and motor space before purchasing the product
SpeedBox 1.4 B.Tuning for Bosch SX (Smart System + Rim Magnet)
SpeedBox 1.4 B.Tuning is a premium tuning chip designed for Bosch Gen4 motors with Smart System and Rim Magnet configuration. It removes the speed limiter on your e-bike and connects via Bluetooth to the SpeedBox App, giving you full control over your ride and access to advanced performance data.
Key Features
Bluetooth-enabled tuning with mobile app integration
Removes speed limiter for speeds up to 35 km/h (or higher, adjustable up to 99 km/h)
Compatible with Bosch Performance Line SX motors (BDU3142, BDU3143)
Designed for e-bikes using Bosch Rim Magnet (not compatible with standard magnet or ABS systems)
Activation/deactivation via WALK assist or button sequence (- + - +)
Real-time speed and trip data available through SpeedBox App
Invisible mode and motor diagnostics included
Easy installation with original connectors and detailed guides
SpeedBox App Overview
The SpeedBox App connects your e-bike to your mobile phone, displaying actual speed, trip statistics, and motor diagnostics. You can log rides, compare performance, and adjust tuning settings directly from your phone. The app requires Bluetooth 4.0 or higher and is available on Google Play and the App Store.
App features include:
Tuning control
Speed limit adjustment
Trip logging and performance comparison
Invisible mode
Motor diagnostics
PIN and service password protection
We recommend downloading the app before purchasing to test compatibility and explore its demo features.
Operation & Setup
Activate tuning via WALK assist (hold “–” button) or by pressing - + - +
Display shows 3.5 km/h when tuning is active, 2.5 km/h when deactivated
Speed limit can be adjusted using a mode-switching sequence
After riding, wait for the display to show 0.0 km/h before turning off the bike
Do not activate or deactivate tuning while riding
Package Details
Contents: SpeedBox 1.4 B.Tuning chip
Important Notes
Use only on private property; not legal for public roads in many regions
May void your e-bike’s warranty
Disable automatic updates in the eBike Flow App to reduce detection risk
Always wear protective gear and follow safety guidelines
Ride at your own risk; recommended maximum speed is 35 km/h
Before installation, ensure your e-bike has been ridden at least 10 km. Connectors must be aligned correctly—do not rotate during connection.