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.