SpeedBox 1.5 B.Tuning for Bosch SX | Smart System + Rim Magnet

For the newer Bosch Performance Line SX motor revisions. The SpeedBox 1.5 B.Tuning removes the 25 km/h limit on SX Smart System bikes with rim magnets, with full SpeedBox App support — real speed in-app, adjustable limits, invisible tuning and over-the-air chip updates.

Compatible with: Bosch Performance Line SX Gen 4 motors, models BDU3144 and BDU3145. Earlier SX motors (BDU3142/3143) need the SpeedBox 1.4 — check your motor model in the Flow app or ask us before ordering.

Keyed connectors, reversible install, lifetime functionality warranty. Fitted while you wait at Grace and Pace, Alphington.

Important: private property use only — a tuned e-bike must not be ridden on public roads, paths or trails in Australia. Tuning may affect your bike manufacturer's warranty. The rider is responsible for complying with all applicable laws.