SpeedBox 3.1 B.Tuning for Brose and Specialized motors

speedbox 3.0

very good seller

Speedbox 3B for Brose

Great service from TWE. Very easy to install this chip in the motor casing. Probably the hardest part is removing the crank! The first chip supplied turned out to be faulty, had to try a couple of things to confirm this. Second chip works great. Would use TWE again.

So easy to install and a great feature for the bike