Originally Posted by
unterhausen
I'm pretty sure you have to de-restrict a bafang to go more than 20 unless the vendor has de-restricted it for you. But you usually have to ask.
The Bafang 750 watt mid-drive I bought in August can do 28mph when riding singlespeed (44x17) using the throttle (simply can't pedal that fast in such gear). Haven't yet played with it enough with a derailer to find out if it increases with better gearing. Assuming it uses wheel RPM to calculate speed, it may not.