A onedayproject to convert my bike to e-bike.
Well the one day was making the transmission and it was running 50km/h in the afternoon (in a private area) -the more careful design of battery packs and safety systems came later.
It is powered by around 40-50V running a BLDC motor of 290Kv and rated max 1800W. The transmission is gear ratio of around 1/11 (as I recall) -but still the motor runs too slow at low speed driving.
It very lightweight and cheap to build but you need a BLDC controller and I recommend the VESC designed by Benjamin Vedder.
I also recommend having brakes that are stronger than the motorsetup, so the fail happens to the mechanics – not the driver..
For additional details just ask or check out my Thingiverse post