Hi
I've dug out and old e bike i built afound 5 years ago. It has a bmc hub motor( I'm not sure if it was a v2 or v4 ) it was the model with most tourque. A bmc 48v 50a controller and a 48v 20ah ping lifepo4 battery pack
I'm replacing the battery with a 52v 14ah battery with Samsung 30 q cells...