I`m Pete and am an avid E bike builder with varying degrees of success based on talent or lack of. My latest are 2 Trek Roscoe 7`s which my son and I burn around on. Good to meet you all.
My Trek is a Roscoe7 19.5 frame, 27 inch wheels with 2.8 Rocket Rons Tubeless, Battery is 48V 35ah through a generic 40A sine wave controller, 1500W peaks at 2000W. Custom battery box built myself. Its done 2500 miles trouble free, will touch 40mph will cruise happily 35mph and very comfortable.
My sons bike is identical apart from 80A sabvoton controller which needed extra customisation on the battery box, his bike does 40 easily and leaves mine standing on acceleration.