I have 2 elec hubmotor bicycles. The 20” i made myself for free.
And the 26” cost me $400 for the front wheel with hubmotor.
Former was clocked at 15mph. Latter 30mph. Both of which is faster than i care to slide on asphalt.
Basically i use my 36vdc 20” elec bike for short little trips down to the pool or 711. The 48vdc 26” bike needs new batteries and im broke. Both have banana seats and high handlebars. Very cool bikes. Former was a childs bmx and latter a schwinn cruiser.
One of these days, I’m going to learn how to build one.