Puch Maxis with a 49cc gas engine came in 1, 1.5, and 2hp versions that supported speeds from 20 to 30 mph.
Ebikes come in different classes - 1,2,and 3 - and generally have a top speed range from 20-30 mph. There are apparently some that can hit 45-50.
If I convert my '79 F150 to electric, can I drive it in the bike lane?