How Fast Can My E-Bike Go?
CPSC (Consumer Product Safety Committee) regulations say that a motor along cannot power a bike faster than 20mph. To help offer some details to this please note the following. Class 1 and 3 pedal assist bikes will have a motor stop propelling at 20mph. A Class 2 bike IF pedaling will continue to generate up to 28mph.
Also see What is an Ebike?
Check with local authorities or visit People for Bikes to learn about the rules and regulations in your area.