Class 1: When it has a top speed of 20 mph and an electric motor that works only with pedaling (pedal assist).
Class 2: If equipped with a throttle-actuated motor. That motor must cease to assist when the e-bike reaches 20 mph.
Class 3: A bicycle with a motor that provides assistance only if the rider is pedaling and should cease to assist when the e-bike reaches 28 mph. Class 3 e-bikes are also known as pedelec bikes. Class 3 is the most restricted classification, and some states impose additional safety restrictions for riders on Class 3 cycles.