E bikes are usually grouped based on their assisted speed and throttle. The BPSA or Bicycle Product Suppliers Association classify e bikes via its motor-assisted speed, as well as the amount of work it would require to have them up to speed.
Class One e bikes, also referred to as pedelecs or pedal assists, have their electric motor activated the instance a rider starts to pedal. The legal assist it offers is only up to 20 miles per hour. Though one can pedal to a speed more than that, its motor will not go beyond such speed.
Class Three e bikes are also called speed pedelecs. They can go up to a speed of 28 miles per hour with assistance. Safety requirements are usually carried by these e bikes. They also possess speedometers. Such bikes are ideal to be used on roads with high-speed traffic.