If your electric bike can reach 15.5mph, it could be classed as a moped. Electric bikes must comply with the Electrically Assisted Pedal Cycles - EAPC - (Amendment) Regulations 2015. They must have: Pedals capable of propelling the bike A max power of no more than 250W A max speed, with power assistance, of 15.5mph: you can go faster, but only under your own pedal power If your bike is classed as a moped, then you’ll have to tax it and take a Compulsory Basic Training (CBT) course. Mopeds are required to have insurance by law, so you’d have to pay for that too.