Margaret Winchcomb, of the Parliamentary Advisory Council for Transport Safety, said it was Amazon is fuelling the illegal e-bikes menace by selling Chinese conversion kits for under £500 that turn regular bicycles into souped-up machines. Our reporter transformed a second-hand pedal bike into an illegal e-bike after buying a conversion kit from Amazon for under £500. But there are growing calls for a ban on sales amid a rise in accidents and muggings involving rogue e-bike riders. Under UK law, e-bikes must have electric motors limited to a maximum power output of 250 watts and must stop providing power at 15.