24v bicycle motor
id say 24v only cause have similar one fitted to my bike its does job if ur tyre from riding and legs ache then you need a hand this happens to me as ive ridin bikes all my life raced when young and still carnt get to shops on pedal bike very easy to fit and pieceof chain controller and batteries it should take 40 -50 v ill warranty it as i know its no light bulb pls ring any time sorry runs on wheel that has 2 ratchet on it one each side but u can adapt another way i run 2 little 12v batteries