... motor: 180-250W high speed 4 Controller: 36V/48V Electric bicycle conversion kits 1. Charger: 36V/48V2. Wheel size: 20",26",28",or ... any other size according to your request3. Controller: 36V/48V4. Battery(24V/36V,10Ah/12Ah)5. Tyres for Electric bicycle, Electric ... steel case,controller,charger etc7. Motor: 180W,250W,350W,500W,800W,1500W,2000W,etc we can supply electric bicycle conversion kits