This Electric Bike Conversion Kit can convert your normal bike to pedelec bike then you can drive an e-bike effortlessly to work. Specification: Rim size(diameter*width): 20"x4 / 26"x4 (optional) Drop out(for rear motor drive): 170mm / 190mm (optional) Model: With Display Panel / No Display Panel (optional) Controller: 1500w 48V 35A RPM: 650 Speed: Max.70 km/h Max torque: 22 N.M Compatibility: V brake & Disc brake Package size: (20"x4)55*55*26cm / (26"x4)60*60*26cm Package weight: approx. 13.5 kg / 29.8 lb Package List: 1* Rear Motor & Rim Kit 1* Controller 1* Controller Storage Bag 6* Ribbon 1* Coil Bobbin 1* Pair of Handlebar Cover 1* Thumb Throttle 2* Bike Brake Shifter 1* Pedal Assitant Sensor 1* Connection Box 1* User Manual