Product ROAD MASTER Size 27.5 inch/700C-40 Frame Aluminium Motor 250~350W brushless Rim Spoke Battery 36V8ah lithium battery Charging time 4-6 hours Max speed 35km/h Derailieur Shimano 6-speed-gears Max loading 120kg Rang 35-45km Brake Front and rear disc brake NW/GW 25KG/28KG(with battery)