Frame Material: Aluminum Alloy Color:silver-gray Battery:15AH/17AH Battery Voltage:48V(54V) Charger voltage:100-240V 2A European standard round plug Motor Wattage:250-500 W Gears:Five gears Tyre:CST 27.5*2.1/29*2.1 Brake: Oil brake Gradeability: 30° Max speed:38-42 km/h mileage of pure electric:40-60KM