Brand New16 tooth Drive axle48v 500w motor: 3000rpm rated current: 15ah, max discharging time : 160mins High Speed: 13mph Medium Speed: 10mph Low Speed: 8mph ( under the load of 143lbs, and the weight of the bike is 154lbs)Gear Ratio: 9.5:1 Torque: 1.8NmThe 48v 1000w motor : 4800rpm rated current: 18-35ah, max discharging time : 140mins High Speed : 20mph , Medium Speed : 16mph , Low Speed: 10mph ( under the load of 198lbs, and the weight of the bike is 154lbs)Gear Ratio: 9.5:1 Torque: 2.62NmTwo Differential Axles ( same length, 517mm in length)Wheel hubs: 23T Spline