1.Speed 60km/h with high torque,convert on mountain bike. 2.FOC sine wave dual controller, stable and comfortable riding experience. 3.Brushless gearless design, advantage on speed with long warranty and working life 4.MTX39 rim, strong and hard for the 1.9-3.0 tire. 5.Multifunctional instrument display LCD with USB port 6.Update to waterproof system and connector,high quality 7.electric bike conversion kit 48v 1500w 29