1.Speed 70km/h with high torque,convert on mountain bike. 2.Waterproof motor connector, 3mm² motor cable could afford a big power and current. 3.FOC sine wave dual controller, stable and comfortable riding experience. 4.Brushless gearless design, advantage on speed with long warranty and working life 5.MTX39 rim, strong and hard for the 1.9-3.0 tire. 6.Multifunctional instrument display LCD with USB port 7.2000 watt electric bike kit 48v 52v 29