Beast of a motor. Special 4900rpm rated QS 120 v3 Required 14t front sprocket sold separately.   QS120 V3 BLDC inner rotor motor, 60mm magnets, 5 poles Rating: 4,900rpm (higher w/ flux) Rated: 2,000w, 80a, 72v, 120NM torque Peak Power: 11kw Top Speed: 50mph+ (depending on controller/tune) Recommended Tune: 125a (150a peak for max 20 seconds) Gear Ratio: 1:2.35 Sprocket: 14-tooth Waterpoof Rating: IP66 Thermic Probe: KTY82/122 included Working Temperature: 70-120 degrees Celsius (150C peak) Hall Sensor: Single hall set with waterproof connector Cooling: Air Max Efficiency: <93% Battery Line: 150a peak (recommended) Gear reduction: Yes Motor mount bolts available upon request with purchase