Cute 250W Permanent Magnet Brushless Double Geared High Speed DC Hub Motor for Electric Bicycles Model: Q-F-85SX; Voltage: 24V or 36V; Power: 120W,150W,180W,200W,250W Wheel size: 16",18",20",22",24",26" or 28" Diameter: 108mm; Weight: 1.6Kg Application: Front-driving motor Standard applicability: Front fork size is 100 mm, Other Front fork size for option(80~100mm); disc brake for option Spoke: 13G/14G; Other size for option; Hall Sensor or Sensorless for option; Advantage: Light, Silent, Strong Climbing Capacity, High Efficiency and Excellent Starting Performance. Weight:1.8KG.