The rear motor is default to rear thread(freewheel) motor, which is compatible with rotating thread freewheel. 36V 250W 350W 500W Brushless Geared DC hub motor for. 48V 1000W 1500W Brushless Gearless DC hub motor for Mountain Bicycle.
M Maximum efficiency: >=88% Wheel diameter: Approx. 20in Wheel width: Approx. 4in the rear drive is 170mm Size of controller:14.7cm8.3cm4cm Package included: 1 x Wheel 1 x Controller 3x Trigger Shifter 2 x Shifters 1 x Shifters Clip 1 x Binding Post (Yellow Box) 4x Ribbon.