Product list:

Bafang 36V/48V 500W 20*4.0inch Rear Motor Wheel Cassette Type (With Tire and Tube)

135mm 3/8" axle front wheel 20*4.0inch (With Tire and Tube) 

Motor Specifications:

Model: RM 500.DC

Install position: Rear wheel

Volt: 36/48V

Watt: 500W

Installation widths（OLD）/ drop out: 170mm

Reduction ratio of 1: 5

Brake: Disc brake

Flywheel type:Cassette

Color: Blue/Orange/Red/White

Peak Torque: 80Nm.

Operating teperature: -20--40℃

Noise(dB): < 55

Efficiency(%): > 80