Item Tag: 135MM 3/8'' axle

20*4.0” 170mm Bafang 36V 48V 500w Front/Rear Cassette Hub Motor Fat bike Wheel

Installation widths（OLD）/ drop out: 170mm. Watt: 500W. Flywheel type:Cassette. Install position: Rear wheel. Motor Specifications Model: RM 500.