From pswpower 

Bafang SWX02 48V 500W RM G020.500.DC Rear Freewheel Rear Cassette Wheel gear Motor for Electric Bicycle Conversion Kit 

Motor: you can choose SWX02 Rear Freewheel Motor or SWX02 Rear Cassette Motor

You can buy KT36/48SVPR-EP02B 20A controller for the waterproof cable motor, KT24/36SVPR-HRD01 20A  for the Normal cable motor.

The laser Code is 48V 500W motor:

 If you want use 36V Battery for this motor,you can buy  KT36/48SVPR-EP02B 17A controller for the waterproof cable motor, KT24/36SVPR-HRD01 17A  for the Normal cable motor.

Motor Cable:you can choose 0.75M 9 PIN Waterproof cable or 0.5M 9 PIN Waterproof cable or 0.5M 9 PIN Normal cable or 0.5*2M 9 PIN Waterproof cable or 0.5*2M 9 PIN Normal cable 

Please note the cable you need when placing the order

SWX02 Rear Freewheel Motor

Position      Rear Motor

Wheel Diameter (Inch)      20/26/27.5/28

Construction    Gear drive

Rated Voltage (DCV)    36V 350W/48V 500W

Rated Speed(km/h) 36V 350W RPM 195

48V 500W RPM 261

Max Torque      45 N.m

Efficiency (%)   ≥ 80

Color    Black

Weight (kg)      3.3

Noise Grade (dB)   ＜55

Operating Temperature    -20 - 45℃

Mounting Parameters      

Brake   Disc Brake

Installation Widths (mm / OLD)    135

Max. Housing Diameter (mm)       158.5

Cabling Route  Through Shaft, Right

Cable Length(mm), Connection Type 250 G9.1

Gearshift    Freewheel(6S/7S/8S/9S)

Spoke Specification     36H*13G

Further Specifications

Speed Detection Signal (Pulses/Cycle)      6

Reduction Ratio     1:05

Magnet Poles (2P)       20

Tests &