QS273 72V 8000-10800W High Power Motor 21" Motorcycle Motorcycle Wheel Only
 

Attention:
The wheel size comes with 21" Motorcycle Wheel. 
This only include 21" Motorcycle Rear Wheel, not include any electronic parts
Optional Part: 21" Front Wheel (20x110mm Hollow Hub, support dual brake)
Axle Size: M22x18mm (Round diameter is 22mm, flat width is 18mm)

Features of the Product:
1. 72V 8000-10800W Brushless Gearless 21" Motorcycle Rear Hub Motor Wheel with 18T Single Speed Freewheel 
2. QS273 Hub Motor with dual hall sensor
3. Dropout: 164mm
4. Axle Size: M22x18mm (Consider safety problem, QS already upgrade all QS273 Motor Axle as M22x18mm, please check your frame, if not enough whether you can grind it)

QS273 Motor Size Drawing: