Parts such as the Rear Wheel: Wheel, Rear, Bolt, Nut, Cam,rr Brake are included in the Ay50w 1999 (x) Rear Wheel parts fiche.
The sub assemblies and components that make up this Rear Wheel include this Wheel, Rear (mt3.50x12), the most expensive part.
The component with the lowest price in the REAR WHEEL schematic is the Nut.