Some items from this specific schematic: Rim,rr,1.85x18, Band-rim,80/100-21(d), Tire,fr,80/100-21(bs), Wheel-sub Assy,rr.
The component with the lowest price in the TIRE schematic is the Nipple-spoke.
The sub assemblies and components that make up this Tire include this Wheel-sub Assy,rr, the most expensive part.