This schematic depicts all components used in the Km100-a3a 1978 Usa Canada / Mph Kph Wheels/tires partslist.
Some items from this specific schematic: Tire,250-16 Nt108a F, Tire,2.50-16,nt-102, Band,rim, Spoke-outer,fr,146.5m.
The Wheels/tires is made up of components including this Rim,1.40x16w which is the most expensive.