The Rear Wheel assembly is constructed from several parts from which the Rim,wheel is the most expensive.
Parts such as the Rear Wheel: Flap,tire, Cam, Rr. Brake, Spoke B (12x143.5), Rim,wheel are included in the Nc50 Express 1980 (a) Usa Rear Wheel parts fiche.
This schematic depicts all components used in the Nc50 Express 1980 (a) Usa Rear Wheel partslist.