The Tire assembly is constructed from several parts from which the Tire,rr,2.75-18 6pr K is the most expensive.
Parts such as the Tire: Tube-tire,2.50-18 Tr6, Tube,2.75/3.00-18, Tire,fr,2.50-18 4pr F, Tire,rr,2.75-18 6pr K are included in the Ar80c5 1987 Usa / Mph Tire parts fiche.