Parts such as the Tire: Tube,2.75/3.00-18, Tube, 2.25/2.50-18, Tire,fr,2.50-18 4pr,y, Tire,rear,2.75-18 4pr are included in the Kh100g7 1986 Usa Tire parts fiche.
The Tire assembly is constructed from several parts from which the Tire,fr,2.50-18 4pr,y is the most expensive.