Of all the components used in this assembly the Tire,3.50s-18,y-987a is the most expensive.
A sample from the products for the Wheels/tires ('81 B2) include: Balancer-wheel,5g, Rim,rear,1.85x18, Balancer-wheel,10g, Tube,3.50/4.10-18.
In this schematic the "Spoke-inner,fr,147.5m" is used most often.