The Mark,spoke Plate is the cheapest item from this partsfiche.
twenty-three components are shown in this Cx500c Custom 1979 (z) Usa Rear Wheel exploded diagram.
A sample from the products for the Rear Wheel include: O-ring, 54.5x2.4, Valve,rim For Sp, Tire Assy.,rr., B/brg Rad N/com.
