The Spoke A,12x159 is the most widely applied product in the PA50I HOBBIT 1978 USA / 20MPH REAR WHEEL / PEDALS / CHAIN ( eighteen times ).
Some items from this specific schematic: Dist.collar, Bolt,hex.,8x35, Tube,tire, Chain Drive Pedal.
The Dist.collar is the cheapest item from this partsfiche.