With a quantity of two pieces, the Bearing-ball,#6304uuc is the most used part in the Rear Wheel/Chain diagram.
sixteen components are listed in the schematic for this Zg1400b9f Concours 14 2009 Usa Rear Wheel/chain .
The Rear Wheel/chain assembly is constructed from several parts from which the Wheel-assy,rr,m.f.p.s is the most expensive.