Frame: the primary factor of a bicycle that provides factors of attachment for the assorted elements that make up the machine. Typically includes a head tube, best tube, down tube, seat tube, seat keep and chain keep, linked collectively into a frame. Derailleur: an assembly of levers, commonly cable actuated, https://bikeenginesexplained59157.myparisblog.com/35650033/the-ultimate-guide-to-bike-parts-diagram