Shimano Nexave RD-C505 Rapid Rise 8 Speed Rear Derailleur - DamagedShimano Nexave RD C505 Rapid Rise 8 Speed Rear Derailleur An 8 speed smart cage pulley plate is used to provide elegant smooth shock less shifts across the cassette. The mech body uses a low normal (Rapid Rise) spring to further assist high load downshifts and a wheel type cable guide contributes towards the light action gear shift. Please note: rapid rise means the derailleur goes from top to bottom as cable tightens not like conventional