Campagnolo Super Record 12, Rear Derailleur, Speed: 12, Cage: Medium, Carbon12 speed Super Record rear derailleur Unidirectional carbon outer cage and carbon fibre reinforced technopolymer body Only one cage length, compatible with cassettes up to 11 32 3D Embrace technology increases chain wrap by keeping the pulleys as close as possible to the cogs vertically and horizontally, which improves shifting speed and drivetrain longevity 12 tooth jockey wheels with ceramic bearings reduce friction to a minimum Compatible with