Campagnolo Record 12 Speed Rear Derailleur, One Size, Black

12x Record Rear derailleur for use with the campagnolo 12 speed disc or rim brake groupsets Upper body in ULTRA-LIGHT technopolymer reinforced with UD Carbon Fibre 3D Embrace Technology: Movement of the rear derailleur is designed to make the chain embrace more teeth per sprocket to guarantee maximum traction Optimised trajectory: Movement of the rear derailleur means that the upper pulley wheel is at constant distance to the sprocket in use Optimised return spring: This guarantees constant chain tension regardless of road vibration