Campagnolo's Super Record Rear Derailleur is the choice of professionals and is a perfect fit for your dream bike. Its arresting beauty is entwined with the highest technical precision available. Campagnolo uses an advanced-parallelogram design for precise, fast shifting every time. The construction groups carbon and cold-forged-aluminum hardware to create an ultra strong and extremely light derailleur. Plus, the pulleys roll on super-efficient ceramic bearings and are made from a special material that renders the drivetrain silent.