Campagnolo's Record Rear Derailleur is the ultimate in shifting accuracy and precision. Its arresting beauty is entwined with the highest technical precision available. Campagnolo uses an advanced-parallelogram design for precise and fast shifting every time. The construction pairs multi-directional-carbon and cold-forged-aluminum to create an ultra strong and extremely light derailleur. Plus, the titanium hanger and pivot bolts strip even more grams and the pulleys are even made from a special material that renders the drivetrain silent. When you want the best, you want Campagnolo Record!