Campagnolo's Record Rear Derailleur is the ultimate in shifting accuracy and precision. Campagnolo uses its advanced-parallelogram design for precise and fast shifting every time. The multi-directional-carbon-fiber/cold-forged-aluminum construction is ultra strong and minimizes the weight. A titanium hanger and pivot bolt strip more grams. The pulleys are even made from a special material that renders the drivetrain particularly silent. When you want the best, you want Campagnolo Record!