Its the heart and soul of the Record 11s drivetrain! The Record rear derailleur has always evoked competitions and wins, and still today represents for professional racers the certainty of fast and extremely precise shifting, even under load. But you dont have to be a pro to take advantage of the performance features of the Record 11-speed: the fun is for all. Technologies Ultra-Shift System Quickly take the lead and leave your rivals motionless. Features: New Upper Body With Ho (Hydraulic Optimization) Geometry In Ultra-Light Technopolymer Reinforced With Carbon Fibre Rear Derailleur Fixing Bolts In Aluminium With the same resistance and stiffness, the new two-part system makes it possible to reduce the weight by 53% compared to steel and 22% compared to titanium and prolongs the component life. Ultra-Shift Exclusive Geometry Parallelogram Maximum derailleur stiffness, fast shifting, precision, reduction of possible play. Completely New Design The new shape of the external components enables the rear derailleur to move according to a different angle and the new internal design keeps the chain nearer the cassette to ensure better power transmission, greater and more secure traction, a better chain/sprocket interface and greater durability of components subject to wear and tear. Embrace Technology The special chainring positioned inside the gear body acts on a rectangular section spring that allows the component to move along a trajectory that perfectly follows the curve of the sprockets, on both the 11-23 cassette and the new 11-29. Front Plate And Cage In Carbon Fibre Maximum rigidity, fast actuation and reduced friction. Specifications: Weight: 183 gr.- 185 gr. (medium rear derailleur to fit the 11-32 cassette)