Experience top-tier performance with the Shimano RD-R9100 Dura-Ace Rear Derailleur, designed for 11-speed drivetrains. Weighing in at a mere 158 grams, this rear derailleur offers a perfect balance of lightweight construction and durability. The Dura-Ace RD-R9100 features Shimano's Shadow RD design, providing a sleek profile and improved shifting stability. Its carbon pulley plate ensures smooth and efficient gear changes, while the optimized spring tension delivers precise and reliable shifting performance. With a maximum sprocket size of 30T and a minimum sprocket size of 11T, this rear derailleur is compatible with a wide range of gearing options. Elevate your cycling experience with the Shimano RD-R9100 Dura-Ace Rear Derailleur, the pinnacle of precision engineering and performance.