Shimano Ultegra Di2 RD-RX805 GS 11S Rear Derailleur

Featuring Shimano Shadow RD+ technology, which noticeable increases drivetrain stability and enhances gear shifting performance dramatically when riding over the most demanding terrain imaginable. The Ultegra RX805 Di2 expands the terrains that a road bike can tackle and ride on efficiently. The Ultegra RX805 borrows elements of its design from mountain bike drivetrains, enabling it to perform exceptionally over the roughest off-road conditions. This derailleur provides exceptional shifting performance, superb chain stability, which virtually eliminates chain dropping and it functions silently.