Upgrade your road bike with the Shimano Ultegra RD-6600 Rear Derailleur. This used derailleur is compatible with Dura Ace, 105, and Tiagra brands 2x10 drivetrains and features a short cage length. Its bolt-on mounting type and 10-speed capability make it an ideal choice for any road cycling enthusiast.

The shifting is smooth and precise, with strong tenting on the spring. Working perfectly.