Youll be really impressed by the functionality of the Shimano RD-5800 105 Rear derailleur. It has a high-quality spring mechanism that makes shifting easier and quicker. It is just as easy to adjust and offers a wide range of gears thanks to its 11-speed compatibility. It is made of aluminium and is thus not too heavy. The Shimano RD-5800 105 Rear derailleur is an extremely versatile component for all your cycling needs!