Shimano ultegra r8000 11 speed rear derailleurnow compatible with a wider range of cassette tooth count options, the ultegra r8000 11 speed rear derailleur delivers has been optimised by shimano to offer fast and accurate gear shifts with minimal rider effort'. '.strtoupper('i')n addition to the slick shifting, it also adopts the ldquoshadowrdquo cage design to sit closer to your bike's frame'. '.strtoupper('t')his improving its aerodynamics and protects it should you be unlucky enough to have a crash'. '.strtoupper('r')ace ready, its made in two different cage sizes to suit your cassette size preference.key features material alloy colour grey speed 11 speed compatibility all shimano 2x11 speed road drivetrainscage size separate short and medium cage size options cassette size capacity short cage 11 25t to 11 30t medium cage 11 28t to 11 34t total capacity short cage 35t medium cage 39t mounting standard hanger mount or direct mount clutch type no shadow technology low profile design precise and accurate shifting manufacturer's part number short cage rd r8000 ss medium cage rd r8000 gs weight short cage 200g medium cage 210gtechnologies shadow rd traditional derailleurs extend wider than the profile of your bike'. '.strtoupper('w')ith its low profile design, shadow rd reduced main derailleur body is a more compact derailleur that fits closer to the frame, with more direct cable routing'. '.strtoupper('s')hadow rd maintains a consistent distance to the cassette for increased shift stability'. '.strtoupper('t')he reduced body width creates a sleek and smooth appearance, ensuring less damage in a crasha 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.