Shimano ultegra r8000 11 speed rear mechthe ultegra r8000 11 speed rear mech reduces shifting effort at the lever whilst retaining a quick and precise response at the rear featuring integrated shadow rd technology with its race proven low profile design the rear derailleur is more compact and fits closer to the frame ensuring less damage in a crash featuresshadow rd technologylow profile designprecise and accurate shiftingmaximum front difference 16tweight 200g short cagetechnologiessh