Shimano ultegra r8000 rear derailleur rear derailleurs
The groupset offers two specific rear derailleurs one for cassettes 11 25 and 11 30 and one for cassettes 11 28 and 11 34 securing a smooth ride in even the highest and steepest mountain areas due to the integrated shadow rd technology with its race proven low profile design the derailleur is more compact and fits closer to the frame ensuring less damage in a crash