Shimano Ultegra 11 Speed SS RD-R8000 Rear Derailleur The Shimano RD-R8000 rear derailleur reduces the effort required on the lever, while ensuring safety, speed and precision. The Ultegra R8000 rear derailleur is available in two specific versions: short cage for 11-25 to 11-30 cassettes and medium cage for 11-28 to 11-34 cassettes Thanks to the integrated Shadow RD technology, with its profile design lowered tested on the R9100 upper group, the derailleur is more compact and closer to the frame, ensuring less damage in the event of a fall. - New integrated compact design - Low profile design - Shimano Shadow RD - Optimized lean angle - Wide compatibility - SS short cage (11-25 to 11-30 tooth cassettes) - GS medium cage (11-28 to 11 cassettes -34 teeth)