Shimano RD-R8000 Ultegra 11-speed rear derailleur GS cage

From Shimano:

• Ultegra Shadow design rear derailleur with wide link design gives quick accurate shifts and excellent drivetrain efficiency
• Sleek appearance with Low profile Shadow design construction reduces risk of damage in a crash
• Wide outer link plates increase pivot joint rigidity to reduce shifting deflection
• Lightweight aluminium pulley cage helps reduce weight without sacrificing shifting performance
• Wide gear ratio compatible with 11-28 up to 11-34T