The shimano ultegra r8000 11 speed rear derailleur gs cage with wide link design gives quick accurate shifts and excellent drivetrain efficiency shimano ultegra r8000 11 speed rear derailleur features ultegra shadow design rear derailleur 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 wit