Ultegra Shadow design rear derailleur with wide link design gives quick accurate shifts and excellent drivetrain efficiencyKey Features:Sleek appearance with Low profile Shadow design construction reduces risk of damage in a crashWide outer link plates increase pivot joint rigidity to reduce shifting deflectionLightweight aluminium pulley cage helps shave off the grams without sacrificing shifting performanceWide gear ratio compatible with 11-28 up to 11-34t