Deore XT rear derailleur delivers reliable and precise shifting with a stiff and lightweight open design All-alloy construction leads to lower weight without compromising strength and durability Four fluorine-coated link pin bushings make this one of the slickest shifting derailleurs on the trails High rigidity wide outer link braces the pulley body to increase pivot joint rigidity Mega9 compatible for use with 9-speed drivetrains Durable sealed bearing tension pulley for low friction and smooth running of the drivetrain Low normal spring uses the spring to select lower gears, best suited to use with Dual Control levers Can be combined with Rapidfire shifters Rubber bumper reduces noise when used on non-conventionalframe designs Weight: 239 grams SGS