Deore XT rear derailleur delivers reliable & precise shifting with a stiff & lightweight open design All-alloy construction leads to lower weight without compromising strength & 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 Mega 9 compatible for use with 9-speed drivetrains Durable sealed bearing tension pulley for low friction & smooth running of the drivetrain Top normal spring uses the spring to select higher gears best suited to use with Rapidfire shifters Can be combined with Dual Control levers Rubber bumper reduces noise when used on non-conventional frame designs Weight: 239 grams SGS