RD-M771 XT GS rear derailleur
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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