The shimano deore xt sgs m771 rear mech delivers reliable and precise shifting with a stiff all alloy and lightweight construction without compromising strength and durability shimano deore xt m771 rear derailleur features 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 shifti