Shimano XT RD-M760-GS Rear Derailleur

"Trickle-down technology makes the redesigned XT rear derailleur more responsive, plus a lot more durable. The wide pivot design creates a stronger derailleur while increasing rigidity for crisper shifts. A rubber boot on the pivot body reduces noise created by derailleur slap on rough terrain. When combined with the Dual Control Shifter, the return spring allows for intuitive shifting, especially on varying terrain."