The Deore M7200 12-speed mechanical rear derailleur carries forward all the new technology of the XT M8200 but utilizes a strong steel pulley cage in its long-cage construction. This adds nominal weight but also ups durability of an already-robust structure. The derailleur's wide link structure adds strength and its wedge-shaped design helps dodge impacts on the trail.Shadow ES design provides a slimmer stronger evolution of Shimano's pioneering chain-stabilizing Shadow conceptWedge-Shaped Design is made to move out of the way to absorb trail impacts for a worry-free rideSteel pulley cage adds extra strength and durability to the design13t upper and lower pulleysPair with the HyperGlide+ 12-speed 10-51t cassette and Deore M6200 shifter for a stout reliable fast-shifting drivetrain suitable for all trail rides (cassette and shifter sold separately)