The SRAM X9 2x10 Low Direct Mount S3 Front Derailleur is compatible with the current crop of E2 style direct mounts found on frames from Yeti, Niner, and Pivot. And, like its X0 big brother, this X9 is specifically designed to work in conjunction with SRAM's 2x10 cranksets. And, though, it looks nearly identical to the 10 speed X0 derailleur, X9 is separated by its use of powder coated steel for the linkage parts, as opposed to the lighter aluminum found on the X0 unit. It's made to handle up to a 15 tooth differential between the big and little rings, and its cage is shorter and narrower than a triple specific changer. This is great news for those who fear clearance between rear suspension and their front derailleur. The steel links that shape the swing of the derailleur cage have widely spaced pivots for heightened stiffness. This rigidity in the parallelogram is part of what makes X9 front shifting so quick and efficient. The SRAM X9 2x10 Low Direct Mount S3 Front Derailleur is available in either a top or bottom pull version for 39 or 42 tooth configurations. For mounting, it bolts straight into a Shimano style Direct Mount on your frame.