Adds security to "narrow/wide" 1x10/11 and XX1/X01 drivetrains Most models accommodate 26-38t chainrings Tracked and grooved upper guide / backplate interface increases stiffness and eases installation Available D-Mount (FD), Carbon D-Mount, E-Mount/S3 (FD), Seat Tube (for MTB and CX), ISCG-05, ISCG, and BB mounting options Oval compatible CX model is only compatible with two-ring, road crank chainlines BB mounted guides are only compatible with traditional, threaded BB systems