Wolf Tooth Gnarwolf Chainguide High Direct Mount Black Rev 1Infinite chainline adjustment between 48mm and 54mm via an elliptical expanding mandrel. There are no shims required Infinite vertical adjustment between 28t and 36t round rings (28t 34t elliptical) Loosen one screw to flip the guide out of the way for easy chain removal without losing any of the guides adjustments All adjustments made with common 4 mm hex key Designed for the rigors of Enduro, heavy trail, mud and even DH riding, the Wolf Tooth