Updated with new head shape and lower cost- Infinite chainline adjustment between 48mm and 55mm 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 guide's 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 engineers made this guide extremely stiff and strong while keeping it light at 44g- Specific guide shaping is optimized for use with elliptical/oval and round chainrings