If you are a 1x rider and can't afford to drop a chain, the Wolf Tooth GnarWolf chain guide is for you. Designed specifically around 1x wide/narrow chainrings the GnarWolf will keep your chain glued to your chainring in the roughest and muddiest of conditions. Designed for use with round chainrings 28t-36t or oval chainrings 28t-34t on bikes with an ISCG-05 Mount. Infinite vertical adjustment between 28t and 36t for round chainrings and 28t-34t oval chainrings. Due to frame and bike geometry there will be some bikes that need modifications or flat out won't work - Here are the known exceptions: Ibis Mojo 3 (will not work), Ibis Ripmo (will not work), Ibis Ripley (will not work), Specialized Stumpjumper 2016-2017 models (works with 1mm of spacers between the frames ISCG05 mounts and the guide, washers not included), Evil The Following (will not work), Santa Cruz Tallboy (will not work). 8mm of chainline adjustment via Wolf Tooth's GuideLock quick adjustment system (No shims required). Specific guide shaping is optimized for use with elliptical and round chainrings. Installation only takes a few minutes and all adjustments made easily with common 4 mm hex key. Easy chain removal without losing any of the guide's adjustments. Guide is designed for 1x use only and NOT compatible with crankset mounted bashrings. Item Specifications: Chainguide Mount Type: ISCG-05, Material: Aluminum, Max Tooth (teeth): 36, Color: Black, Weight: 44, Bashguard: No, Defined Color: Black,