The Lower Only guide allows for simple drivetrain protection as a bash only, or as bash with added retention. Also for use with bikes like the Evil Insurgent that have integrated guides or idler pulleys. A stiff aluminium back plate anchors the guide, and a modular assembly allows riders to choose from one of two sizes of bash guard (30T max and 34T max) and remove the lower slider completely. All polycarbonate parts are now solvent resistant, so they won't get brittle or crack after exposure to lubes and cleaners like other guides. The Gen2 Stealth idler is softer to cut down on noise.