MRP SXg Single-Chainring Guide Extra Retention For Aggressive Riding Mountain biking can be rough on your bike. Having things like a chain guide with a skid plate will help prevent any damage to your bike while you're riding. The MRP SXg Single-Chainring Guide integrates the lower skid with a secondary TPU guide. This provides extra retention for aggressive riding without the added friction of a pulley system. It features swingset hardware that allows guides to rotate apart for easy chain installation. Features Full-sized upper and lower guides with quiet, TPU co-molded inner Installs and adjusts with a single 4mm hex Compatible with chain lines 49mm and wider, including Boost 148Compatible with 1x7, 1x9, 1x10, 1x11, and 1x12 drivetrains Nylon skid attached directly to the integrated lower guide Compatible with32-36 tooth chainring sizes | Mrp | Sxg Single-Chainring Guide Sxg Iscg-05 Black | Nylon