SRAM X-Sync 2 Direct Mount Eagle Chainring 3mm Boost Offset - Intense study of chain and chainring wear patterns led to the radical tooth profile that lasts longer, runs quieter and further improves chain retention.Designed to be used with Eagle 12-speed chainsEagle technology provides an expanded, optimum, gear range for 1x drivetrainsFully CNC Aluminum ring constructionSRAM Direct Mount CompatibilityX-SYNC 2 chainring design increases chain retention, wear life, and reduces friction and noise