SRAM 30T X-Sync 2 Direct Mount Eagle Chainring 3mm Boost Offset, Lunar GrayIntense study of chain and chainring wear patterns led to the radical tooth profile that lasts longer, runs quieter and further improves chain retention. Fully CNC Aluminum ring construction Eagle technology provides an expanded, optimum, gear range for 1x drivetrains X SYNC 2 chainring design increases chain retention, wear life, and reduces friction and noise Designed to be used with Eagle 12 speed chains SRAM Direct Mount Compatibility Item