SRAM 38T DIRECT X-SYNC EAGLE 3mm BOOST POLAR GYNewly redesigned X Sync 2 provides better chain retention resulting in a smoother, more efficient pedal feel New aggressive tooth profile reduces friction and debris build up for superior longevity Compatible with all Sram Eagle 12 speed and Sram 11 speed 1x drivetrains Robust forged and machined aluminum for ultimate strength Designed to pair flawlessly with the Eagle chain