The Sram Eagle X-Sync 12S chainring features a new design called X-Sync 2 and Super Light weight. The longer, positive-rake tooth shape has been designed to work perfectly with the new Eagle chain to increase chain retention and overall pedaling efficiency, while decreasing friction, noise and wear. Features X-Sync 2 chainring design increases chain retention, wear life, and reduces friction and noise. Designed to be used with Eagle chain. Super light construction. Real weight 3 mm offset (Boost): 59g (32T), 62 g (34T), 69g (36T). Real weight 6 mm offset (Standard): 60g (32T), 63 g (34T), 68g (36T). Technology X-Sync 2X-Sync 2 Eagle is the next evolution of Sram X-Sync technology. The aggressive teeth design provides better chain retention for a smoother, more efficient pedal feel. With a focus on long wear-life, the X-Sync Eeagle design reduces friction and the accumulation of mud, grit and grime.