SRAM X-Sync 2 Eagle Chainring - 104mm BCD - 12-SpeedSRAM X SYNC 2 Eagle 1x chainrings provide a high level of performance and durability. The aggressive tooth design provides better chain retention for a smoother, more efficient pedal feel. With a focus on long wear life, the design reduces friction and the accumulation of mud, grit and grime. The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain Designed for use with a SRAM Eagle 12 speed chain 4 bolt