SRAM X-Sync 2 Eagle Chainring - 36 Tooth 104mm BCD 12-Speed BlackSRAM X Sync 2 Eagle Chainring 36 Tooth 104mm BCD 12 Speed Black. SRAM 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