SRAM 30t 94 BCD x 4-Bolt 11/12-Speed X-Sync2 Eagle Chainring BlackSRAM 30t 94 BCD x 4 Bolt 11 12 Speed X Sync2 Eagle Chainring 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