SRAM X-SYNC 2 1x chain rings provide a high level of performance and durability. The aggressive teeth 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 Color: Black Material: Aluminum Ring Position/Type: Chain Retaining Single Ring Drivetrain Speeds: 11 , 12 Chainring BCD: 104