Eagle™ technology creates the smoothest quietest longest lasting and most efficient drivetrains we’ve ever made. The radical new look and feel of our x-sync™ 2 eagle™ chainring is a direct result of sram drivetrain engineers studying the performance and wear characteristics of thousands of x-sync™ chainrings. 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. - chainring size: 30 32 34 36 38 - bolt circle diameter (bcd): direct mount (dm) - speeds: 11/12 12 - compat - yaw: no - material (chainring): aluminum steel - color (chainring): black gold