Eagle Technology creates the smoothest, quietest, longest lasting, and most efficient drivetrains Sram has 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.