Eagle Technology creates the smoothest, quietest, most durable and most efficient drivetrains we've ever made. The radically new look and feel of SRAM's 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 is designed to work perfectly with the new Eagle chain to increase chain retention and overall pedaling efficiency, while decreasing friction, noise, and wear. X-SYNC 2 chainring design increases chain retention, wear life, and reduces friction and noise. Designed to be used with Eagle chain