The Eagle™ technology enables the smoothest, quietest, most durable, and most efficient drivetrain groups we have ever built. The completely new design of the X-SYNC™ 2 chainrings is the direct result of our engineers' research, who studied the performance and wear characteristics of thousands of X-SYNC™ chainrings. The longer, curved tooth shape works perfectly with the current Eagle™ chains, providing better chain management and power transfer with less friction, noise, and wear.