Also improve your performance by using oval chainrings! Oval chainring with 10% ovality. The Q-ring has the largest diameter at the point of greatest power output and the smallest diameter at the top dead center. With the patented OCP system adjustable in 5 positions to your riding style and needs. Easy adjustment without dismantling the crank, so the different settings are easy to test. CNC milled and durable due to hard anodized surface. Closed chainring in the Aero version.