Main Features Oval Chainring Rotor Q-Ring Black InteriorQ-Rings have been designed to improve your performance by varying the resistance of the drivetrain in relation to the strength and weakness of your legs during pedalling. Q ring rotorOval Q-Ring chainrings give your performance a boost by modifying resistance to pedaling, based on the natural strength and weakness of the legs. They make better use of stronger muscle groups (increasing positive work) and compensate for weaker areas of the pedal stroke (reducing negative force), which is commonly known as dead center.Through OCP technology, with its different positions we can adjust the point of greatest ovality of the Q-Ring to coincide with our maximum torque, thus minimizing the dead point of the pedal stroke (moment in which no force is generated on the cranks, since that one pedal is at the highest point and the other is at the bottom).Its different Optimum Chainring Positions (OCP) will allow you to improve your experience by orienting your chainrings to the most productive part of your pedal stroke thanks to the subtle but efficient 10% ovality.100% CNC machined from 7075-T6 aluminium, they have steel gear pins.Compatible with groups of 9, 10 and 11 speeds.Q-Rings work with your body's biomechanics for maximum efficiency, allowing you to go further, faster, and with less fatigue.