Rotor Inner Q Chainring 110X4 BCDRotor Q-Rings vary drivetrain resistance during a pedal rotation to align with your leg's natural strength spots and weak spots to boost your overall efficiency. In doing so, Q rings wisely utilize the strongest muscle groups to increase positive work, while picking up the slack in the weaker zones to reduce the negative work, potentially increasing a competitive cyclist's performance by as much as 4 seconds per km in an all-out sprint. That may sound miniscule, however it's twice the benefit of an aero wheelset, and in a sport where a second can be the difference between the top step of the podium and no podium at all; these proportions are substantial. Through Rotor's Optimum Chainring Position (OCP) you have approximately 5 degrees of adjustment meaning you can micro adjust the position of your Q Rings to suit your style by simply making corrections toward both comfort and efficiency. Machined from 100% CNC T6 7075 Aluminum, these Q-Rings are compatible with 4 bolt road crankarms and spiders. Features100% CNC-machined, 7075-T6 aluminum alloy Aero design: reinforced rigidity and aerodynamics Steel shifting pins3 OCP points (2-3-4)Designed to work with all 9, 10 and 11 speed groupsets Specific bolt covers for improved aesthetics (sold separately) | Rotor | Inner Q Chainring 110X4 Bcd 34T - Dura Ace 9100/ultegra 8000 | Aluminum