Rotor Q outer ring Rotor Q-Rings work in unison with your body to ensure every muscle movement translates to forward momentum, and no energy gets wasted. Q-Rings take advantage of your maximum power effort by lessening the time spent in the dead spots of a pedal rotation. The subtle but efficient 10% ovality combined with an unprecedented orientation factor yield an improved pedal stroke marked by performance. Choose from 5 Optimum Chainring Positions (OCP) to fine-tune your improved riding experience and go further and faster with less fatigue. Features 100% CNC-machined, 7075-T6 aluminum alloy is lightweight and strong Steel shifting pins provide snappy and reliable up shifts 5 OCP points (4 points in 50/34) customize your ride to reap maximum benefits Designed to work with all 9, 10 and 11 speed groupsets Specifications Size: 50t, 52t BCD: 110 Weight: 79g | Rotor | Q Outer Chainring | Black | 52 Tooth | Aluminum