If you are a powerful rider or have more muscle mass you may want to consider the QXL chainrings. The Rotor QXL is a Q-Ring with increased ovalization. The XL rings were developed by working with pros - many of them finding a benefit to a more ovalized ring. They have a similar shape to standard Q-Rings, ensuring exceptional drivetrain stability. QXL rings do not replace standard Q-Rings, rather complement them as each is optimized for different rider profiles and situations.
QXL chainrings are most noticeable when riding in conditions of high power delivery and consistent maximum (peak) effort, like time trials, sprints, breakaways, etc. QXL rings feature 16% Ovalization (compared with 10% on regular Q-rings). For example, a QXL 53 feels like a 57t during the power phase 49t through the typical dead spot. They are geared for powerful (or higher power output) rider/racer and ideal for higher RPM style of riding because it is easier to maintain a higher cadence