The new QXL is a Q-Ring with increased ovality. It has the same shape as the standard Q-Ring, to maintain an exceptionally smooth transmission.are for runners with a predominantly fast muscle contraction (Fast Fibers). These are generally the so-called "Powerful" runners, with a muscle mass and a power peak above average (Sprinters for example). For these athletes, a higher ovality allows them to reduce negative work compared to our standard ovality. The QXL is most effective for sprinting or climbing efforts, as it allows for peak power to be optimized while dead spots become more critical.QXL chainring for Shimano road cranksetShimano Dura-Ace 9000/ Ultegra 6800 compatibleCenter distance 110 mmPosition: outside4 spokes16% ovalityAluminium 7075 100% CNCBlackFeatures:Position External Centre distance 110