QXL-Rings are more oval than the known Q-Rings. The whole chain ring has a ovality of 16%. The aero-style design of Rotor's oval QXL-Rings offers unparalleled stiffness and outstanding aerodynamic, hence they are perfectly suited for triathlon and time trial. Version for Shimano cranks with 4-arm spider and 110mm BCD. These chainrings increase ...