QXL-Rings are more oval than the known Q-Rings. Aero QXL-Rings increase your power by emulating a Rotor System crankset in the power stroke and by minimizing the intensity of the "dead spot" zones. With 16% ovality for 130mm bolt circle diameter.
Superlight and precise cassette, made of high strength steel combined with 7075 heat treated alloy. Surface coating reduces friction and increase durability. Compatible with ROTOR UNO and other 11s groupset.