`- For double ring setup: QX2's 10% ovalization offers a scientifically proven biomechanical advantage over round chainrings \n- Optimum Chainring Position power tuning feature: 3 OCP settings \n- Made in Spain from CNC machined 7075-T6 aluminum \n- Rotor uses 60mm BCD on certain cranks to allow oval inner rings as small as 22t