Rotor qx1 narrow wide oval road chainring the qx1 has an increased ovality of 12 5 to help you accelerate better feel less muscle fatigue experience smoother torque and better grip off road the alternating thickthin tooth profile keeps your chain from dropping in even the worst conditions read the interview with cedric gracia on oval chainrings here features narrowwide profilehelps climbing grip and tractionprevents chain drops and need for chain tensionerfully compatible with rear clutc