Oval Rotor Q-Rings increase the power stroke by minimizing the intensity of the "dead spot" zones. For 5-arm spider with 110/60mm BCD. For Rotor REX 1.2; REX 2.2 and REX 3.2 cranks. 36/22 and 38/25T gear ratio for 29" MTBs.
Spider and Chainrings combination of a 46 teeth outer Chainring and a inner 30 teeth chainring, merged together to a spiderring with direct mount. It eliminates frame interferences that can cause problems on 30 teeth inner chainring.