Rotor has delivered ovalized chainring technology to one-by mountain biking. Now you're able to experience increased efficiency and a minimized dead spot that will have you powering uphill and across trails faster than ever with Rotor's QX1 chainrings. Using the appropriate Rotor QX1 Spider, you are able to use the QX1 chainrings on the ROTOR REX 1. 1 and 2. 1 cranksets, the SRAM XX1 crankset, and the Specialized one-by crankset. Now you are able to reap the benefits of ovalized chainrings anywhere you ride -- road or trail. The QX1 Spider is available in one color.