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Rotor Flow crankset

The extra bolt hole allows for an extra five steps of adjustment for Rotor's Q-Rings. Note the lines on the spider marked "OCP," noting the regular bolt circle, and "OCP +1/2," noting the half step. Photo: Caley Fretz | VeloNews.com

The extra bolt hole allows for an extra five steps of adjustment for Rotor’s Q-Rings. Note the lines on the spider marked “OCP,” noting the regular bolt circle, and “OCP +1/2,” noting the half step. Photo: Caley Fretz | VeloNews.com