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Rochette swapped between a 40t X-Sync 2 ring on Saturday to a 38t ring on Sunday. Maghalie Rochette's Rochester Cyclocross-winning S-Works Crux. © Z. Schuster / Cyclocross Magazine

Rochette swapped between a 40t X-Sync 2 ring on Saturday to a 38t ring on Sunday. Maghalie Rochette’s Rochester Cyclocross-winning S-Works Crux. © Z. Schuster / Cyclocross Magazine