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Nauman switched to 140mm Dura-Ace RT900 rotors this year. Amanda Nauman's 2019 DK200 Niner RLT 9 RDO Gravel Bike. © Z. Schuster / Cyclocross Magazine

Nauman switched to 140mm Dura-Ace RT900 rotors this year. Amanda Nauman’s 2019 DK200 Niner RLT 9 RDO Gravel Bike. © Z. Schuster / Cyclocross Magazine