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Nauman's Niner RLT 9 RDO frame is flat mount disc and 12mm thru-axle. Amanda Nauman's 2018 DK200 Niner RLT 9 RDO. © Z. Schuster / Cyclocross Magazine

Nauman’s Niner RLT 9 RDO frame is flat mount disc and 12mm thru-axle. Amanda Nauman’s 2018 DK200 Niner RLT 9 RDO. © Z. Schuster / Cyclocross Magazine