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Brunner ran Dura-Ace WH-R9170-C40 tubulars with Donnelly PDX tubulars. Eric Brunner's 2019 U23 National Championships Blue Norcross Team Edition. © A. Yee / Cyclocross Magazine

Brunner ran Dura-Ace WH-R9170-C40 tubulars with Donnelly PDX tubulars. Eric Brunner’s 2019 U23 National Championships Blue Norcross Team Edition. © A. Yee / Cyclocross Magazine