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Brunner shifted up front with an Ultegra R8070 Di 2 front derailleur. Eric Brunner's 2019 U23 National Championships Blue Norcross Team Edition. © A. Yee / Cyclocross Magazine

Brunner shifted up front with an Ultegra R8070 Di 2 front derailleur. Eric Brunner’s 2019 U23 National Championships Blue Norcross Team Edition. © A. Yee / Cyclocross Magazine