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Brunner went clutch with the Shimano RX805 Di2 rear derailleur. Eric Brunner's Blue Norcross SL Cyclocross Bike. © B. Grant / Cyclocross Magazine

Brunner went clutch with the Shimano RX805 Di2 rear derailleur. Eric Brunner’s Blue Norcross SL Cyclocross Bike. © B. Grant / Cyclocross Magazine