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Rockwell used Ultegra R8070 flat mount calipers and Dura Ace RT900 rotors. Amity Rockwell's DK200 Allied Able Gravel Bike. © Z. Schuster / Cyclocross Magazine

Rockwell used Ultegra R8070 flat mount calipers and Dura Ace RT900 rotors. Amity Rockwell’s DK200 Allied Able Gravel Bike. © Z. Schuster / Cyclocross Magazine