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Rockwell used Ultegra calipers with Dura Ace rotors front and rear. Amity Rockwell's DK200 Allied Able Gravel Bike. © Z. Schuster / Cyclocross Magazine

Rockwell used Ultegra calipers with Dura Ace rotors front and rear. Amity Rockwell’s DK200 Allied Able Gravel Bike. © Z. Schuster / Cyclocross Magazine