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Stephens ran the popular GravelKing SK tires that had the new + casing. Mat Stephens' 2019 DK200 Factor Vista Gravel Bike. © Z. Schuster / Cyclocross Magazine

Stephens ran the popular GravelKing SK tires that had the new + casing. Mat Stephens’ 2019 DK200 Factor Vista Gravel Bike. © Z. Schuster / Cyclocross Magazine