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The tanwall Donnelly PDX WC tubeless tires were designed to inflate to a UCI-legal 33mm width. Gage Hecht's 2019 Donnelly C//C Cyclocross Bike. © Z. Schuster / Cyclocross Magazine

The tanwall Donnelly PDX WC tubeless tires were designed to inflate to a UCI-legal 33mm width. Gage Hecht’s 2019 Donnelly C//C Cyclocross Bike. © Z. Schuster / Cyclocross Magazine