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Alter produces three down tube springs for various rider weights. Steve Westdorp's Alter Cycle Gravel Bike, 2019 Barry-Roubaix. © B. Grant / Cyclocross Magazine

Alter produces three down tube springs for various rider weights. Steve Westdorp’s Alter Cycles Gravel Bike, 2019 Barry-Roubaix. © B. Grant / Cyclocross Magazine