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A Shimano 4600 long cage derailleur allowed Westdorp to use a wide range cassette. Steve Westdorp's Alter Cycle Gravel Bike, 2019 Barry-Roubaix. © B. Grant / Cyclocross Magazine

A Shimano 4600 long cage derailleur allowed Westdorp to use a wide-range cassette. Steve Westdorp’s Alter Cycles Gravel Bike, 2019 Barry-Roubaix. © B. Grant / Cyclocross Magazine