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Challenge makes Pro-only Team Edition Red cross tubulars available for very limited time - Swiss Cycles
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Amazon.com : Challenge Grifo Cross Tubular Tire (Black/Brown, 33-mm) : Bike Tires : Sports & Outdoors
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Tire Review: Challenge Grifo Open Cyclocross Tire Review - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media
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