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Challenge Grifo Pro Gravel/Road Bike Tire - 700 x 33, Tubeless, Folding, Black/Tan, Handmade – Bicycle Warehouse
Challenge unveils Grifo Race clincher, hints at new gravel and fat bike tires, colors | Road Bike, Cycling Forums
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Amazon.com : Challenge Grifo Cross Open Tubular Tire (Clincher) (Black/Brown, 33-mm) : Bike Tires : Sports & Outdoors
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Amazon.com : Challenge Grifo Cross Tubular Tire (Black/Brown, 33-mm) : Bike Tires : Sports & Outdoors
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