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Universal Cycles -- Continental Grand Prix 4-Season 700c Tires - Width: 23mm, 25mm, 28mm, 32mm [C1031123, C1031225, C1031428, C1031432]
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Amazon.com : Continental Grand Prix 4-Season Bicycle Tire (700x23, Wire Beaded, Black) : Bike Tires : Sports & Outdoors
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