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Amazon.com : Kenda 700 x 20-28 Presta Valve Bicycle Tube (1 Pack, 700 x 20-28, Presta, 80mm) : Sports & Outdoors
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Amazon.com : Continental Race 28 700 x 20-25c Inner Tubes - Long Presta 80mm Valve (Pack of 4) : Sports & Outdoors
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