Amazon.com : 12'' x 1.75/1.95 Inner Tubes (2-Pack) Compatible with Most 12'' Kid Bikes Like RoyalBaby, Schwinn Elm/Koen, Dynacraft, JOYSTAR and COEWSKE - Made from BPA/Latex Free Premium Quality Butyl Rubber :
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How To Change A Bike Inner Tube In 11 Steps [With Pictures]