Duro Bicycle Tube 24″ x 2.125/2.35/2.40″ (33mm) Standard American/Valve Review Posted on February 2, 2019 By DuskunkTagged Cycling, Duro, Outdoor Recreation, Sports & Outdoors, Tubes This fits your . Make sure this fits by entering your model number. Bicycle Inner Tube American/Schrader 33mm Valve