Pirelli SporTube TubeThe SporTube is the most classic cycling butyl inner tube; the standard interpretation of the most used air retention system in the world. A complete range offers the size and specification for every kind of cyclist and discipline, from road cycling to urban commuting. Butyl construction Disc and rim brake compatible Black valve stem Pirelli SporTube Tube 700 x 42 50mm, 48mm Presta Valve Labeled Size: 700 x 42 50 ISO Width (mm): 42 , 43 , 44 , 45 , 46