Giant 650b Presta Valve Bike Tube 48mm - 650 x 20-23c
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Replacement tubes for 650b bikes, once a tire size for classic French road bikes, 650b is back with a vengeance on adventure and gravel bikes. These inner tubes are made from high-quality, standard weight rubber so you can keep on rolling. 0.9mm thick tube with a convenient 48mm threaded valve.