Cannondale 29x2.1-2.4’’ 48mm Presta Valve TubeThe Cannondale 29x2.1-2.4’’ 48mm Presta Valve is a durable butyl rubber with a discreet black Presta valve to blend into your aero rims. Designed to hold up in the most brutal conditions as you train or race. Removable Core.884603631829