Cannondale 16x1.5-2.3'' Tube 40mm Schrader ValveThe Cannondale 16x1.5-2.3’’ Tube 40mm Schrader Valve is a durable butyl rubber with a discreet black Schrader valve to blend into your rims. Designed to hold up in the most brutal conditions as you train or race. These tubes have a 0.9mm wall thickness and passes a 24-hour air hold test before packaging.884603924976