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Valve Stems. Valve stems are required with every wheel and tire combination. When replacing only the tires or wheels, we highly recommend that the valve stems be replaced. If you choose not to purchase valve stems, simply select Remove From Cart.
Once the tire is at the correct pressure, the pump valve is removed from the tire, and the cap can be replaced on the tire valve. There are two types of tire valves to which the bicycle tire pump attaches. These are the Presta valve and the Schrader valve, with the Presta valve being the most popular.