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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.
A lock nut to secure the stem at the wheel rim and a valve cap may also be present. The outer valve stem is manufactured in various lengths for different applications, and has a narrower diameter (6 mm) than Dunlop and Schrader valves (8 mm). The weakest point of a bicycle rim is usually the hole for the valve stem. The smaller hole for a Presta valve makes it possible to have extremely narrow wheels while maintaining sufficient strength in the wheel. The air pressure in an inflated tire holds the inner valve body shut.