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Valve
From WikiPedalia
The part of the inner tube that permits air to be added. There are three types used on bicycles, Presta, Schrader, and Woods
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| Schrader valve | Presta valve | Woods valve |
If you want to convert a rim drilled for Presta valves to accept Schrader valves, drill it out with a 21/64" drill bit. A Presta tube may be used in a rim drilled for a Shrader valve, but it is advisable to install a grommet in the valve hole.
