Valve stem
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A valve stem is the port on a wheel that allows the tire to be pressurized. They are typically spring-loaded devices that admit air when the external pressure is greater than the internal tire pressure to allow filling.
Types of valve stems
The Schrader valve is used on both automobiles and bicycles.
Schrader valves are further classified by their material, diameter, length, and shape:
TR-4 - Straight metal stem (8mm dia.)
TR-6 - Straight metal stem (8mm dia.)
TR-13 - Straight rubber stem (11.5 mm dia.)
TR-15 - Straight rubber stem (16mm dia.)
TR-87 - Short 90° metal stem (10mm dia.)
TR-87C - Tall 90° metal stem (10mm dia.)
The Presta valve is thinner and is typically only found on road bikes and more expensive bicycles because they can take more pressure(psi).
Dunlop (or Woods)
Dunlop valves were once popular in Great Britain and Asia. Their bases are wider than Presta valves, but they can be pumped with Presta pumps.External links
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All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.