Valve stem
From Wikipedia, the free encyclopedia
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.
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[edit] Types of valve stems
[edit] Schrader
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 (8 mm dia.)
TR-6 - Straight metal stem (8 mm dia.)
TR-13 - Straight rubber stem (11.5 mm dia.)
TR-15 - Straight rubber stem (16 mm dia.)
TR-87 - Short 90° metal stem (10 mm dia.)
TR-87C - Tall 90° metal stem (10 mm dia.)
[edit] Presta
The Presta valve is thinner and is typically only found on road bikes and more expensive bicycles because they can take more pressure.
[edit] 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.
[edit] External links
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