The metal valve stem caps replacing a plastic caps are a different issue apart
from rubber valve stems.
Quality metal valve stem caps have a gasket to better seal the valve stem.
When you think about why that matters, picture the centrifugal force exerted
on the center pin of a Schraeder valve. The faster the wheel spins,
centrifugal force increases. The centrifugal load on the center pin of a
Schraeder valve can cause the valve to partially open. Having a quality metal
cap with a gasket will reduce (not stop) air escape through the valve stem.
Metal valve stems are in use on tubeless motorcycle wheels. Motorcycle wheels
are not threaded for accepting the valve stem.
Metal motorcycle valve stems are threaded on the exterior, securing/clamping
the stem through the wheel with gaskets and nuts.
For automotive use, I still prefer a quality rubber valve stem for
flexibility, with a metal cap. For a motorcycle, metal stems are protected
from accidental impact as they are generally in the center of the wheel, out
of harms way.
Dale
Cleveland OH
Wisdom begins in wonder.Socrates
--- On Sat, 1/23/10, Kirkwood <saltfever@comcast.net> wrote:
From: Kirkwood <saltfever@comcast.net>
Subject: [Land-speed] Tire Valves
To: "land-speed" <land-speed@autox.team.net>
Date: Saturday, January 23, 2010, 4:30 PM
Am I missing sumptin here? Paragraph 4 on page 19 says ''metal CAPS shall be
fitted to all tire valve stems''. There is no mention of replacing rubber
stems with steel. Not that I want to; but can you still use rubber valve
stems?
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