RE: [doc] Wheels / Tires

["Chris Parnham" <chrisparnham1@xxxxxxxxxxxx>]

John,

The valves or "Schrader valves" as they are properly called, can indeed
sometimes stick. The core can easily be removed by using a special "valve
key". You then simply un- screw  the old core and screw in a new core.

 I'm surprised your break down chap hadn't got the gear. They are the same
on all car valves, whether the valve outer is rubber / metal , tube or
tubeless.  It does mean that you will necessarily loose all the air, during
replacement, but that is easily replaced.

In the old days tyre fitters always removed the inner valve to deflate the
tyre before removal, but nowadays they mostly seem to use the fancy tyre
machines to let the air out as they brake the seal of the tubeless tyre.   I
was a tyre fitter 40 years ago and my tenant at work is a tyre company, so
I'm always popping around and watching them operate.

Chris Parnham

-----Original Message-----
From: jchapelhow [mailto:chapelhow@xxxxxxxxxxx]
Sent: 14 March 2004 19:23
To: doc-uk@xxxxxxxxxxxxxxx
Subject: [doc] Wheels / Tires

All.

All.

Following my trip to Derby, and my low tyre pressures measured at
that time I purchased a new digital gauge. Whilst checking the
pressure today the valve on my left rear failed.

The valve doesn't close even once the gauge has been removed. I had
to call out the breakdown chap to help remove one of the lug nuts
(replacements on order with DMUK) because the removal socket didn't
seem to clamp correctly.

There was no air in the spare but that was easily solved, perhaps
something I should check more regularly!

The car really does look odd with the space saver spare on. Time for
another think on replacement tires...


John Chapelhow
DOC 19 :'Boeing' #0737






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