Re: [Healeys] Conclave tire pressure change

[warthodson--- via Healeys <healeys@autox.team.net>]

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Assume for for a moment that the tire is ridged. It would be like a ridged,=
 sealed box. The pressure in the box, for example 30 PSIG would not depend =
upon the outside atmospheric pressure. If the box were taken to a higher el=
evation, the pressure inside the box would not change. But if the temperatu=
re were higher or lower the pressure in the box would change.=C2=A0However,=
 since the tire is not 100% ridged, the tire would slightly expand at a hig=
her altitude/lower outside pressure which would result is a slightly lower =
PSIG. The question in my mind is by how much?
Gary

-----Original Message-----
From: richard mayor via Healeys <healeys@autox.team.net>
To: healeys <healeys@autox.team.net>
Sent: Mon, May 24, 2021 5:04 pm
Subject: [Healeys] Conclave tire pressure change

Who knew this would have any controversy?=C2=A0 The tire pressure change ha=
d nothing to do with temperature.=C2=A0 The only difference is in altitude.=
 Just like the percentage change of oxygen in the air as you go up in altit=
ude, there is a change in the atmospheric pressure as you go up in altitude=
 .... they both go down.=C2=A0=C2=A0 The pressure in the tire, as measured =
by the gauge, is relative to the ambient pressure.=C2=A0 I knew this before=
 leaving Portland so I lowered the pressure in all my tires to 29 psi.=C2=
=A0 I had assumed that the pressure would go up about 3 pounds.=C2=A0 It ac=
tually went up 4 pounds.=20

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<div style="color:black;font: 12pt Comic Sans MS, sans-serif;">Assume for for a 
moment that the tire is ridged. It would be like a ridged, sealed box. The 
pressure in the box, for example 30 PSIG would not depend upon the outside 
atmospheric pressure. If the box were taken to a higher elevation, the pressure 
inside the box would not change. But if the temperature were higher or lower 
the pressure in the box would change.&nbsp;
<div>However, since the tire is not 100% ridged, the tire would slightly expand 
at a higher altitude/lower outside pressure which would result is a slightly 
lower PSIG. The question in my mind is by how much?<br>
Gary<br>
<br>

<div style="font-family:arial,helvetica;font-size:10pt;color:black"><font 
size="2">-----Original Message-----<br>
From: richard mayor via Healeys &lt;healeys@autox.team.net&gt;<br>
To: healeys &lt;healeys@autox.team.net&gt;<br>
Sent: Mon, May 24, 2021 5:04 pm<br>
Subject: [Healeys] Conclave tire pressure change<br>
<br>

<div id="yiv6186144305">
<div dir="ltr">
<div>Who knew this would have any controversy?&nbsp; The tire pressure change 
had nothing to do with temperature.&nbsp; The only difference is in altitude. 
Just like the percentage change of oxygen in the air as you go up in altitude, 
there is a change in the atmospheric pressure as you go up in altitude .... 
they both go down.&nbsp;&nbsp; The pressure in the tire, as measured by the 
gauge, is relative to the ambient pressure.&nbsp; I knew this before leaving 
Portland so I lowered the pressure in all my tires to 29 psi.&nbsp; I had 
assumed that the pressure would go up about 3 pounds.&nbsp; It actually went up 
4 pounds. <br>
</div>

<div><br>
</div>
</div>

</div>
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