Date:         Tue, 11 Feb 2020 08:23:46 -0500
Reply-To:     Larry Alofs <lalofs@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Larry Alofs <lalofs@GMAIL.COM>
Subject:      Re: PSI and Bars, for tire pressure
In-Reply-To:  <1284363065.1363088.1581395864910@mail.yahoo.com>
Content-Type: text/plain; charset="UTF-8"

I am very satisfied with Discount Tire overall, but you have to keep an eye
on them.  I took our Forester in for a puncture repair recently and they
said they would do it for free even tho the tires were not purchased
there.  Once it was on the rack a rookie employee started checking and
adjusting the tire pressures.  I asked him what pressure he was putting in
and he said 36 psi.  I asked if he had looked at the door post and it had
not ocurred to him.  I finally got him to go for 29 and 30 like I had them
in the first place.
  I have had similar situations regarding lug nut torques.

Larry A.


On Mon, Feb 10, 2020 at 11:38 PM Richard Koerner <rjkinpb@sbcglobal.net>
wrote:

>  I think that is why it is always described on the recommended tire
> pressure in every manual and booklet as "Cold" tire inflation pressure.
> Friction and rubber moving around creates heat, and resultant increase in
> tire pressure.   When you mentioned a 6-7 psi change on your 15 mile drive,
> I am assuming that is an increase in tire pressure.
>
> Right....temperature INSIDE the tire due to a combination of Ambient
> Temperature and frictional forces are what matters, and raises tire
> pressure.  Since it is all so confusing, that is why they recommend
> checking tire pressures with vehicle just sitting there, tires cold,
> ideally.  I go regularly to my Discount Tire Center for a Free air check; I
> usually walk over to a nearby store or something to let things cool off a
> little before the tire pressure check.  And...the reason for the "free" air
> check?  So they can stick their probe into the tread to measure thickness,
> and also inspect tire build date, in hopes of selling you a new set of
> tires.  Good for them!!  Still....they have these cool computer controlled
> inflation gizmos....I tell them "44 PSI, all around, including my spare"
> (valve stem sticks out through one of the holes on the underside clamshell
> holder)....and that is exactly what happens.
> Works good for me.  And yes....I will buy my next set of tires from
> Discount Tires.  On both cars.  Free lifetime spin balance too.  I gave up
> on Costco a long time ago.
> (For long time Listers...Just when you always thought there could never be
> another tire thread....ha-ha!)
>
>
>
>     On Monday, February 10, 2020, 7:53:36 PM PST, Jim Arnott <
> jrasite@eoni.com> wrote:
>
>  I see about 6-7 psi change on my 15 mile drive to town. Temp doesn’t
> change much at all. (Alistair’s cheap TPMS.) It fits great on the ledge
> under the tach. I have to pull it out and throw it on the dash about once a
> week to charge.
>
> Jim
>
> > On Feb 10, 2020, at 7:01 PM, Alistair Bell <albell@shaw.ca> wrote:
> >
> > And the pedant in you should have dope slapped me for typing pendant :-)
> >
> > Hey, on another subject, since I installed an aftermarket tire pressure
> monitoring system, I’m so surprised at the apparent change in tire pressure
> with temp changes.
> >
> > Yeah, of course it will change , but I never did the math using the old
> equations. Having this system, which include temp at the tire, shows me
> just how much the pressure changes with temp.
> >
> > Been on the van since the summer, has worked prefectures except.. during
> the dark dark periods we have here during short days and rain, the little
> solar panel on the display can’t keep up .
> >
> > Alistair
>