jmac
Casa Grande, AZ
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When the term 'cold' is used in checking tires, is it referring to tires not run on the road. If it is 100 deg outside before you hit the road will the tires measure as if having been run or does that qualify as 'cold'.
I know it may be a stupid question, but thought I would ask anyway.
jmac
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Chuck&Gail
In the Colorado Mountains
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Qualifies as "cold" as long as sun has not hit any of them yet.
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PapPappy
Wilmington, NC
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The calculations are figured with the heat that is generated by the friction of the tires running on the road.
The temperature increase is something that they can calculate based on a variety of tests. Ambient temperature will have an effect, but unless you are parking in 100 degree temps in the morning, and then driving to sub-freezing that afternoon, I wouldn't worry about it.
The temps from the Sun may have an effect, but I don't think that they are really taking that into account when they call for a "cold' temp reading.
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targaboat
sulphur springs, tx, usa
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It means measure the pressure before you start driving. Any other consideration will only frustrate you. Sometimes one just has to make allowances for certain temporary situations like sun shining on tires on one side in which case leave the pressure a little high to compensate.
Fly Boy
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wolfe10
Texas
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Good answers.
Cold is at ambient temperature (be it 0 or 110 degrees F) before driving, and as suggested before sun heats up one or more tires.
So you WILL readjust PSI at least seasonally.
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Gale Hawkins
Murray, KY
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Once we got the TPMS it just means to us before we roll since we have a dash readout all the time on all of the tires.
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Bubby's RV
CA
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The manual for our Subaru includes a correction factor for cold temperatures because they assume it will be driven in snow. I would tell you what it is, but my DW is out driving around in it.
John, Winnebago Minnie 24V
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Popsie
Livingston, TX, USA
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wolfe10 wrote:Good answers.
Cold is at ambient temperature (be it 0 or 110 degrees F) before driving, and as suggested before sun heats up one or more tires.
So you WILL readjust PSI at least seasonally. Well, I recently concluded an experiment. I set my pressures correctly once, and drove for two years without making any pressure changes. I did check my pressures in the morning on driving days, and used my IR gun at stops on the road. At the end of 2 years, my tires were at almost the same pressures as when I started out, and they were never out of line when checked in the am.
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wolfe10
Texas
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Popsie wrote:wolfe10 wrote:Good answers.
Cold is at ambient temperature (be it 0 or 110 degrees F) before driving, and as suggested before sun heats up one or more tires.
So you WILL readjust PSI at least seasonally. Well, I recently concluded an experiment. I set my pressures correctly once, and drove for two years without making any pressure changes. I did check my pressures in the morning on driving days, and used my IR gun at stops on the road. At the end of 2 years, my tires were at almost the same pressures as when I started out, and they were never out of line when checked in the am.
As long as you do not drive in widely variant temperatures, no problem.
But physics dictates that PSI will change approximately 1 PSI for every 10 degrees F. So that 0 to 110 (outer extremes cited above) would cause a PSI change of over 10 PSI.
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Deen
Vancouver, WA
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Tires are considered "cold" if they sat overnight and NOT been driven over 1 mile at low speed (and even that's pushing it in my book)
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