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Old 10-19-2013, 06:25 PM   #11
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If they were at the right cold pressure (which is the only pressure that matters), and he lets air out of them, then they are under-inflated at that point, period.
Not true, as long as they are at max sidewall pressure they are not underinflated at any point as long as the load doesn't change.
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Old 10-19-2013, 06:30 PM   #12
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I guess we'll just agree to disagree. Perhaps Tireman9 can educate one of us.
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Old 10-19-2013, 06:40 PM   #13
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I guess we'll just agree to disagree. Perhaps Tireman9 can educate one of us.
For example my silverado tire pressure door sticker recommends 80 rears and 60 fronts what does this mean for me ?
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Old 10-19-2013, 07:02 PM   #14
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It means you have different load requirements on the front vs back tires.

I will admit to being confused by this. I see OCs point that 75 pounds is 75 pounds no matter what the temperature is, so unless a hot tire needs more pressure to support the load than a cold tire does, what OC said makes sense. But I've always heard never to let air out of a hot tire because you think it's over-pressure.
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Old 10-19-2013, 07:09 PM   #15
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It means you have different load requirements on the front vs back tires.

I will admit to being confused by this. I see OCs point that 75 pounds is 75 pounds no matter what the temperature is, so unless a hot tire needs more pressure to support the load than a cold tire does, what OC said makes sense. But I've always heard never to let air out of a hot tire because you think it's over-pressure.
Just means that you need to add air when the tire cools. Makes no sense to me to deflate a hot tire, but if that's what the man does, it can't do any harm as long as he re-inflates when the tires cool. Will say this, over inflating hot tires will definitely stretch them. We used to over inflate tires on our race car and set them in the sun to stretch them. We could get the circumference to change by as much as 3"-4" over stock, which is how we got "tire stagger".
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Old 10-19-2013, 08:10 PM   #16
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So you're saying if I set preferred cold pressure and pressure builds to 85psi on a hot day (exceeding stated sidewall pressure) I should run them at that pressure? I disagree... But to each his own. I've blown tires in the past running them at excessive pressure when hot.
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Old 10-19-2013, 08:28 PM   #17
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...
I will admit to being confused by this. I see OCs point that 75 pounds is 75 pounds no matter what the temperature is, so unless a hot tire needs more pressure to support the load than a cold tire does, what OC said makes sense. But I've always heard never to let air out of a hot tire because you think it's over-pressure.
I figured it out. I was right the first time.

If 75 is the right cold pressure, the tire manufacturers know that the running pressure of the tire is going to be more like 82+, and THAT is the pressure the tire needs for the load. If you let air out of the tire, back down to 75, the tire is under-inflated for the load.

In other words, a hot tire *does* need more pressure for the load: the pressure they knew it was going to be at when it got hot.
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Old 10-19-2013, 08:30 PM   #18
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So you're saying if I set preferred cold pressure and pressure builds to 85psi on a hot day (exceeding stated sidewall pressure) I should run them at that pressure? I disagree... But to each his own. I've blown tires in the past running them at excessive pressure when hot.
It's not "to each his own". This is not subjective. There is a factual answer to this. Tireman9 will be able to tell us what that is.
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Old 10-19-2013, 08:32 PM   #19
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I figured it out. I was right the first time.

If 75 is the right cold pressure, the tire manufacturers know that the running pressure of the tire is going to be more like 82+, and THAT is the pressure the tire needs for the load. If you let air out of the tire, back down to 75, the tire is under-inflated for the load.

In other words, a hot tire *does* need more pressure for the load: the pressure they knew it was going to be at when it got hot.
And the source of that objective evidence you are quoting?
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Old 10-19-2013, 08:37 PM   #20
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Everything on these forums is subjective. You do it your way & I'll do it my way. I am not going to inflate my tires to a cold pressure which will allow the pressure to increase above the stated sidewall pressure at highway speeds. Never said I would let air OUT of the tire.
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