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Old 02-24-2013, 05:49 PM   #15
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We just finished our first long trip with TPMS. We witnessed all of the discussion so far in this thread. Tires in the sun run higher pressure than the shade. Inner Duallies run higher pressure. Pressure goes up for for the first 10-15 minutes. Since we ranged from the low 10sF to the mid-70sF this trip, we got to see the differences in ambient temperature on pressure as well (some, but not as much as expected). Overall, we are glad for the extra protection provided.
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Old 02-25-2013, 11:05 AM   #16
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Originally Posted by luvlabs View Post
It is normal for your tire pressure to increase as the tire warms up. This is not going to hurt the tire.

You should continue to set your cold pressures to what is appropriate for your tire loading (110/90 psi). Lowering the cold pressures was wrong and you could be damaging your tires by running them at too low of pressure.
Agree, you are over thinking this issue.
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Old 02-25-2013, 04:17 PM   #17
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Not to hijack this thread, but a question along the same lines.

Say pressure should be at 80, in the morning I show a couple with 76, should I be adding air then, or wait until say 74?

Inquiring minds want to know.

Kaye (old, dumb broad)
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Old 02-25-2013, 06:59 PM   #18
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Check the TP in the AM before you start...don't worry about where you are going, the temp, altitude, etc...and fill them to the recommended pressure. Next AM, do it again.
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Old 02-27-2013, 12:23 PM   #19
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Not to hijack this thread, but a question along the same lines.

Say pressure should be at 80, in the morning I show a couple with 76, should I be adding air then, or wait until say 74?

Inquiring minds want to know.

Kaye (old, dumb broad)
You should set your pressure when the tires are cold (ambient temperature). The minimum pressure should be what the heaviest tire on that axle needs plus 5 to 10psi for a cushion. Here is the first of a number of posts on the topic of inflation. You might want to work your way through the blog as it will probably answer most if not all your tire related questions.
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Old 02-27-2013, 02:18 PM   #20
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Thanks, I knew they would increase, just surprised at the amount, as my car only moves a couple of pounds, max tire pressure on sidewall says 120lbs and running temps were over, thats what happens when you get new gadgets that beep and flash, Its funny how when I didn't know, I wasn't worried.

Thanks again
Bob
Bob Here is a blog post with more details on tire temperature and pressure changes.
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Old 02-27-2013, 08:33 PM   #21
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And it's not actually the maximum pressure! It's the MINIMUM pressure required to support the MAXIMUM weight rating of the tire. It's spelled out in the manufacturers literature
Likely to be a bit of debate on the interpretation, especially since you say the interpretation varies according to the size of the tyre, which seems contrary to common sense in such a standardised item as this, but one thing where there is no debate possible is that under no circumstances should the pressure rating of the rim be exceeded.
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