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Old 08-05-2015, 10:59 AM   #1
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Exclamation how to set tire pressure when ambient is 115 degrees

We live in Arizona and are continuously hit with triple-digit temperatures for about 5 or 6 months of a year, with nights often not getting down to even 90 degrees.
How would you recommend getting an accurate reading and setting the tire pressures on our 21fbrs TT? If the outdoor air temp is high, it just adds to the pressure within the tire. The other day, our TV, which I normally maintain at about 36 psi, read about 44 all around. If I adjust it downward, then it seems to me like if the air temp dropped from 110, say, to 94 degrees or lower, wouldn't the tires be underinflated?
Do hope you guys have some good suggestions.

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Old 08-05-2015, 11:09 AM   #2
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For every 10 deg increase in ambient temp you will get about 1 psi increase. No big deal and all in the design specs. Obviously, driving also increases pressure

Set the recommended pressure in the morning even if it is 90 deg (cold pressure), before driving and before the sun beats on one or more tires as it will increase the pressure on those tires. You will have variances throughout the day and week and that is to be expected.

Expect to check pressures more often as winter approaches and temps drop (10 deg = 1 psi)


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Old 08-05-2015, 11:28 AM   #3
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How does the heat from the road affect tire pressure under these conditions? I've had 2 tire failures under these conditions over the last 2 summers..
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Old 08-05-2015, 11:34 AM   #4
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Here's some good info
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Old 08-05-2015, 12:12 PM   #5
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don't go by the charts

I also have FBRS. Just finished a 13,000 mile trip. Stock tires have 20,000 miles. I recommend 45 psi cold morning. After a few miles they will be 55 to 60 in the summer. Raise pressure to 50 cold in the winter. This worked for me.for the past 2 years
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Old 08-05-2015, 12:18 PM   #6
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My tv tires are set @ 80 psi on the rear ,
Coming home from the nashville rally they hung out @ 95 psi

With tire cold set the pressure to sidewall speck and go.

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Old 08-05-2015, 12:36 PM   #7
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Old 08-05-2015, 05:02 PM   #8
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I put 65 in mine at 80 degrees when I left Phoenix a few weeks ago. When I got to Yellowstone I added about 3 lbs each. As long as your tires are not overloaded a few lbs low is not going to matter for a short period of time.

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Old 08-05-2015, 08:27 PM   #9
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I have nitrogen in my tires on my vengeance since it was new. This summer my tire shop pumped out the old and put back the new kinda a recycled thing. They tell me the tire press maintains a pressure that is more stable and does heat up the way air does. Seems to make sense my tires never are hot while I'm traveling!
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Old 08-05-2015, 08:56 PM   #10
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Everything I've ever read consistently states to inflate to the required (or max psi) in the AM with no regard for ambient temps, because tires are manufactured to be safe thru large temperature swings. It sort of makes sense because you could, for example, set your PSI at 6am at 30 degrees and end the day in a desert at 120 degrees without changing your PSI.

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pressure, tire

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