WellShooter2
SE New Mexico
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Joined: 03/20/2009
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If you air them up to 80 psi at mid day and check them at daylight the next morning you will have about 70 psi, and if you air them up to 80 psi at day light by mid day you will have about 90 psi. Without ever pulling it a mile. Ambient temperature and sunshine or the lack thereof can change your tire pressures a lot. It does matter, but don't get too picky.
2008 2500HD D/A
2008 Keystone Challenger
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Grizzly128
N. Dakota
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Joined: 01/05/2007
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80psi unloaded will still be 80psi loaded (hooked up), temperature affects pressure approx 1 pound for every 10 degree temperature change.
Air up tires to recommended pressure (usually max reccommended cold tire pressure on the side wall) in the cool of the morning. Good to go.
Low (underinflated) tires build heat and are the largest cause of tire failure.
Checking pressures every morning and checking tire temperature thruout the day during travel is your best insurance against tire failure. Cheap digital tire guage and a no touch infra-red temp sensor are 2 very good traveling tools.
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Yahooligan
Temecula, CA
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Joined: 11/05/2007
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Vulcaneer wrote:While the tire may change shape under a load compression, the volume remains the same. The bulge at the bottom makes the tire wider there, so the volume does not change. Nor does the PSI.
Agreed now that I've thought about it some more, the tire deforms under load and going over obstacles but that doesn't change the volume inside the tire. Sorry for the confusion. 
--
Hogan & Clan
2005 Nissan Titan CC SE 4x4
2010 Keystone Hideout 31BHSWE
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ol Bombero-JC
USA
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Joined: 06/24/2004
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Yahooligan wrote:Vulcaneer wrote:While the tire may change shape under a load compression, the volume remains the same. The bulge at the bottom makes the tire wider there, so the volume does not change. Nor does the PSI.
Agreed now that I've thought about it some more, the tire deforms under load and going over obstacles but that doesn't change the volume inside the tire. Sorry for the confusion.
It's OK, most of us knew you were wrong - even if you didn't. 
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Johno02
Lexington, TN USA
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Joined: 10/15/2004
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The answer is yes...
Noel and Betty Johnson
'99 Hurricane 2007 HHR 1 wife, 2 1/2 dogs
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FastEagle
Taylors, SC
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Joined: 03/05/2007
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Air Pressure:
Tirerack
Discount Tire
FastEagle
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Yahooligan
Temecula, CA
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Gee thanks, I feel so much better now! 
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svedspx
SoCal
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Joined: 03/27/2009
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If the tire pressure remains the same when the tires are loaded and compressed then wouldn't the same be true with air bags? I'll put 9 pounds in the air bags before loading but if I measure the pressure after loading I'll have around 17 pounds.
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itsabouttime
Midland, TX
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Joined: 09/18/2005
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There is a basic difference between air bags and tires. Tires occupy more contact area with increased loading. Contact area = weight divided by tire pressure. Air bags have a fixed base area so pressure has to change with loading.
Russ
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mr. ed
Madison, SD (currently traveling the US)
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When towing, my rear tires are at 80 PSI. When I'm running solo I reduce the pressure to 60 PSI (all 4 tires). The ride is a little smoother that way and the lower pressure is still within the recommended tire ratings (my tire size: Michelins, LT235/85R16).
Mr. Ed (fulltiming since 1987)
2007 Hitchhiker II LS Model 29.5 LKTG
2007 Dodge Ram 3500/6.7 CTD/QC/4X4/SB/SRW/6-speed man/Big Horn edition
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