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Old 10-25-2010, 08:32 AM   #1
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What is the correct tire pressure?

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Old 10-25-2010, 08:43 AM   #2
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Location: Surprise, AZ
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The tire pressure rating should be priinted on tehtire although it could be a maximum. My Toyos have a maximum of 120 - 122 PSI. A normal "cool" tire pressure of 105 PSI was recommended by the Pete's Roadside Service when I purchased new tires. I observed on the tire pressure monitoring system that the tires will definitely increase pressure as you're driving. The warmer the temperature outside the more the tire pressure increases as you're driving on a hot road.

I'm now setting my Toyos to 100 PSI here in Colorado when it's cool outside as in below 70 degrees. This setting is "MY" new preference after observing what the pressure does while driving. I'm sure some more experienced owners will offer their advice &/or experiences.

Bob Bowers (Surprise, AZ)
2003 Alpine Coach 40' FDTS
2014 Jeep Cherokee Lattitude
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Old 10-25-2010, 11:49 PM   #3
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Bob, it is very important that you know the weight on each tire, or at least each axle, before you run anything but the recommended psi on your coach, or max PSI of the tire. When you know your corner weights then you can lower the PSI in your tires safely. Check out this link Tire Information Links

My best guess is that 100 PSI is too low on your 40 footer, marginal at best. My front axle weighs 10,200 and I run 95 PSI. Giving me approximately a 800-900lb safety margin on 295/75R22.5. If you have 11R22.5, 100 psi will scale 11,900, and I believe your front axle is 12K
Tom, Patty, Hannah "The Big Dog" and Abby Kat, Indianapolis, Indiana 2000 36' FDS 72232 Our Photos
We live out in our old van. Travel all across this land. Drive until the city lights dissolve into a country sky, me and you - hand in hand.
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Old 10-26-2010, 10:51 AM   #4
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The tire pressure rating is printed on the tire.... WRONG

Go out to your tire and read THE ENTIRE SENTENCE printed there, Not just the last 4 words (Max Pressure yyy PSI) but the entire sentence

Maximum load of xxxx pounds at maximum pressure of yyy psi.

Thus, unless you are running maximum load.. That is NOT the proper pressure.

The pressure written on a tag somewhere inside is likewise all but guaranteed to be wrong (less the rig is empty save for the driver)

The correct pressure is found by weighing the rig and visiting RV Safety, Merritt Island, Florida or the tire maker's web site.

NOTE: the url above.. Has folks who will come out and weigh you for a fee.
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