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Old 11-21-2015, 08:48 PM   #15
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Bold, I remember that 10% advisory as well. I don't think he was considering changes in ambient temperatures as we are talking about, maybe starting the day at 25 degrees outside and 75 degrees the next day.

The 10% change advisory in stable ambient temps as a potential problem certainly sounds reasonable.
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Old 11-21-2015, 09:36 PM   #16
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Let's not forget about elevation change. I mean why not just trash our entire Saturday night taking about trailer tires.

So when I left Boston, my tires were where they needed to be, but 9000' higher on the Big Horns....
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Old 11-21-2015, 09:37 PM   #17
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Here is Tireman9's blog. His recommendation is fill it to the sidewall spec.
RV Tire Safety: "Interply Shear" and other Techno Babble

By the way, CapriRacer, another tire engineer, who posts here from time to time gives the same advice.

Here is a very good thread where both these gents weighed in on Cold Inflation Pressure (CIP). Thread was started by Tireman9 and CapriRacer also pipes in with a very good point.
http://www.airforums.com/forums/f438...re-140122.html
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Old 11-21-2015, 10:02 PM   #18
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I like to consider the tire engineers input into these discussions, and safety is paramount, but I don't think they are as concerned about a stiff ride roughing up my Airstream as I am.

So I've taken that and other Airstreamers' experience as all good advice and decided on 65-70 psi as something we can use, still thinking of a little less.
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Old 11-21-2015, 10:17 PM   #19
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Run At Max Sidewall Pressure!

For the best tire life, mileage, wear and over all performance, you should always run the max pressure listed on the sidewall. Tires that are underinflated run at hotter temps than tires that are inflated to max pressures. Many tires that blow out have usually been underinflated at some time in their life. Yes, you may notice a slight degradation in the ride, however you will have less sway and a better overall experience with your tire. For the best overall tire performance have nitrogen installed at max pressure. LT tires can even be inflated 10% over the sidewall max pressure per manufacturer specs for heavy hauling. I have never done so, because I never overload a tire, and I have never had any trouble.
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Old 11-22-2015, 10:48 AM   #20
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Question

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Originally Posted by TheDuke View Post
For the best tire life, mileage, wear and over all performance, you should always run the max pressure listed on the sidewall. Tires that are underinflated run at hotter temps than tires that are inflated to max pressures. Many tires that blow out have usually been underinflated at some time in their life. Yes, you may notice a slight degradation in the ride, however you will have less sway and a better overall experience with your tire. For the best overall tire performance have nitrogen installed at max pressure. LT tires can even be inflated 10% over the sidewall max pressure per manufacturer specs for heavy hauling. I have never done so, because I never overload a tire, and I have never had any trouble.
If this is true, why then are manufacturers putting vehicles on lots with under inflated tires?

There seems to be no consensus or standard.
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Old 11-22-2015, 10:50 AM   #21
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Lost me at the Nitrogen.
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Old 11-22-2015, 11:22 AM   #22
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theoretically they stay cooler with nitrogen...
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Old 11-22-2015, 11:48 AM   #23
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Quote:
Originally Posted by TheDuke View Post
For the best tire life, mileage, wear and over all performance, you should always run the max pressure listed on the sidewall. Tires that are underinflated run at hotter temps than tires that are inflated to max pressures. Many tires that blow out have usually been underinflated at some time in their life. Yes, you may notice a slight degradation in the ride, however you will have less sway and a better overall experience with your tire. For the best overall tire performance have nitrogen installed at max pressure. LT tires can even be inflated 10% over the sidewall max pressure per manufacturer specs for heavy hauling. I have never done so, because I never overload a tire, and I have never had any trouble.
Not wanting to troll this issue, but your source for this information, or your qualifications and/or certifications in the tire industry are…………..?
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Old 11-22-2015, 12:04 PM   #24
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I run mine at 80 as recommended by Colonial Airstream. 12,000 miles so far and no signs of wear at all... certainly not the heavy center tread wear I'd associate with over inflation. This is a thought provoking discussion.

As for ride, there was that time we set up to camp and found a dinner fork in the ceiling that had been left on the breakfast table.... hmmmmm.
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Old 11-22-2015, 12:15 PM   #25
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Please, not nitrogen again....
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Old 11-22-2015, 12:34 PM   #26
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Please, not nitrogen again....
I fill mine with compressed 'atmosphere'....then slowly let just the 21% that isn't N out.

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Old 11-22-2015, 02:39 PM   #27
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Alright, so I ran 80psi. Inflated this morning, we drove for 2 hours from Parker, AZ to Yuma, AZ next to the proving grounds. 110 miles. I checked the PSI 75 miles into the trip with about 50 mins left. PSI had reached 89 psi in all tires. Ambient air temp outside was 71, but I am driving through the desert.

I can't tell if it was smoother or not honestly.

But I know where it wasn't smoother and perhaps worse. Washboard road! We drove 5 miles of washboard here to our spot in Yuma. 80psi might be fine on smooth US interstate, but I don't know about regular roads in the desert and dirt/gravel roads. That's really harsh.



So another question for this thread. When off-roading, I use my Staun tire deflators and take the truck down to 20psi. Nice, smooth ride. I would think this technique would work on the Airstream as well, since we are not on pavement, and traveling at very low speeds. Thoughts?

Probably wouldn't take the Airstream that low, but I might take it down to 35 or 40psi. Generally you want the tire to kind of look flat when off roading so it rolls over rocks and stuff easier.
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Old 11-22-2015, 03:31 PM   #28
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If this is true, why then are manufacturers putting vehicles on lots with under inflated tires?

There seems to be no consensus or standard.
Manufacturers will list the recommended inflation pressure on door jam. You will find those PSIs, when checked against the tire inflation load chart, will match the tires to the axle max wt. My 2500 Chevy is fitted with "E" rated tires, yet door placard calls for front 60psi and rear 75psi. Those inflations bring the two tires equal to the axle certification on front and rear. Is called lawyer inflation pressure.

I run 75 to 80 psi on my ST Maxxis "15 inch E"s. I see no indication of rough ride to my 30 FC interior or exterior (and ST tires have a stiffer sidewall than the LTs that many now use). I would think for every pound you lower the pressure, the more safety margin lost. I also wonder how much air you have to let out to really get a ride smooth enough to matter. Sidewall pressure will give you the coolest running tire. Other than road hazards, or manufacturing defects, it's the heat build up that will park you on the side of the road.
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