Tire Pressure Question - Fiberglass RV


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Old 11-17-2015, 10:22 AM   #1
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Tire Pressure Question

We have a new SCAMP 13 footer, which we picked up from Backus on June 8th. Since we drove it home to Kentucky it has mostly been in the yard, except for a weekend camping trip nearby.
We are about to head out to Florida on Friday afternoon for 10 days of sun and fun. I checked the tire pressure and found every tire to be low! I had a 38 lbs and a 39 lbs and the spare was 42 lbs. The temps were in the mid 50's and was sitting in the driveway. The sticker on the camper said to inflate to 50 lbs.
I found it odd that all 3 tires were low. Making me think they were not 50 lbs from Backus.
What do all you folks inflate to? (in particular the 13 ft. scamp)
Should I inflate to 50 lbs as indicated?
Today the temperature is in the mid 50's again possibly approaching the low 60's.
Thanks...
Ralph
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Old 11-17-2015, 10:41 AM   #2
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Trailer tires should be set at "side wall pressure". In your case 50psi. That cold temperature measured in the morning before any driving.
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Old 11-17-2015, 10:42 AM   #3
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Inflate them to 50 pounds and check them periodically when cold(ambient temperature) to maintain them at 50 pounds.
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Old 11-17-2015, 10:58 AM   #4
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We inflate to a 50 PSI cold pressure on our Goodyear Marathons, suggested max. pressure. As we drive south from NH to FL the cold pressure increases so we check it regularly.
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Old 11-17-2015, 11:03 AM   #5
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...inflate to recommended sidewall pressure.
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Old 11-17-2015, 12:01 PM   #6
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Originally Posted by honda03842 View Post
We inflate to a 50 PSI cold pressure on our Goodyear Marathons, suggested max. pressure. As we drive south from NH to FL the cold pressure increases so we check it regularly.
And can I assume you do the same thing when driving north and add air as needed?
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Old 11-17-2015, 12:07 PM   #7
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I found that after a trip, my tires lose a few pounds of air. I inflate them to 50 psi before every trip.
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Old 11-17-2015, 12:23 PM   #8
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The temp and elevation both make a difference since gauge pressure is referenced to ambient pressure.
Also I believe that the Goodyear Marathon tires are rated to a higher speed inflated to 55 psi.


Sent from my SCH-I605 using Fiberglass RV mobile app
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Old 11-17-2015, 12:30 PM   #9
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Thanks guys... you are a big help! I will watch them as we go south and then coming back up north as well.
Ralph
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Old 11-17-2015, 12:51 PM   #10
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Quote:
Originally Posted by redbarron55 View Post
The temp and elevation both make a difference since gauge pressure is referenced to ambient pressure.
Also I believe that the Goodyear Marathon tires are rated to a higher speed inflated to 55 psi.


Sent from my SCH-I605 using Fiberglass RV mobile app
This is the first time I've heard of that. How does the tire gauge or any pressure gauge work referencing ambient pressure? Is there some sort of external sensor?
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Old 11-17-2015, 03:21 PM   #11
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After quick search I see there are temperature compensating pressure gauges. Prices are pretty high.
I've seen NASCAR use such thing, but no tire shop I've been in does.
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Old 11-17-2015, 03:46 PM   #12
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And can I assume you do the same thing when driving north and add air as needed?
Yes Bill. I do pay attention to our trailer tires. We have not had a problem.

I know that there is apparently information that if you inflate above 50 PSI you can drive at higher speeds. I do not do this and never drive over 65 mph, the max speed limit stamped on the tires.

As well we tend to drive early n the day to avoid the heat of the day for the tires.
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Old 11-18-2015, 11:00 AM   #13
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All good advice so I won't say more except regarding the changing pressure - perfectly normal as the outside ambient temp changes, especially with the seasons. You will want to check your pressure again once you're down south. You should also verify your pressure gauge, perhaps compare it with a mechanic's. I had one of the new, "digital" ones which I assumed was more accurate than my old mechanical one. Turns out it was reading five pounds light!
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Old 11-18-2015, 11:27 AM   #14
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Any tire filled with air will lose a little pressure over time especially as the temperature drops. Not sure if any of you are aware of it but tires filled with pure nitrogen will maintain their pressure better than tires filled with air. I believe the nitrogen molecules are larger than air molecules so their is less chance of them bleeding out of the tire. Of course this is all a moot point if you can't find nitrogen to fill your tires. If I'm not mistaken when you buy tires at Costco they do fill them with nitrogen but other than that I don't know where you would get it. I do know that you should check tire pressure when the tires are cold.
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