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04-14-2015, 09:58 PM
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#1
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Senior Member
Newmar Owners Club Solo Rvers Club
Join Date: Feb 2014
Location: The Constitution State
Posts: 4,554
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Tire pressure built up over time sitting
I was preparing to travel tomorrow and in checking the tire pressures, I found they all went up It was in the morning when I was checking and the RV has been sitting for the last 5 months. Each tire was up around 120 psi, even the rears. I can assure everyone I have not filled them to that pressure in the past.
So I wound up lowering all the tires (110 psi in the fronts, 95 in the rears) based on my last weighing and am just curious, do tires increase in pressure like that over time (it's just south of Tampa).
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04-14-2015, 10:02 PM
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#2
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Not normally but if the temps were higher then yes it can happen but not usually that much.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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04-14-2015, 10:06 PM
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#3
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Senior Member
Join Date: Jul 2001
Location: Wallkill NWR, NJ
Posts: 184
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Maybe you need a new tire gauge.
__________________
'17' F350 6.7 CC King Ranch DRW 4x4 4:10s B&W 20 K Companion Hitch
'04' NuWa 33.5 RLTG DA Demco GlideRide pin box
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04-14-2015, 10:09 PM
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#4
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Senior Member
Tiffin Owners Club Workhorse Chassis Owner
Join Date: Oct 2009
Location: Warner Robins, GA
Posts: 2,613
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Quote:
Originally Posted by Stickdog
Maybe you need a new tire gauge.
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I was thinking the same thing.
Jon
__________________
Jon & Sue Francis (Retired U.S.A.F.)
Lil Girl-Rescued, Abby Rescued, Peaches Rescued
06 Allegro 35TSA Workhorse Chassis
2013 Chevy Spark Dinghy
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04-14-2015, 10:09 PM
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#5
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Senior Member
Join Date: May 2012
Location: Deep in the Heart of Texas
Posts: 476
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If you filled the tires on a cold day last fall, and checked them on a Warm spring morning they could read higher. Or it could be your tire gauge, Ive never seen one with a calibration sticker. I thought about that a lot during the NFL "Deflate gate" me being a former instrument calibration technician.
__________________
2000 DSDP, 3883,Freightliner,330 Cat, 07 Jeep Commander 4x4toad.
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04-14-2015, 10:12 PM
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#6
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Senior Member
Join Date: May 2012
Location: Deep in the Heart of Texas
Posts: 476
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Stickdog & jfran, you posted while I was still typing. LOL
__________________
2000 DSDP, 3883,Freightliner,330 Cat, 07 Jeep Commander 4x4toad.
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04-14-2015, 10:24 PM
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#7
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Senior Member
Newmar Owners Club Solo Rvers Club
Join Date: Feb 2014
Location: The Constitution State
Posts: 4,554
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Quote:
Originally Posted by jfran304
I was thinking the same thing.
Jon
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Being I don't trust gauges, I checked them with two different ones. Both read much higher (the other one was even higher than 120 but I know that one normally reads higher). And these are not $10 gauges but then again, they're not $100 ones either.
And I did fill them in colder weather and it's been very warm here lately (high 80's).
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04-15-2015, 02:02 AM
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#8
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Senior Member
Join Date: Oct 2012
Posts: 825
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I understand that all tires where about 120 psi, and where filled 95 and 110.
then even if inaccurate reading there should be a difference .
could it be that the place where you stored it was not your own garage, and the owner for service filled tires ? Or else somewhere along the way at a tank station they once filled the tires standard to pressure given on sidewall, a service they think that normal that they did not mention it?
Slight chance that you measured it when driven so hotter inside tire temp.
then still the rear tires ( 95 psi) should have to low pressure so heat up more then front ( 110 psi) , because front then had right pressure so heated up less , and end pressure the same rear and front, because inside tire temp was higher in rear then front.
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04-15-2015, 03:20 AM
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#9
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Senior Member
Vintage RV Owners Club Ford Super Duty Owner
Join Date: Jan 2015
Posts: 182
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80 degrees shouldn't cause a change like you're describing. Normally your tire pressure won't raise on its own until it's rolling down the hwy and building up heat.
__________________
'97 Pace Arrow Vision 36 with Tag Axel, Ford 460 with Banks Power Pack. 2000 Jeep Wrangler Toad, one miniature schnauzer that rules the roost and a wife that enjoys traveling. Retired FTCS (SS) USN and loving it. FMCA#461483
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04-15-2015, 09:05 PM
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#10
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Senior Member
Tiffin Owners Club Workhorse Chassis Owner
Join Date: Oct 2009
Location: Warner Robins, GA
Posts: 2,613
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Quote:
Originally Posted by bokobird
Being I don't trust gauges, I checked them with two different ones. Both read much higher (the other one was even higher than 120 but I know that one normally reads higher). And these are not $10 gauges but then again, they're not $100 ones either.
And I did fill them in colder weather and it's been very warm here lately (high 80's).
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Tire Rack has a lot of information about proper care of tires. Check this out for temperature fluctuations: http://www.tirerack.com/tires/tirete....jsp?techid=73
Another thing that might have an affect on your tire pressure is altitude. Check this out: http://www.tirerack.com/tires/tirete...jsp?techid=167
Jon
__________________
Jon & Sue Francis (Retired U.S.A.F.)
Lil Girl-Rescued, Abby Rescued, Peaches Rescued
06 Allegro 35TSA Workhorse Chassis
2013 Chevy Spark Dinghy
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04-15-2015, 09:18 PM
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#11
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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I bought a certified gauge at NAPA and only use it to verify the other gauges I own. I also have a Psiclops setup ( http://www.popularmechanics.com/cars/a1875/4219068/) that allows two tires to be filled simultaneously plus a SmarTire system on the CC now. I also have a TST system I had on the Dutch Star. To say I watch the tire pressures is an understatement!
My Psiclops is an older model though but still works just fine.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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04-15-2015, 09:37 PM
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#12
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Senior Member
Join Date: Sep 2012
Posts: 1,562
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sure pressure changes... my tire pressure can vary up to 2-5 psi for just having one side of the RV face the sun while the other side stays cold. Its physics, pressure is proportional to temp.
__________________
Ferdinand,
2014 Thor Palazzo 33.3 (Melody), Folkstone
2017 Jeep Rubicon, Ready Brute Elite & Currie Ent Baseplate
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04-16-2015, 09:02 AM
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#13
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,519
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The psi change information in that article is not valid for large RV tires - it is based on typical passenger pressures. A tire changes its pressure a bit less than 2% for every 10 degree change in temperature, so an RV tire at approximately 100 psi changes about 2 psi up or down with a 10 degree up or down temperature change.
If you left the tires at 95 psi and came back to find them at 120 psi, either somebody added air or the temperature changed by 120+ degrees. Or the gauge used was horribly inaccurate.
Tires left alone lose air pressure rather than gain it.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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04-16-2015, 10:28 AM
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#14
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Senior Member
Winnebago Owners Club
Join Date: Feb 2014
Posts: 961
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Heat varies PSI- get a decent gauge, so you can tell how much.
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