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03-23-2021, 02:38 PM
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#1
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Senior Member
Ford Super Duty Owner Georgie Boy Owners Club
Join Date: Nov 2018
Location: Lexington, SC
Posts: 252
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Tire pressure change while driving
I just recently installed a TPMS system on my MH. It is very accurate checking against 3 tire gauges I use. I run 85 PSI front and rear and have a Crossfire pressure Equalizer on rear Duallys to keep pressure the same in both tires.
I noticed that after driving my pressure increases to 92 front and 94 rear. I have stopped and confirmed the reading with a manual gauge. Is this normal to have this much increase in 30 miles driving with ambient temps of 70 degrees?
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2004 Georgie Boy Pursuit 35' Gas F53
Sumo Springs, Roadmaster Stablizer, CHF
Just two old Retired farts and their dog
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03-23-2021, 02:51 PM
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#2
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Senior Member
Join Date: Oct 2018
Location: Glendora, CA
Posts: 1,343
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ABSOLUTELY NORMAL!!
Two other factors it will greatly affect your pressures are altitude and ambient temperature.
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Steve & Janice
2015 Newell 2020P
2017 Ford F-150 Raptor TOAD with RoadMaster Nighthawk & AirForce1 Braking
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03-23-2021, 02:59 PM
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#3
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Senior Member
Newmar Owners Club Fleetwood Owners Club
Join Date: Jul 2013
Location: DFW
Posts: 1,473
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I would actually expect it to increase more in hotter weather.
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2009 Fleetwood Excursion 40E
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03-23-2021, 03:00 PM
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#4
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Senior Member
Join Date: Oct 2014
Posts: 7,870
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Quote:
Originally Posted by CaptainGizmo
ABSOLUTELY NORMAL!!
Two other factors it will greatly affect your pressures are altitude and ambient temperature.
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Indeed, temperature has a significant effect on pressure-- increase can be from change in ambient temperature, sun shining on them or from tire heating up due to internal friction as you drive.
Altitude-- not so much.
The Ideal Gas Law has been known for quite a while know (PV=nRT).
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Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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03-23-2021, 03:00 PM
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#5
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jun 2013
Location: 5 miles south of Lakeville, Mn
Posts: 3,046
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It's going to change a lot more than that.
I always check my pressures from the drivers seat with my morning coffee and adjust tires if need be. Then during the day the temps will rise with the heat of the day. I've seen them go up ten or more degrees. The tires on the sunny side will run warmer as well.
Also had one particular tire that always ran warm. Finally figured out why. It was just in back of the exhaust.
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Jim and Carol Cooper with Oreo the Kitty
FAA ATC ret, VFW, AL, VVA, NRA
US Army Aviation, MACV Vietnam 65-66
2012 Journey 36M, Cummings 360hp
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03-23-2021, 03:06 PM
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#6
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Senior Member
Join Date: May 2010
Location: Part-time out of Mesquite, TX
Posts: 1,103
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Quote:
Originally Posted by CaptainGizmo
ABSOLUTELY NORMAL!!
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In hot weather tire pressure will rise by 1 to 2# for every 10° of tire temperature increase.
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03-23-2021, 03:06 PM
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#7
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Senior Member
Join Date: Dec 2013
Location: Lake Havasu City, AZ & Plover, WI
Posts: 6,403
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A 15% increase in pressure is the accepted normal for a properly inflated tire for the load it is carrying. By mid afternoon, it can be more than that, but after correcting for the increase from a higher ambient temperature, I've often ended up with a 13-15% actual increase from rolling resistance.
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2006 Monaco Executive 44 Denali
2013 43 QGP Allegro Bus ( SOLD )
2013 Avalanche
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03-23-2021, 07:28 PM
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#8
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,655
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Were you concerned about tire pressure rise before you bought the TPMS? If not why be concerned now?
Tire and rim mfgrs, allow for this normal pressure increase, even if you have your tires inflated to the maximum. Most tire heat comes from sidewall flex and road friction, moisture in the compressed air increases the % of pressure rise.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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03-23-2021, 10:45 PM
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#9
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Senior Member
Newmar Owners Club Freightliner Owners Club
Join Date: May 2012
Location: Today? Clayton, North Carolina
Posts: 5,093
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Tire pressure change while driving
Quote:
Originally Posted by Cooperhawk
......
Also had one particular tire that always ran warm. Finally figured out why. It was just in back of the exhaust.
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LOL. When I first installed my TPMS nine years ago, I was perplexed that the right front tire on my toad was running so much warmer than any others. [emoji15]🤨
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John and Diane (RIP Lincoln, 21 FEB 22) RVM103 NHSO
Fulltimers since June, 2012
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element
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03-24-2021, 10:39 AM
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#10
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Senior Member
Join Date: Dec 2013
Location: Lake Havasu City, AZ & Plover, WI
Posts: 6,403
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FWIW. When our Allegro Bus was new, I noticed on our first long trip that the front right tire would run at a higher pressure and slightly higher temp than the left one. In the mornings, they were both the same. I thought it might be the sensors, but after changing and reprogramming them, the FR was still higher after a few hundred miles. I did a six position weigh at the FMCA show in Gillette, WY and found that the FR weighed 8100# (the tire was rated for 7840#) and the FL weighed 7150#. How could that be???? It was because the left rear ride height valve was set 1/4" out of it's accepted range which transferred weight to the opposite corner which was the FR steer tire. After adjusting the ride height into specs, both front tires were within 50# of each other and ran the same temps and pressures. So if you find that one tire seems to react differently than the others, there is usually a good reason why.
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2006 Monaco Executive 44 Denali
2013 43 QGP Allegro Bus ( SOLD )
2013 Avalanche
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03-25-2021, 08:28 AM
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#11
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Senior Member
Join Date: Mar 2014
Location: Campbellsville Ky
Posts: 509
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Quote:
Originally Posted by JFXG
LOL. When I first installed my TPMS nine years ago, I was perplexed that the right front tire on my toad was running so much warmer than any others. [emoji15]🤨
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I was the same way----the next trip it hit me
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2008 American Tradition 42C 2018 JUL Jeep Wrangler
2004 Newmar Dutch Star 4010 Spartan (Sold)
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03-25-2021, 08:32 AM
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#12
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Senior Member
Join Date: Jun 2019
Posts: 690
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It ain't pressure increase you need to worry so much about as pressure decrease, especially the rapid variety.
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'18 Rockwood 2109S '17 Silverado 2500HD WT. Hookups? What hookups? Mountains, please.
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03-25-2021, 08:53 AM
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#13
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Senior Member
Join Date: Feb 2020
Location: North Georgia Mountains
Posts: 588
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When we first installed our TPMS system I was also shocked at how much the tire pressure changed during the trip based on elevation; outside temperature, traveling speed and even road conditions (rough asphalt causing more friction and heat). Over time I became comfortable with determining a tire pressure range that I felt reflected normal driving conditions and set my TPMS tire pressure alarm to a level that was beyond any previous readings. I have found that if you insure that the tire pressure for your coach is set correctly, as confirmed through reading the pressure while the tires are at their coolest state, that the high pressure rarely becomes a concern because the tires are made to work within normal tire pressure fluctuations. The bigger concern is low tire pressure and substantially elevated tire temperatures. I have a much lower alarm setting around a decrease in tire pressure or an increase in temperature much more so than an elevated tire pressure since changes in those could indicate a slow air pressure leak, fast air pressure leak or a compromised tire wall indicative of a fast approaching tire blow-out situation.
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2007 Newmar Baystar; 3201; SumoSprings Front; Timbren Springs Rear; Safe-T-Plus; 2016 Fiat 500; Roadmaster Falcon 2;Demco SBS DUO Braking System;TST 507; Bilstein shocks; Garmin RV 785; Supersteer Rear Trac Bar, Thule Easyfold XT2,RVWhisper
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03-25-2021, 09:02 AM
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#14
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Senior Member
Join Date: Aug 2019
Location: A beach or race track near you.
Posts: 687
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As others have stated above, the increase is normal due to friction created rolling down the road. The engineers that build the tires factor this in when they set tire pressure limits and recommendations.
Not to be Captain Obvious, but if you ever see one tire with temp climbing more then the others that is a serious indicator that something bad is getting ready to happen and needs to be investigated.
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2001 Country Coach Intrigue "Chef's Getaway" #11199
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