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04-10-2016, 10:35 AM
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#1
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Montana Fan
Join Date: Mar 2004
Location: Bristol
Posts: 396
M.O.C. #1269
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PSI Levels
So, now that my Tire Minder is up and running I have noticed something; in the morning, I set my G series Goodyear tires to 103 pounds thinking that they would rise up around the 110 maximum when I was on the road. Driving across Florida they went up to 116 PSI. I stopped at a rest stop and brought them all down to 110. I will see what they read in the morning. Meanwhile, I'm wondering if this is OK? Should tires that are rated to have a maximum PSI of 110 be OK up to almost 120 when they are running hot on the road?
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04-10-2016, 11:03 AM
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#2
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Montana Fan
Join Date: Oct 2010
Location: Maryville
Posts: 178
M.O.C. #10812
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Yes, the rating is cold psi, and the tires have reserve built into them to compensate for the psi raise due to heat. JT.
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04-10-2016, 11:18 AM
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#3
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Montana Master
Join Date: Feb 2004
Location: Brandon
Posts: 3,944
M.O.C. #1034
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We run ours at 100 psi cold and there is no need to worry if the psi increases by the amounts you indicate.
__________________
Darwin & Maureen DeBackere
Minnedosa, Manitoba, Canada
2011/3500/Silverado/4x4/DRW/Duramax
2017/3721RL/Legacy Pkg./Pressure-Pro
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04-10-2016, 04:14 PM
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#4
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Montana Master
Join Date: Mar 2015
Location: West Richland
Posts: 1,253
M.O.C. #17164
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I would tend to agree with Trustymopars as everything I have read and heard was always rated for cold PSI.
Tom Marty
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04-10-2016, 04:20 PM
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#5
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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We run ours at 108-110psi and have seen them go as high as 126psi on the sunny side of the rig in 100 degrees plus. After 5 years and 45,000 miles they still look like new.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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04-10-2016, 04:30 PM
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#6
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Agree, cold PSI
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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04-11-2016, 05:44 AM
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#7
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,148
M.O.C. #1920
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As others have stated, cold PSI. As we add new devices, sometimes we have to think about what our devices are telling us. A number of factors affect tire pressure and temps as we ride down the road. And temp impacts pressure. Go to the load chart and set the pressure to the weight you are carrying (cold). You will notice heavily loaded areas of the trailer may increase more, crown on the road can increase friction and cause one side to increase more and as mentioned sun can also increase pressure. The best advice is get them aired to the proper pressure cold, set your alarms and react if it alarms or you see significant changes. For example, our first trip with tire monitoring, we had our under temp set to 70 and our over at 120. All of the tires were running toward the 120. Suddenly, one tire started to drop. I pulled over at the next pull off and had a slit in the sidewall. Safe travels.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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04-11-2016, 05:55 AM
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#8
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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Set the PSI cold. We also noted on our TST system and also when we had the pressure pro system that there was a difference between the PSI setting at the monitor and the psi setting at the valve stem. The PSI setting at the TST monitor in the truck is 3PSI lower than the valve stem setting. We set the PSI at 110 at the valve stem. We also have 3 so called high quality Digital air gauges and none of then read exactly the same. The PSI readings that DQDICK post are not at all uncommon.
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04-11-2016, 08:51 AM
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#9
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Montana Master
Join Date: Jun 2010
Location: Colorado Springs
Posts: 3,335
M.O.C. #10496
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Absolutely correct!
Quote:
quote:Originally posted by trustymopars
Yes, the rating is cold psi, and the tires have reserve built into them to compensate for the psi raise due to heat. JT.
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__________________
2010 3150RL
LevelUp, Dual 6 volt batteries, Progressive Industries EMS HW50C, Honda EU2000i Generator, Bridgestone Duravis R250 tires, Torklift Glowstep Revolution Stairs, LED Tail lights
2015 RAM 3500 Laramie SRW LB CC Cummins 6.7L Aisin Trans B&W RVK3600
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04-11-2016, 10:37 AM
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#10
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Montana Master
Join Date: Nov 2007
Location: Kville
Posts: 2,865
M.O.C. #7871
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Sometimes we tend to over think some of these issues. There is a tire guru on another forum, he says set the PSI in the AM before you start driving. Don't change it until the next morning, if necessary. Two things will affect the tire pressure (not including heating up when driving)...altitude change and/or outside air temperature.
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04-13-2016, 07:14 PM
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#11
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Montana Master
Join Date: Oct 2013
Location: Ogden
Posts: 638
M.O.C. #13862
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Never let air out of a tire because the pressure is up after running it. Check and adjust pressures ONLY when tires are cold (By cold I mean having not been driven on.) Cold can be any ambient temperature at all. It doesn't matter if it's -18 degrees in Wyoming in Jan., or 118 in Phoenix in July, you check and adjust tires only after they have sat overnight.
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04-14-2016, 03:06 AM
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#12
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Established Member
Join Date: Feb 2016
Location: Prescott Valley
Posts: 37
M.O.C. #18289
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How does elevation affect pressure? I live at 5000 feet but my Montana is in Quartzsite Arizona at about 1000 feet or so but will be towing it from Quartzsite to home in a couple of weeks. Any thoughts?
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04-14-2016, 05:40 AM
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#13
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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Never did any adjustment for altitude.
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04-14-2016, 06:04 AM
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#14
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,552
M.O.C. #2283
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I've been keeping an eye on the pressure in my tires while my camper just sets. The sun can't get to the tires and yet the pressure will vary 4 pounds from a 40 degree morning to a 70 degree afternoon. My tires are set at about 80 pounds. With that much variation who is to say what they are set at.
Lynwood
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04-14-2016, 07:54 AM
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#15
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Montana Master
Join Date: Feb 2005
Location: Haysville
Posts: 4,261
M.O.C. #3085
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"How does elevation affect pressure?" As altitude increases ... atmospheric pressure decreases. So a tire aired up to a given psi at say sea level will read a higher pressure at say 5000 ft. The same issue with air beds traveling in the mountains come to play here. For tires ... it is a minimal psi change with no cause for concern. On the same note it is generally accepted that for each 10 degree increase in temp, tire pressure increases about 1 psi
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04-14-2016, 07:57 AM
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#16
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Established Member
Join Date: Feb 2016
Location: Prescott Valley
Posts: 37
M.O.C. #18289
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Thanks diesel guy. I was just wondering. When you buy a bag of potato chips here, it looks like someone pumped air into the bag due to elevation #128513;
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04-15-2016, 08:34 AM
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#17
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,148
M.O.C. #1920
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And at 7500 feet, ice cream pops the lid off.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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