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Old 01-03-2013, 09:33 PM   #1
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Tire Pressure In Cold Temps

When I parked the MH in mid Nov all the tires were at 100psi. Now they are reading 86 to 88psi. Our temps are running low teens at night to 30 during the day. We are heading South Sunday and I'm wondering if I should air them up to my running psi of 100 or not. I know the weather temps have an impact on psi but how much??

Any thoughts out there? Should I air them up to 100 and hit the road and may have a lot more psi after they warm up or just go and watch to see if they hit 100?
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Old 01-03-2013, 10:00 PM   #2
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I would air-up to 100psi and adjust as needed each day.

fred
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Old 01-03-2013, 10:03 PM   #3
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If they 100 cold a few hours after you arrived they should be okay. Pressure flexes with temp.
Don't sweat the small stuff.
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Old 01-03-2013, 10:05 PM   #4
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I keep all my 6 tires at 90 pounds as per the Michelin tire chart.

A couple days ago, before we left on the trip we are on now, they had dropped to about 86lb with an outdoor temp around 40 degrees. I pumped them all up and when July comes around when it's 105 here I will have to drop them down to 90lb.

I set the pressure at home and don't change while I'm on a trip, even going around the entire United States. I'm at 300 feet and can see a few pounds difference at higher altitudes but I leave them alone as long as they are all about the same.
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Old 01-04-2013, 05:13 PM   #5
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I have pulled out when it was -22 F, the tires were all down about 15 pounds. I put 10 in and headed out. By the time the the temperature got into the low 60s I let it back out again.

Over inflation is less of an issue than under, but with the exception of very low temperatures, your tires will warm up as you drive from the friction of flexing, so you will regain some of the pressure lost to low temp once you hit highway speed. Drive it for 30 minutes, get out and check.
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Old 01-04-2013, 05:55 PM   #6
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Air them up and go. Next morning, readjust to 100 again...
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Old 01-04-2013, 07:46 PM   #7
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your tires will warm up as you drive from the friction of flexing, so you will regain some of the pressure lost to low temp once you hit highway speed. Drive it for 30 minutes, get out and check.

Yep. This is why under-inflation is the number 1 cause of tire failure. The side wall flexing and tread squirm from under inflation creates hot zones in the tire carcass where portions of the tire are severely over heated. Not a good thing. Counting on these hot zones to heat the air in the tire to reach a proper inflation pressure is pure folly.

Also, do not check tires after driving 30 minutes, cold inflation pressure recommendations are exactly that - cold tires.
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Old 01-04-2013, 08:00 PM   #8
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Tomorrow we will be around 28 degrees at 1400, I'll check them and bring them up to 100. With my TPMS, I'll be able to monitor them as I drive.
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Old 01-04-2013, 08:15 PM   #9
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[QUOTE=distaff;1420046]I have pulled out when it was -22 F, the tires were all down about 15 pounds. I put 10 in and headed out. By the time the the temperature got into the low 60s I let it back out again.

QUOTE]


distaff - I re-read your post and feel like I came across a bit harsh. If your tires were down ~15psi and you managed to regain 10psi in those conditions, then kudos to you. As you said, over inflation is less of a worry (with regard to tire integrity, maybe not to comfort) but I wouldn't advocate adjusting pressures after driving for 30 minutes.
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Old 01-04-2013, 08:21 PM   #10
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Yep...bring them up to 100 psi before you go. Assuming your tires have a max 120 PSI cold temp rating, you won't get into any problems even if you were to quickly get into some seriously warm temps by the end of the day.

Remember, what ever your tire says it the max cold temp PSI, that means that if you were at that max at start, you will go higher as the tire warms up on the road and within tire parameters. It is suppose to work that way too.
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Old 01-04-2013, 09:08 PM   #11
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...Drive it for 30 minutes, get out and check...

My manual says to check prior to driving.
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Old 01-04-2013, 09:14 PM   #12
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This conversation is exactly why I wish the tire or motorhome mfr's... just ONE of them-- would publish what they consider acceptable air pressure for a "running" tire. Or at the least, some kind of "adjustment" figure for very low ambient temps. Because-- does anyone know what the amount of temperature rise a typical tire develops at different ambient temps? I'm guessing here, but I'm thinking my 22.5's on my 12 ton motorhome probably get to around 140 on a 90 day, a 50 rise. But it's like 5 outside right now, and I'm pretty sure after a few miles they're going to be MUCH warmer than 55, but how much? If I put in 100 psi at 5, will the temperature rise actually result in too much pressure after driving awhile?
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Old 01-04-2013, 09:18 PM   #13
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Air them up and go. Next morning, readjust to 100 again...
Exactly. Do NOT adjust during the day. No way. Adjust the next morning on cold tires. NEVER adjust on hot tires. NEVER. Any advice to the contrary is bad advice.

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Old 01-04-2013, 09:28 PM   #14
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Per any tire manufacturer's tire inflation chart, the tire should also be inflated based on the axle weight, which obviously varies from coach to coach. So there is no single "right" inflation for everyone.
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