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Old 01-07-2014, 03:42 PM   #1
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WOW-Check your tire pressures!

This cold weather definitely took its toll on the tire pressures.

I was out in the coach last weekend doing a maintenance run (engine, generator, slides, etc) and checked the tpms.

All 6 tires are down about 5-6 lbs each, which translates to around 6-7% pressure loss.

They were down a lb or two a couple weeks ago, but not 5-6 lbs.

I'm not going anywhere anytime soon, but I was still shocked to see that much lower cold temp pressure.

That was Saturday afternoon before the -15 degree temps flew in here (the Polar Vortex ) Sunday.

I'm sure they are even lower now......but I don't plan to inflate them back to normal until I drive again anywhere, maybe not a good idea?

Should I go ahead and pressure them back up or wait till warmer temps?

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Old 01-07-2014, 03:50 PM   #2
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I went from Florida to Georgia last week and i have tpms and noticed going from 80 degree temp to 40 degree temp the pressure had dropped a good 5 to 6 lb also " in morning before driving " once I started driving the pressure went up with in 5 minutes .
so when the cold weather make's you loose air pressure do you add air or just run the coach for a few for the heat to build up to increase air pressure ?

I would not think truck driver's going from state to state in different temp, air fill and unfill there tire's every day ?

whats your thought


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Old 01-07-2014, 04:00 PM   #3
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I personally would not try to "chase" the tire pressures while parked. If you have a tire that is severely lower and mis-shapen, air it up of course. Then when you get ready to roll, get the pressure to the correct amount with tires cold.

Lincoln Boy you get a gold star for even checking tire pressure when outside temps are cold. Remember not to put your tongue against an extremely cold tire gauge as it can stick there and you have to go to the ER to have it removed.
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Old 01-07-2014, 04:09 PM   #4
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What is the recommended pressure from the manufacturer of the tires for the weight that you have on each tire? Let's say for example that the Mfg recommended 90 psi and you inflated to 100 psi for any additional weight you may add in your travels. A 5-6 pound drop would still be within the specifications of the Mfg. Remember that for every 10 degrees of temperature change there will be a 2% increase/decrease in pressure. If you were at 70 degrees and dropped to 30 degrees overnight that would be about 8%, however it is more logarithmic in that for the first 10 degrees it would drop from 100psi to 98 psi, then from 98 psi at 2% and 10 more degrees it would drop to 96.4, and another 10 degrees from 96.4 would be 94.5 approximately. So even at a 40 degree drop over time you would still be within specifications.

You could even drive with those pressures being within Mfg specs. However, if you should want to you could inflate them back up to your inflation and just remember the next time it gets warm and you want to travel to check them again and adjust accordingly.

Personally I don't like inflating and deflating every time I want to move, so I use the fudge factor of 5 to 10 pounds over the Mfg's specs. I don't have to worry about it.

I check my tire pressures before we ever move from a site.
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Old 01-07-2014, 04:28 PM   #5
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Here's a chart that shows how pressure changes with temperature. If you like to keep your tire pressure at a specific level, you'd have to calculate the equivalent if the temperature is above or below the base (this chart uses 65 degrees).
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Old 01-07-2014, 08:59 PM   #6
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Why would you run the engine if your not going to use the coach? all you are doing is creating moisture from the heat then letting it sweat and freeze and a bazillion other things that will cause problems.
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Old 01-07-2014, 10:15 PM   #7
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I noticed my front truck tires are bulging more. Gotta check and air them up tomorrow.
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Old 01-08-2014, 12:39 AM   #8
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So I'm reading this thread

And I'm thinking to myself why not use nitrogen instead of air? So I do a search on the net and come across this article by "Tire Rack" one of the largest seller of tires and was surprised at their report on this cure all toted by a lot of tire shops. Note what they say half way thru the report about ambiant temperature change and nitrogen.

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Old 01-08-2014, 01:01 AM   #9
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I have over 5million miles in a big rig, no we don't deflate and reflate the tires with temperature change! Nor do you change the tire pressure from sea level to mountain passes. It all works out by itself. Never drove a truck with tpms or knew any others that had it. I'm sure some have it now.
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Old 01-08-2014, 07:43 AM   #10
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Rule of thumb has always been that a 5* F drop in temperature (from the temperature the tire was filled at) will cause a 1 lb. drop in tire pressure. The opposite is that for every 5*F increase in temperature (from the temperature the tire was filled at) will increase the tire pressure 1 lb.

It looks like SeeTheUSA's chart confirms it.
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Old 01-08-2014, 08:09 AM   #11
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I think it is best to consult with the experts, which are the tire manufacturers of a specific brand, but I do have my personal opinion.

In the meantime, here is a link to Roger Marble's RV Tire Safety blog. There is a lot of good information in his links regarding proper tire inflation.

Roger is a retired Engineer that worked in the tire business for many years.

Happy trails.

Roger uses TIREMAN9 on this forum and he will answer questions for you.

Kent, in regards to you original question, my personal feelings are that if your inflation after loosing the 5-6 pounds is still at a setting that will support the load per the tire manufacturer's recommendation then you do not need to add air. Engineers state that if a tire is 20% or more low on air than it is "running flat" and should be inspected. I'm not sure how that would equate to standing still but I'm betting it would have some effect on the tire. If adding 5-6 pounds to bring it back up to where it was gives you piece of mind, go for it.
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Old 01-08-2014, 08:22 AM   #12
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When I was younger I drove semis for my Father for about eight years. Early in the AM we checked the oil and fired the engine. Then we thumped the tires with a hammer while the engine warmed up. Then we hit the road.

In other words we did not check tire pressure! In eight years I never had a problem.

Now I have the TPMS 507SG and I can monitor my tires anytime I want. I think we have become anal about tire pressure. Our coach now has nitrogen filled tires. It was not my doing but has been explained to me that nitrogen molecules are larger than air and therefore do not leak out as quickly. Ho hum.

Yes, the cold lowers your tire pressure. Here in Minnesota it is very apparent. I only air up a tire if it is out of balance with the others. Otherwise the pressure will come up as the tire warms up from use.

Te each his own.
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Old 01-08-2014, 08:34 AM   #13
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A 78% Nitrogen mix works well for most of us.
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Old 01-08-2014, 08:41 AM   #14
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COMMON SENSE What ever happened to it?????? Long before TPMS became available nobody tried to chase tire pressures as they drove from cold to hot climates. The problem we seem to have is this. We have more information available and now we want to correct something that does not need corrected.

Sorry to react this way but please use some common sense. I'm not saying be careless or oblivious to TP changes just be reasonable.

Just yesterday this story ran in our local paper. It seems that the 6 road graders that they use for plowing the roads here in AR wouldn't start because of the gelled diesel fuel. DAH !!!! It is beyond me and the DW that these individuals didn't know about diesel fuel and cold, or they just didn't do anything about it. COMMON SENSE again isn't part of the gene pool these days.

Cooperhawk I just read your post (#12) X2.


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