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Old 07-22-2012, 04:44 PM   #1
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Tire pressure in this hot weather

Get ready to take a trip tomorrow so I checked my tire pressure today and they are at 100PSI. Micheln recommends 95 when they are cold. Do you suppose a person should let out a little air in the 100 degree weather?
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Old 07-22-2012, 05:03 PM   #2
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I had 6 new tires put on about a month ago. After I got my rig back to my home CG and installed my TST 507 TPMS I aired them up early one morning when it was "cool" to the pressures needed. I used 93 up front and 98 on the duals. I took note of what my TPMS reported compared to my tire gauge. All were pretty close.

As the temps got hotter I have seen my tire pressures all rise between 3 & 5 PSI. Of course, when I drive it they go a bit higher.

So, in giving you my opinion...NO. I would not lower tire pressure to compensate for high ambient temps.

You might need to be more concerned with this kind of issue if you were to move your rig from sea level to Denver (or back) or driving in to an area with a MAJOR difference in ambient temp. But, if you remain at the same relative elevation, I think you are just fine.
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Old 07-22-2012, 05:05 PM   #3
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Put 95 in and go.
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Old 07-22-2012, 05:15 PM   #4
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What was the outside temps when you checked them?
For every 10º in change up or down the PSI in the tires will change 2%.

If you checked at 100º and drove into 80º temps. PSI would be around 96.
Probebly not much chance of you getting into 115º. So just leave the 100 PSI in them.
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Old 07-22-2012, 05:34 PM   #5
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We just got back from a trip and before we headed out I went out early in the morning and set the front tires to 115 and the duals to 95. We got on the road and after driving for a few hours the front tires went up to and stayed around 128/129 and the rears 113/114 with a tire temperature range from 84* to 90*.

Check them at the coolest time of the day before you have driven anywhere and set your rig to what works best for comfort and load...
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Old 07-22-2012, 05:40 PM   #6
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Thanks for all the good info and looks like I'll just leave them where they are. It was close to 100 when I checked them and a little later it went to 107 in North Platte, NE. Just unreal heat we're having this summer. Pastures are gone, very little hay and a fire has burned a 100,000 acres close the Ne/SD border. We're headed for Minnesota so maybe we'll find a little relief.
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Old 07-22-2012, 05:42 PM   #7
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Quote:
Originally Posted by athuddriver View Post
I used 93 up front and 98 on the duals.
Very seldom do the rear tires require more pressure than the front.
What are your weights and tire make/size?
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Old 07-22-2012, 06:20 PM   #8
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Quote:
Originally Posted by Mr_D
Very seldom do the rear tires require more pressure than the front.
What are your weights and tire make/size?
Mine require 90 in rear and 75 up front. Had all four corners weighed and follow Michelin tire guide.
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Old 07-22-2012, 06:28 PM   #9
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Mine require 90 in rear and 75 up front. Had all four corners weighed and follow Michelin tire guide.
And, what are your weights and tire model and size? Again, it's very seldom that rear tires take more pressure than the fronts.

Even with oversize 305/70's on the front and standard 275/70's on the rear our rig takes 85 rear and 100 front. With 275/70's all the way around it was 120 front (actually 125 by the charts but the wheels would only take 120) and 85 on the rear.
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Old 07-22-2012, 06:37 PM   #10
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Quote:
Originally Posted by Mr_D
And, what are your weights and tire model and size? Again, it's very seldom that rear tires take more pressure than the fronts.

Even with oversize 305/70's on the front and standard 275/70's on the rear our rig takes 85 rear and 100 front. With 275/70's all the way around it was 120 front (actually 125 by the charts but the wheels would only take 120) and 85 on the rear.
See page #31. http://www.costco.com/Images/Content...1_RV_Guide.pdf .

I have the 235 80 r 22.5 xrv.My front axle is 3500 and the rear is 7300.
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Old 07-23-2012, 08:38 AM   #11
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Tire prssure'' Interesting subject;; When I worked, At the tire shop and listen to the different opions it will blow your mind. Everyone has a differt one.. some even 2; We have A diesel pusher. 275 x 80 x22.5 Mich; truck green lines on it . Run 100 lbs all around; That works for me..
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Old 07-23-2012, 10:15 AM   #12
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Originally Posted by Mr_D View Post
And, what are your weights and tire model and size? Again, it's very seldom that rear tires take more pressure than the fronts.

...
From my tire charts I don't think that is the norm for the way most rigs are set up by the owners. I could be wrong. Maybe the longer wheel base on a DP spreads things a bit better towards the front but with my gas rig I'm running into a problem to get weight that I am adding to be more towards the front. Keep in mind that I have moved as much of the heavy basement items such as air compressor, grill, LP tank and such as far forward as I can. I see it as being difficult to get enough weight on the front wheels to make me increase my current front tire pressures high enough to exceed my rear tire pressures. Also, any weight I do add will add some or most of it to the rear depending on where that weight is. I will probably max out my rear GAWR before I can max out my GVWR I could be wrong but...

In defense of your statement Per the Workhorse manual for my 235/80R 22.5 tires, if both axles for a 24,000 lb chassis are at GAWR then use 105 front and 95 rear the combined weight must not exceed GVWR. Yes, that supports what you have said but as I have already mentioned and from my limited experience, it appears more normal to have the rear axle closer to GAWR than the front.

Also, it seems that there is more of an imbalance in L to R weights on the rear wheels than on the front ones. In my last weighing I came out with:

Front - LS 3840, RS 3840 - Total 7680 - Chart Tire pressure about 87 PSI
Rear - LD 7520, RD 7600 - Total 15120 - Chart Tire Pressure about 92 PSI
NOTE-prior to that weight I did another with holding tanks about 1/2 full. That made the rear balance about 250 heavier on left side.

I have taken my rig to the CAT scales 4 times. In all cases the charts tell me to put about 87 PSI in the front and increased from 90 - 93 PSI in the rears as I have added more "stuff". (BTW, I generally add 5 PSI to those numbers.)

Anyone still awake after reading this?
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