What tire pressure do your run?

[Tony H]

In Washington State there is another place to get weighed. Most of the state weigh stations are functional even when not in use and it is OK to use them. The digital display is easily visable from the outside on the one nearest to us and reads to the nearest 10 lbs.

I spoke to a state patrol officer a while back who told me they are certified regularly and that they are left on primarily for truckers to check their loads. Those not left working when unattended are a few locations where vandalism has been a problem.

Maybe other states do the same?

[BarryN514]

I went to Mayflower truck company. It cost me $10.00 and they are certified scales.

I can not find a weigh chart for the tire manufacture. They are Dynatrac S990.

[Steve N Sal]

I generally run 95 front and 90 rear according to our weight. Of course our tires are larger then the one the OP stated.

[56 Nomad]

I see all these numbers 75 80 85 110 psi but no one refrences their pressure to temperature. I just finished installing my TST tire pressure/temp monitering system this morning 7AM outside air temp was 68 degrees F. Inflated fronts to 84 psi correct for my wheel axle load. Now 4hours later MH has not moved 1 wheel in sun 88 psi 94 degrees F one in shade 85 psi 73 degrees F. So be sure when airing tires you have all at same temperature as it makes a big difference.

[Dunner]

In the summer, I have read over 165° on a sunny side tire and 110° on a shady side tire.
I asked before and didn't get an answer. What pressure do I set them to? I asked at Discount Tire and got the generic answer of "Set them cold".

[BarryN514]

I also went to discount tires for advise and they said I should be fine at 110 and he never asked about my weight or looked at any chart.

Can't seem to get a Streight answer from anyone. I know after the dealer put on the new tires and 110 psi, the coach road walked. Like steering a bull with a thread.

[FDchief]

After weighing coach and consulting Michelin chart;

92 psi fronts
82 psi rears

2 psi higher than chart for both front and read.

[krautkamper]

Not all tire manufacturers provide the loading chart. Dynatrac, made by Double Coin, owned by CMA, China Manufaturers Alliance is one of them. I found this out after extensive research and talking to the factory reps and engineer. They basically said this information is not provided for liability reasons and we, the users should just run the tires at stamped PSI (125 PSI in my case) to ensure that they will handle any load up to the rated value. To me this is silly since I am not at the rated weight, and I run 100 PSI and will try even lower this summer. The ride is rough at those pressures.

[jzick]

Can't seem to get a Streight answer from anyone

Here is a straight answer. Weigh each corner of the motorhome (axle weight at least if corners cannot be done) and set psi based on tire manufacturer's instructions for your specific tire. Our dealer four corner weighs our coach before recommending tire pressures but I still double check.

[BarryN514]

Originally Posted by FDchief

After weighing coach and consulting Michelin chart;

92 psi fronts
82 psi rears

2 psi higher than chart for both front and read.

Looking at Goodyear and a few other manufacture, there website says to have all tires the same PSI. just saying.

[krautkamper]

They mean inflate each tire on the same axle to the same PSI.
"Inflate all tires on that axle to this same inflation pressure"

[cbeierl]

Originally Posted by John Stott

I have a 2005 National Seabreeze 1341 that has 245/70/19.5 tires. The sticker on the doorway says to run 85 pounds air pressure in both front and back wheels. The rig is new to us but we find that it is very rough on the bumbs and wonder if running a little lower air pressure is ok (say about 80 pounds?). Please let me know what air pressure you run on yours. FYI the sticker also says the weight on the front axel is 8500 and the back axel 14,500 pounds, but I really dont know what different that makes.

Thanks in advance.
John

You don't indicate the brand of tire you have, but both the Michelin and GoodYear tire inflation charts show the same pressure for this size tire. Based on your 8,500 lbs Front GAWR and your 14,500 lbs Rear GAWR you should run 105 psi in the front tires and 90 psi in the rear. You may want to add a few pounds to those numbers to give yourself a little margin.

If you can get actual axle (or ideally individual wheel position) weights then you may be able to reduce the pressures (in consultation with the tire inflation charts) if your actual weight is less than the GAWR ratings.

[1ciderdog]

BarryN514
I believe it is supposed to read the same pressure for all tires on the same axle. Not all tires on the vehicle.
Safe Travels
Bob

[Ramblin]

So, to determine the pressure for a given axle, lets work through a hypothetical:

Say the DW's side of the MH is 500lbs heavier, for some reason than my side. Total steering axle weight is 15000 lbs. That's 7,250 on my side, and 7,750 on the DW's side. I would use the tire chart to figure the pressure to carry 7,750 (the higher of the two) and inflate BOTH to that pressure.

And if I were to just use the total axle weight one of the tires might be underinflated, which is BAD, but overinflation is not bad as long as it does not exceed the maxuimum pressure of the tire.

Do I have this right?