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Old 03-22-2011, 12:12 PM   #1
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Tire Pressure 235/80R/22.5 ?

Can anyone give my the best air pressure for my XRV Tires? I know the tire calls for 110psi but does anyone run them lower?
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Old 03-22-2011, 02:42 PM   #2
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Can anyone give my the best air pressure for my XRV Tires? I know the tire calls for 110psi but does anyone run them lower?
You need to have your MH weighed , preferably all four corners separately but each axle will work for now if you can't do the other way. Then look at the Michelin chart and air up accordingly. I have the same tires and use 80 on the front ( it calls for 75 ) and 90 in the rear ( it calls for 85). The extra 5 lbs are for good measure in case I lose a little along the way.

Here is a link to the chart you need to check after you weigh your rig. http://www.michelintruck.com/micheli...adAndInflation

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Old 03-22-2011, 03:03 PM   #3
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Can anyone give my the best air pressure for my XRV Tires? I know the tire calls for 110psi but does anyone run them lower?
The 110 is maximum cold pressure. I run 90 in mine based on actual weights and Michelin tire inflation charts.
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Old 03-22-2011, 03:25 PM   #4
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Can anyone give my the best air pressure for my XRV Tires? I know the tire calls for 110psi but does anyone run them lower?
That question can only be properly answered after you weigh your coach as cliftall says.

Based on our coach weight, I run 100 psi in the fronts and 105 in the rears. We have a W24 on the same size tires, so I need to run our pressures higher than those with a W22 because our W24 can (and does) carry more weight than a W22. We're full-timers, and we're loaded near the max.
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Old 04-24-2011, 12:41 AM   #5
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Correct tire pressure

I worked for Michelin and Yokohama Tire corporation for 15 years or so. I say that so that what I say next will have some credibility. The correct tire pressure is based upon the size of the tire, the load it is to carry at a given speed, at a given temperature. Tires are put together with heat and pressure and they will come apart the same way.
The pressure listed on the sidewall of the tire is the maximum pressure for the tire's maximum load based upon highway speed as measured before running (cold). A tire running across Michigan in the winter is under considerably less stress than the same tire running across the desert in the summer.
The manufacturer inflation guides are the minimum pressures to be run for the weights listed. To be sure you have enough air pressure, check the pressure before starting out. Then stop when you have been running at speed for at least 15 to 30 minutes. Immediately check the pressure. If it was 90 when you started and is no more than 99 when you stop, you are running enough air. A 10% pressure build up due to heat is appropriate. If it is more than 10% you need to add air. This will allow the tire to run cooler and actually lower the operating air pressure when you check later.
If the tire does not build up any pressure after running it, you can safely lower the air pressure and allow the tire to perform better and last longer. However, it is always better to error on the high side.
One more plus using this system to check for proper pressures is that even if your air gauge is not calibrated properly the 10% rule still works.
See ya down the road.
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Old 04-24-2011, 01:06 AM   #6
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Originally Posted by AccessMaster View Post
I worked for Michelin and Yokohama Tire corporation for 15 years or so. I say that so that what I say next will have some credibility. The correct tire pressure is based upon the size of the tire, the load it is to carry at a given speed, at a given temperature. Tires are put together with heat and pressure and they will come apart the same way.
The pressure listed on the sidewall of the tire is the maximum pressure for the tire's maximum load based upon highway speed as measured before running (cold). A tire running across Michigan in the winter is under considerably less stress than the same tire running across the desert in the summer.
The manufacturer inflation guides are the minimum pressures to be run for the weights listed. To be sure you have enough air pressure, check the pressure before starting out. Then stop when you have been running at speed for at least 15 to 30 minutes. Immediately check the pressure. If it was 90 when you started and is no more than 99 when you stop, you are running enough air. A 10% pressure build up due to heat is appropriate. If it is more than 10% you need to add air. This will allow the tire to run cooler and actually lower the operating air pressure when you check later.
If the tire does not build up any pressure after running it, you can safely lower the air pressure and allow the tire to perform better and last longer. However, it is always better to error on the high side.
One more plus using this system to check for proper pressures is that even if your air gauge is not calibrated properly the 10% rule still works.
See ya down the road.
Thanks for this information. Next trip out I will see what mine do.
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Old 04-24-2011, 09:04 AM   #7
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I agree with the other posts that weighting is best. However The factory reccommended pressure is posted by the drivers seat on the wall. There is a data plate. approx. 5 X 7 . These pressures are based on a max load.
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