michelin tire pressure changed ???

[stanj34]

just happened to go to the michelin tire web site and look at the tire spec. sheet again after mayby a year and low and behold the tire pressures for the 235 80 r 22.5 xrv are way lower than when i first bought my new coach in 03. whats up ? anyone know why NOW ? and not then? when i spoke to the michelin rep. on the phone way back he insisted on 95 psi front and rear now the chart suggest i can go to 75 front and 80 psi rear.
anyone at this pressue now? on these tires?
stan

[stanj34]

just happened to go to the michelin tire web site and look at the tire spec. sheet again after mayby a year and low and behold the tire pressures for the 235 80 r 22.5 xrv are way lower than when i first bought my new coach in 03. whats up ? anyone know why NOW ? and not then? when i spoke to the michelin rep. on the phone way back he insisted on 95 psi front and rear now the chart suggest i can go to 75 front and 80 psi rear.
anyone at this pressue now? on these tires?
stan

[DriVer]

Could we have the year, make and model of your motorhome?

Go with the 95! I run 90 rear and 95 front.

[stanj34]

03 mountain aire 35 ft.
b
Based on what my corner weights are 95 psi is overkill and a poor ride.By the way koni shocks made for the best ride thus far and Im at 85psi ft & rr now. I just wanted to know why the change from michelin.
stan

[Gary RVRoamer]

Earlier versions of that tire had a lower max psi rating (100 psi) and have a different inflation table than later versions with a 110 psi max. I wonder if you were looking at the inflation table for the 100 psi version? The values are quite a bit lower.

The change occurred some time in 2001 and Michelin issued a service bulletin calling attention to it in October, 2001. The 100 psi tires were around for awhile after that, though, cause my 2002 built in Jan 2002 came with them. them.

[DriVer]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by stanj34:
I just wanted to know why the change from Michelin. </div></BLOCKQUOTE>Stan, We are seeing more often a requirement for the minimum pressure for the maximum load on RV and truck tires. It's difficult but any preconceived understanding that we had about automobile tires does not apply to our RV tires.

If you already know your corner weights and the tire chart recommends a pressure for that weight, just remember it's the minimum inflation pressure for that weight.

Running 5 or 10 psi more per tire is a good thing for many reasons mainly reduced friction between the bottom of the tire and the road. If you don't check your tires often it's possible for the tires to loose pressure over time and go below the minimum and this can cause an overheat condition and cause the tire to fail.

Go with 90 psi for the interim and see how that feels. I'm sure it won't yield too harsh of a ride and you'll have a bit more margin of air pressure in your tires.

I went up 5 psi front and rear and I'm running very well. Try it, you'll like it.

[repoman]

so just what is the recommendation for pressure - 95 lbs. 02 Dolphin 36'

[dengraham]

DriVer,
I also have XRV 285/80R 22.5 tires. Workhorse recommends 100 font/ 90 rear. Winnebago says 90 and 85. My corner weight would suggest 80 and 80. I don't know what to do? Any suggestions?

[DriVer]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by dengraham:
I also have XRV 285/80R 22.5 tires. Workhorse recommends 100 font/ 90 rear. Winnebago says 90 and 85. My corner weight would suggest 80 and 80. I don't know what to do? Any suggestions? </div></BLOCKQUOTE>I run 95 front and 90 rear. This most closely matches my GAWRs.

Now I know that if you had a W24, yes the recommendations are for 100 front and I'd probably run 95 in the rear but I would still want to know what the actual weights are for the drive and steer axles from a CAT scale. Knowing the exact weight I would round up the weight and inflate to that value. Remember the inflation tables for these tires recommend the "minimum pressure" for the maximum load.

Not at all like a car.

[dengraham]

Thanks Driver. I do have a w22. My rear weights are both 7,000 lbs and my front are both 3,600 1bs.

[Tom N]

The tires on your 38R are XRV 235/80R 22.5.

[Tom N]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> Now I know that if you had a W24, yes the recommendations are for 100 front and I'd probably run 95 in the rear but I would still want to know what the actual weights are for the drive and steer axles from a CAT scale. </div></BLOCKQUOTE>

Winnebago recommends 90 front and 85 rear for my Suncruiser 38R and I'm slightly heavier than an Adventurer 38R.

[Tom N]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> I also have XRV 285/80R 22.5 tires. Workhorse recommends 100 font/ 90 rear. Winnebago says 90 and 85. </div></BLOCKQUOTE>

Use 90 front, 85 rear. 100 in the front will provide a very rough ride and you'll shake your coach apart.

[dengraham]

Thanks Tom. Sorry about the typo. You are correct I do have XRV 235/80R 22.5