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Old 03-16-2012, 10:56 AM   #1
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Tiffin Owners Club
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What air pressures do you run?

Just wondering what type of air pressures you consider safe. I am running Michelin 275/80R22.5's. I have had people tell me 95-105 is still safe. 40' Phaeton.

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Old 03-16-2012, 11:24 AM   #2
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Hi and welcome to the forum!

You can use our search function and find tons of reading material on the subject but nearly all of it will point you toward getting your coach weighed (all four corners if possible) and then going to the Michelin website to look up your particular tires and how much they should be inflated to in order to safely carry your weight and still provide a comfortable ride.

Good luck.


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Old 03-16-2012, 01:10 PM   #3
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The answer to "What pressure do *I* consider safe" might well kill you..

The correct question is: What pressure is PROPER for your RV.

RV Safety & Education Foundation

Go there and follow the links to the one for weighing your rig, it is a reasonable fee.

The procedure starts with a telephone or E-Mail "Interview" (What tires do you have and things like that, Where is the rig parked) Then they come out and look for a flat spot to scale you.. Then they use calibrated portable sacles, Much like the ones the diesel smokeys carry (in fact if you have a good friend who is a motor carrier officer or weighmaster.. That's an alternative)

Then they scale your rig, and hand you a piece of paper with the proper inlation pressures circled.. NOTE: They may be different depending on which wheel you are inflating.

OVER inflation.. (LIke running at the maximum pressure as far too man do) wears the center of the tread, gives a harder ride, ages the tire faster, and reduces your control in a bad situtation.

Under inflation, wears the outer tread, overheats the sidewalls, (leading to early tire failure) reduces your control but DOES, give a softer ride.

PROPER inflation, wears the tread evenly Is what the tire is designed to do, gives the BEST control in harsh conditions, Is to be desired. And for any given tire, that can be different depending on who's RV (Which RV) and which wheel on the RV.

So have it weighed.

You can also do it at any FLAT (not a bridge type) Scale.
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Old 03-16-2012, 01:29 PM   #4
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After weighing my RV, I checked the Michelin tables and it said 90 pounds all around. I added 5 pounds for a safety margin.
Wayne & Roberta and Maggie the Miracle Dog
08 Winnebago Destination 39W Gas UFO Workhorse Chassis
Making the Journey in our Destination

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Old 03-16-2012, 02:32 PM   #5
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Thanks Guys. I do plan on getting it weighed (4 corners).
Chuck and Tammy
2009 Phaeton 40' QTH
1982 CJ7 "The Bucket"
Joshua 24:15
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Old 03-17-2012, 02:12 PM   #6
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We had our unit weighted at Livingston, TX with Escapees, it is perhaps the best thing we did. We were told to take the weights that they came up with and go to the mitchelin side to see what our pressure should be. Turns out that we need 95 in the rear and 100 in the front. Get your coach weighted at all 4 corners separately so you have the right numbers. This will also help on the MPG and ride.

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