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Old 04-07-2009, 03:23 PM   #1
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Discrepancy in Tire Pressure Recommendation

My Workhorse web site says that my front tires should be inflated to 100 psi and the rear to 90. However, the plaque on my door reads 90 and 85 and that's what I have always kept them at. FWIW, never, not once, have I had to add air to my tires since I've had them (almost five years). And yes, I do check them regularly. I also have never had to add oil between changes, but that's for another thread.

I wonder why the difference in the two readings? Since it comes from the factory (I assume first from WH and then from Winnebago), why aren't they the same? I don't plan to change my pressure, but it just makes me wonder????

Denny & Kylene, Abby (Golden) and Josie (Sheltie),
2004 Itasca Suncruiser 38R, W22, Ultrapower
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Old 04-07-2009, 04:13 PM   #2
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Golden, the sticker on my motorhome located near the park brake pedal, is the Workhorse factory sticker, and shows the tire pressure for the installed tires at GVWR. In my case, that gross weight is 20,700 lbs. After a weight check fully loaded, and my wife and self aboard, I am under that weight quite a bit, and run my tires at a lower pressure accordingly. Perhaps, the sticker from Winnebago is for a different weight. The sticker I am referring to gives the front, rear, and combined gross axle weights, and the tire size. It is from Workhorse, and applied at the coach makers facility during manufacture.


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Old 04-08-2009, 02:36 AM   #3
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The website data may be for current year of production on the W22 and may be different than your chassis model year. The correct way, is to weigh the coach and set tire pressure according to the manufacturer of the tires pressure chart. Do not exceed the maximum pressure for the wheels and do not over load the coach.
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Old 04-08-2009, 06:02 AM   #4
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I agree with RV Wizard. The sticker inside my MH was way off because I had replaced the tires, same size but things changed over the years. I went up on Goodyears RV Tires website and got a chart from them on my tires. You can also get the same chart from Michelin (or call them they are real responsive) Then I went to a truck stop with a CAT scales and weighed each axle fully loaded and fueled. Then looked up my correct tire pressure and added 10% to it for safety. This 10% for safety is so you never drive with too low of a pressure and damage the tires. It is recommended in all the articles in both major MH magazines. Like RV Wiz said never go over the max amount pressure written on the side of the tires when cold.
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Old 04-08-2009, 07:51 AM   #5
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The Workhorse web site gives you the tire pressure for the max weight on that axle because they do not know what is going to be put on that chassis. The sticker in the MH is what the MH manufacture recommends for the weight of the unit they put on the chassis. If you have not weighed your MH I would run What the MH manufacture recommends + 5lbs.
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Old 04-08-2009, 11:59 AM   #6
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Well, You taught me something just now

I used to say there are two tire pressures that are all but guaranteed to be wrong (one of them happens to be right on my rig)

1: The pressure on the sidewall of the tire (If you read, like I read, you will find that the pressure is not what you think it is, the tire says "Max Load xxxx pounds at max pressure of yyy PSI" If you are not at the max load, then the max PSI is too much!!!

2; The pressure on the sticker in your rig (It might be right if the rig is empty and dry)

and what you taught me is 3: The pressure on the chassis maker's web site

Workhorse makes a chassis, You have two main rails, a few cross rails, a sheet of plywood with a box on it, a dash, which by the way is in the box, Steering Wheel, motor, transmission, axles and wheels. They have no idea what is going to sit atop those rails weight wise so there is no way they can recommend a tire pressure save for the empty chassis

So ignore the lot of 'em

Now: How to properly inflate the tires

Step one CLICK HERE On the left side of your screen is a link (in face a couple of links) For and about getting your rig weighed

They come out, weigh your rig, using portable scales, take your money (About 30-40 bucks) and tell you how much pressure to put in each tire.

Note 1: Duals are two tires, but one wheel

Note 2: Each wheel will have it's own proper pressure

If you tell 'em what your rig is wearing, they will make sure to have the right charts in hand when you meet
I mean
Nothing adds excitement like something that is none of your business.
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Old 04-08-2009, 05:31 PM   #7
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If you have any doubt about what air pressure you need in your tires you should weigh your motor home, front and rear axles, and tag if applicable, separately, then go to the manufacturer web site to get the correct pressures based on the type of tires you have and your axle weights. Best way is to get the individual weight carried by each, or each set of, tires, but finding a scale that measures the wheels separately are hard to find. You should not guess when it comes to tire pressure for your motor home, tires are to expensive to be running under inflated, and putting up with the high heart rate when one blows is hard for a lot of people to take!

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Old 04-08-2009, 06:54 PM   #8
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Spikster.. Finding wheel scales is just about the easiest thing on earth

Two ways: Re-read your post, then re-read the post above yours, (mine) and you will find a link Click on it. There you are, the scales are on the left side of your screen.. Just click on the proper link and make an appointment

Or.. Talk to the motor carrier officers/weighmasters for wherever you are.. Odds of them having the very same scales that Aweigh-We-Go, is right around 100% and many of 'em will be more than happy to weigh you in if you ask nicely.

Nothing adds excitement like something that is none of your business.
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