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Old 09-05-2006, 04:24 PM   #1
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I've been running 90 psi all around. The Michelin tires say 105 psi.What do you guys run in your units? I know several of you have the same coach as mine and I respect your opinions.I don't carry a lot of stuff and only the two of us plus Brandy (our cat). Thanks in advance for your replys. Bob
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Old 09-05-2006, 04:24 PM   #2
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I've been running 90 psi all around. The Michelin tires say 105 psi.What do you guys run in your units? I know several of you have the same coach as mine and I respect your opinions.I don't carry a lot of stuff and only the two of us plus Brandy (our cat). Thanks in advance for your replys. Bob
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Old 09-05-2006, 04:36 PM   #3
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Howdy, I venturing in from other forums and previously owned motorhomes. The only way to know waaht tire pressure to run is to weigh your coach on all four corners. Knowing what your tire loads are, you go back to the tire manufacturer for a chart listing the max tire loading at varying pressures for both single and dual applications. See what your highest tire load on the front is and look up the pressure on the chart. I ran both front tires the same pressure which was about 10 psi over the tire chart. Do the same for the rear tires, only use the dual tire ratings.

Sometimes the local tire boys don't want to bother having to get the charts, but they are available.

Usually the local tire shops will run the tires up to the max pressure which are based on maximum tire loading. Hopefully you are not at maximum tire loading. running maximum tire pressures wwill lead to a rough ride and premature tire wear.

Hope this helps.

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Old 09-05-2006, 06:08 PM   #4
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nowrelxn: what Ken said is correct. You NEED to invest a few bucks and get your KSCA 3740 onto a scale. At the very least get the front axle weight, and then pull onto the scale completely. Subtract front (only) from total and you will have a pretty close idea of how much is on the rear axle. You should do this while on a trip, with full fuel and 1/2 tank of water, unless you ALWAYS travel with full water and holding tanks. You can fill up at a truck stop with "CAT" scales, and then get weighed so you have real world conditions-as you actually travel.

Until you get weights and can accurately inflate your tires according to the charts, I'm going to recommend you increase yours to at least 95 rear and 100 in front. Hopefully, this pressure is higher than your actual load will call for, but it is safer to be over pressure. That is the pressures I run in mine, and I'm pretty well maxed out to the W-22 GVWR. An under-inflated tire can over heat and blow out with disasterous concequences.

The tire sidewall is MAXIMUM pressure of 110psi cold. This is meant to be the pressure you should NOT exceed (cold). You won't need to go that high (read hard, harsh ride), but the Michelin experts tell you that you MUST run at maximum sidewall pressure WHEN you do not KNOW what your actual weights are. Good luck, travel safely, and GET THOSE WEIGHTS! ED
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Old 09-05-2006, 06:14 PM   #5
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I run my tires at 85 rear and 90 front for my load, rear axel 14500 limit front 8500. I had my coach weight at a CAT Scale. Full gas,LPG,loaded with food, personal wear, WATER HEATER,1/2 WATER TANK. Like Ken says you have to get your coach weight because you may carry more or less than I OR anyone else. Before I left to weight coach I measured the air pressure of tires, by the time I got to scales tire pressure had increased 10 to 15 lbs on each tire in 20 miles. I have Michelin all around and never had a bad tire like others complain about on 5 coachs.
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Old 09-06-2006, 10:17 AM   #6
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Thanks for your replys.Its great to be able to get information from the professionals.You guys are great on this forum. I know I must get my weights, but Iwas just curious as to what you guys with the same coach as mine were inflating your tires to. Bob
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Old 09-06-2006, 07:32 PM   #7
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OK:

I know that I need to do the "weigh it" thing to determine correct tire pressures, but I have been searching the net like crazy for "public scales" and "truck scales" in the Chicago area.

Does anyone know of a public scale in the NW Chicago suburbs that allows RVs to weigh (4 corner)?

Thanks
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Old 09-07-2006, 08:04 AM   #8
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Dave try catscale.com/locator.shtml found to many to post. While four corners is best at least you can get both axel weights on split scale. If you could gain access to both sides of coach maybe able to weight four wheels.
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Old 09-08-2006, 02:38 AM   #9
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Thanks "Mr Bond" I'll try that. It is kinda tough sometimes owning a Class A in this neighborhood. There are no real good RV resources close by. But, luckily we have IRV2!
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