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Old 06-22-2012, 07:25 PM   #1
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How much air Michelins

06 Hurricane 34n 245 70 19.5 with new Michlens XZE's.Dealer put 100 lbs of air in them is that too much?
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Old 06-22-2012, 07:32 PM   #2
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There is a tire & weight placard on the sidewall next to the driver seat. It will have the recommended pressure until such time as you can get it weighed and adjust tire pressures for actual weight on each axle.

The XZE 245/70R19.5 comes in two models - Load Range G & Load Range H. 100 psi is too much for the G - it's max is 95 psi. The H can handle up to 120 psi and at 100 psi can support an 8540 lb front axle and 16,i60 lb rear axle. How do your axle ratings compare to that?
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Old 06-22-2012, 07:35 PM   #3
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Welcome to irv2.
Dealer put to much for your 19.5 tires must be riding hard.
If you get your coach weight at truck scales than follow the MFG's tire inflation tables for your size tire you will have a softer ride and better wear.
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Old 06-22-2012, 07:41 PM   #4
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007 is correct. I weighed my coach & set the tire pressure according to Michlens web site. It will show your tire model & pressure according to weight. I lowered my pressure from the Ford data plate & improved ride/handling was the result.
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Old 06-22-2012, 09:09 PM   #5
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There are two pressures all but guaranteed to be the WRONG pressure for your tire.

One is on the placard inside the coach someone else mentioned, That may be for the coach as delivered, or as "Average loaded" (who loads average) but not the way you load it.

The other is molded into the side of the tire, that one in your case is 100 PSI.

The proper weight is found by weighing the coach, EACH WHEEL, either by methods outlined in the forum library or by calling Aweigh We Go which can be found at RV Safety & Education Foundation and asking them to come out, Reasonable fee.
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Old 06-22-2012, 09:33 PM   #6
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The pressure on the sidewall of a Michelin RV tire and many others is not the "Maximum" the tire should ever have (unlike car tires) it is the minimum to support the maximum rated carrying capacity of the tire.

From the Michelin RV Tire Guide:
Quote:
"If you look at the tire's sidewall, you'll see the maximum load capacity allowed for the size tire and load rating, and the minimum cold air inflation needed to carry the maximum load."
From page 6 of the GoodYear RV Tire and Care Guide:
Quote:
"How much air is enough?
The proper air inflation for your tires depends on how much your fully loaded RV or trailer weighs. Look at the sidewall of your RV tire and you’ll see the maximum load capacity for the tire size and load rating, as well as the minimum cold air inflation, needed to carry that maximum load."
From TOYO:
Quote:
Q: What are the consequences of inflating the tires to accommodate the actual loads?
A: If the inflation pressure corresponds to the actual tire load according to the tire
manufacturer’s load and pressure table, the tire will be running at 100% of its rated load at that pressure. This practice may not provide sufficient safety margin. Any air
pressure loss below the minimum required to carry the load can result in eventual tire
failure.
But then they go ahead and publish a weight/pressure chart allowing lower pressure for RV's!!

From the August 2010 Motorhome Magazine "Tread Carefully" tire article:
Quote:
The maximum load capacity allowed for the size tire and load rating and the minimum cold air inflation needed to carry that maximum load are located on the tire’s sidewall.
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Old 06-22-2012, 09:48 PM   #7
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Here is the link to the Michelin RV guide, which provides the air pressure recommendations.

http://www.michelinrvtires.com/asset...esBrochure.pdf

here is the website for the downloads:
Michelin North America RV Reference Materials Page
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Old 06-23-2012, 03:35 PM   #8
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The tire pressure on the placard is nearly always (for legal liability reasons) the psi needed to support the axle at its max weight load. This is typically (but not always) more than the "as delivered" or even the "as the customer drives it" axle loading. It's a pretty safe bet - just not the optimum for the rig as the owner uses it.
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Old 06-23-2012, 07:25 PM   #9
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Air presure

Thanks to all,Good to have people to count on in time of need.I will try to figure it out with your info
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Old 06-23-2012, 07:45 PM   #10
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You can also try this. On level pavement draw a line across your tires with chalk. Drive a few rotations and look at the wear patterns. If the they wear in the middle-too much air. If the chalk wear is on the outer edges --too little air. It works, try it and see how it compares to the air pressure charts.
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Old 06-23-2012, 08:08 PM   #11
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Quote:
Originally Posted by Mr_D View Post
From TOYO:Q: What are the consequences of inflating the tires to accommodate the actual loads?
A: If the inflation pressure corresponds to the actual tire load according to the tire manufacturer’s load and pressure table, the tire will be running at 100% of its rated load at that pressure. This practice may not provide sufficient safety margin. Any air pressure loss below the minimum required to carry the load can result in eventual tire failure.
Which is why many of us use the pressures calculated from actual weights and manufacturers' tables ... and then add a 5-lb. "fudge factor."
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