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06-22-2012, 06:25 PM
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#1
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Member
Join Date: Jun 2012
Posts: 87
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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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06-22-2012, 06:32 PM
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#2
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,678
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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?
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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06-22-2012, 06:35 PM
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#3
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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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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06-22-2012, 06:41 PM
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#4
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Senior Member
Join Date: Jul 2011
Posts: 792
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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.
__________________
2011 Itasca Suncruiser, Jeep Grand Cherokee toad
MSgt retired USAF 1988, AA retired 2005
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06-22-2012, 08:09 PM
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#5
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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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.
__________________
Home is where I park it!
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06-22-2012, 08:33 PM
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#6
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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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."
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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."
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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.
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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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__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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06-23-2012, 02:35 PM
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#8
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,678
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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.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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06-23-2012, 06:25 PM
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#9
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Member
Join Date: Jun 2012
Posts: 87
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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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06-23-2012, 06:45 PM
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#10
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Senior Member
Workhorse Chassis Owner
Join Date: May 2009
Location: Kansas City, MO./Pollock, LA.
Posts: 1,556
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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.
__________________
06 Hurricane 34FT WH W20 Chassis 8.1L 132K, Steersafe, Koni Shocks, DIY Trac Bar, Tri-Metric 2025RV Battery Monitor, 4-6V Batteries, Scan Gauge 2, Crossfires, 735W Solar Morningstar MPPT-60, WG T4 In-Motion Sat, XM Radio, 07 Chevy Malibu Maxx Toad, Falcon 2, Brake Buddy, Escapee
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06-23-2012, 07:08 PM
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#11
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Senior Member
Thor Owners Club
Join Date: Aug 2010
Location: Delaware
Posts: 614
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Quote:
Originally Posted by Mr_D
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.
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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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