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11-19-2013, 10:35 AM
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#1
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Senior Member
Monaco Owners Club
Join Date: Feb 2012
Posts: 305
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Reading Michelin Tire Inflation Table
Until I get a chance to have my MH weighed (soon), I am going by the coach's weight ratings. Front gross axel is 10,500 and rear is 19,000. It has dual tires on the rear axel. The 4 rear tires are all Michelin XZA2 Energy 275 70R 22.5 and I have attached the Michelin table for the size that are on the coach below. So each axel ENDis rated at 9,500. Michelin says "The loads indicated represent the total weight of an axle end, in an RV application" If I am reading the table correctly, my gross rear axel end is slightly below the lowest rating for these tires and I should inflate at 85? Is this correct, or am reading this wrong?
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Richard Anderson
2002 Beaver Monterey Seacliff, '13 Jeep Wrangler
Retired, fulltimer
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11-19-2013, 10:46 AM
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#2
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Senior Member
Join Date: Nov 2008
Location: Cosby, Tn
Posts: 6,587
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You are correct. Some owners inflate 5-10 psi above the table in order to allow for a side to side imbalance.
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Steve Ownby
Full time since 2007
2003 Monaco Signature
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11-19-2013, 03:02 PM
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#3
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,592
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These load/inflation charts are recommendations, not necessarily the optimum air pressure for your vehicle. Some folks swear the charts are the bible and are to be followed exactly. From my experiences, better handling and reduced tire wear are obtained with higher pressures than listed in the charts. I run closer to sidewall listed pressure.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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11-19-2013, 04:28 PM
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#4
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Senior Member
Freightliner Owners Club
Join Date: Apr 2002
Location: Pensacola
Posts: 2,728
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Manufacturers recommendations are for the minimum pressure needed to support that weight. Had the same results by going to a higher load range Goodyear tire on my MH. Although the minimum required was below 85#'s I found less squirm and a more stable ride at 90 psi. By the same token at pressures above 100psi, ride became noticeably rougher and did not track as well.
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Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel -1972 Moto Guzzi
2008 Suzuki Grand Vitara TOAD
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11-20-2013, 07:10 AM
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#5
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Senior Member
Winnebago Owners Club
Join Date: Jul 2013
Location: Buffalo, IA
Posts: 2,825
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Always be sure to maintain the minimum pressure for your axle weight, but experiment with a little more pressure and you will probably find you will get better tire wear up to a point and then the ride will get pretty hard and rough. You just have to find that happy medium between wear and ride, but always stay above the minimum...
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Terry & Brenda - From the Iowa Banks of the Mighty Mississippi
2011 Winnie Journey 34y, Freightliner / Cummins , 2012 Chevy Colorado Toad
[SIGPIC][/SIGPIC]
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11-21-2013, 10:10 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: Feb 2012
Posts: 305
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Thanks, everyone. I now feel much more confident about tire pressures.
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Richard Anderson
2002 Beaver Monterey Seacliff, '13 Jeep Wrangler
Retired, fulltimer
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11-21-2013, 05:30 PM
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#7
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Feb 2000
Location: San Jose, Ca, USA
Posts: 2,691
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Quote:
Originally Posted by Chiefbvfd
Always be sure to maintain the minimum pressure for your axle weight, but experiment with a little more pressure and you will probably find you will get better tire wear up to a point and then the ride will get pretty hard and rough. You just have to find that happy medium between wear and ride, but always stay above the minimum...
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I had my rig weighed and got the corner weights - the results showed that I could reduce the pressures in my tires considerably from the manufacturer's recommendation. I wrote to Michelin to confirm the numbers and they did, indeen, confirm that I could actually run my tires at 80/85 front/rear instead of 95/90 front/rear. But then they said that I should follow the manufacturer's recommendation rather than their recommendation! So, since I've had no problems running at the higher pressures I decided to continue, but I'll use the lower values to set the limits for my TPMS system, giving me a wider range before I get a low pressure alarm.
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Alan Hepburn - San Jose, Ca
2007 Bounder 35E being pushed by a 2020 Jeep Gladiator Sport S or a 2022 Jeep Wrangler Unlimited (JLU) Sport S
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11-21-2013, 05:34 PM
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#8
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Senior Member
Join Date: Jul 2011
Posts: 792
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I adjusted my tire pressure according to their chart and we were much happier with the ride and handling.
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2011 Itasca Suncruiser, Jeep Grand Cherokee toad
MSgt retired USAF 1988, AA retired 2005
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11-25-2013, 03:42 PM
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#9
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,519
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The RV manufacturer's recommendation usually assumes a fully loaded axle. That's the only way they can do it, since they have no idea how much weight you will really carry. Therefore the information on the RV manufacturers tire placard is nearly always a worse-case number (each axle loaded to its max capacity). If you actually run less weight, you can reduce the pressure, but it's still smart to stay on the high side of the minimums shown in the tire tables.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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11-26-2013, 11:00 PM
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#10
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Senior Member
Join Date: Aug 2010
Location: Over the next hill, around the next curve...
Posts: 5,659
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Also realize the chances are very high that you will have one side wight more then the other. Until you do four corner weighting, you may want to say add 750lbs and use 10,250 to check the chart. I'm in the group that adds 5 PSI to the chart's number. Load shifts, running long distance with steady cross winds loading the leeward side, etc.
Also realize that your duals are carrying half the axle load, so remember to divide say that 10,250 by 2.
Best of luck, be safe, have fun,
Smitty
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07 Country Coach Magna Rembrandt 45' ISX600
Roo II was our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
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