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10-05-2015, 07:38 PM
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#1
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Junior Member
Join Date: Jul 2013
Posts: 24
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Tires vs rims
Dealer sold me H rated tires to replace my F rated original tires. Max psi on old tires (original) was 85. New tires have a max 120 psi. Have not had it out yet so don't know how the ride will be. also am worried about what the max psi the rims are rated at. Motorhome is a 2004,28 ft., allegro. Ford F53 V10. Can't find placard on vehicle giving me this info. Any comments on tires or information? on the rims
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10-05-2015, 08:03 PM
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#2
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Senior Member
Join Date: Feb 2009
Location: Ca
Posts: 1,076
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I wouldn't worry. I prefer tires rated to carry more weight and rims are typically under rated for what they can actually carry.
No problem.
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10-05-2015, 08:21 PM
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#3
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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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You will have to go by the pressure stamped on the wheel or maybe Ford can tell you. Do not exceed that pressure under any circumstances as it can break a wheel. I had that happen to two wheels on our '88 Type B MH. Only cured the problem by going to Alcoa rims.
Basically that means you can't use the add'l capacity of the higher rated tires since you can't use the higher pressure.
__________________
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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10-05-2015, 08:45 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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Tires do not need to be inflated to the max psi. Have your RV weighed, and use the tire manufacturers load tables to determine the pressure for the tires. At max pressure the ride may be harsh. The pressure shown in the tables is the minimum required to support the weight listed.
FWIW- My previous MH originally had 22.5 inch load range G tires which required 105 psi based on the MH weight. Going to a 22.5 inch tire load range H tire, only required 85-90 psi to support the same weight because of the increased load capacity of the tire.
The difference in load capacity is shown on the sidewall at the max inflation pressure.
http://www.rvtirepressure.com/assets..._Inflation.pdf
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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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10-06-2015, 11:23 AM
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#5
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,519
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Don't worry about the tire max pressure, since it is very unlikely you will need it. Or even come close. Get your axle weight ratings and look up the actual tire pressure needed in the tire manufacturer tables. If the tire is the same size as the originals, the recommended pressure is going to be the same or very close to that of the F-rated tire. The H can safely go higher than the F, but it doesn't need to.
I hope the dealer didn't charge you extra for the carrying capacity you likely didn't need. I can see maybe going from F to G if the F was only marginally adequate, but jumping up to H seems like a big step.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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10-06-2015, 04:48 PM
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#6
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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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Manufacturers typically match the wheels and tires, so if your OEM tires were rated for 85 psi then chances are the wheels are also rated for 85 psi. The wheel rating is usually stamped on the inside of the wheel so you would need to dismount the tire to find it.
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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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10-11-2015, 12:52 PM
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#7
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Senior Member
Alpine Owners Club
Join Date: Jun 2004
Posts: 2,553
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Tires vs rims
To make it simple, in MOST cases an "H" rated tire will carry the same weight at the same pressure as an "F" rated tire in the same size.
I agree going from a "F" to an "H" is gigantic jump!
I this case I would politely disagree with Hooligan. Michelin does have some tires that don't fit the norm, but that is usually euro standards not RMA.
Do not lower your air pressure from your manufacturers specs until you know what the coach weighs (at least front and rear axle) and get the tire manufacturers load capacity chart. Then you could adjust accordingly if you wish.
I would bet your rim won't handle 120 psi if it is the OE wheel. OE just doesn't over kill like that.
All the above is just my opinion.
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Tom, Patty, Hannah "The Big Dog" and Abby Kat, Indianapolis, Indiana 2000 Alpine 36' FDS 72232, 2005 Blue Bird M450 LXI Our Photos
"We live out in our old van. Travel all across this land. Drive until the city lights dissolve into a country sky, just me and you - hand in hand." Zac Brown Band
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10-12-2015, 11:26 AM
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#8
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Junior Member
Join Date: Jul 2013
Posts: 24
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tires vs rims
Thanks everyone for the posts. Am running the H rated tires at 90lbs which will more than carry my weight. OE tires were 85lbs max and I am banking that the rims would have to have a safety factor of a least 10lbs over the 85lbs max tire pressure or the lawyers would have a field day. If the ride is too rough I can still go to 85lbs and still be ok according to the toyo load and pressure chart. Thanks again.
Bob
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10-16-2015, 01:07 PM
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#9
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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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Quote:
Originally Posted by lovenlif
Thanks everyone for the posts. Am running the H rated tires at 90lbs which will more than carry my weight. OE tires were 85lbs max and I am banking that the rims would have to have a safety factor of a least 10lbs over the 85lbs max tire pressure or the lawyers would have a field day. If the ride is too rough I can still go to 85lbs and still be ok according to the toyo load and pressure chart. Thanks again.
Bob
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I would not recommend running more PSI then the rim is stamped that it will support. (If I read your post correctly.)
I would get a four corner weight fully fueled up and loaded for travel. Consult the tire manufacturers PSI chart for that specific tire and load range, and use that as a baseline. I add 5 psi more on top of the recommended value, as a safety margin and for in case I do not get to check PSI on a regular basis.
I also agree that very seldom will a higher rated load range, and in this case with a two step up, not be safe to use the lower range tire's PSI setting. (So, if you were running 85psi before, then that would be safe to do so with the higher load range tires.)
Best to you, and please be very careful on PSI in relation to rim's Max Pressure ratings.
Smitty
__________________
07 Country Coach Magna Rembrandt 45' ISX600
Roo II was our 04 Country Coach Allure 40'
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