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11-03-2013, 11:19 AM
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#581
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Rivet Master
2005 25' Safari
Salem
, Oregon
Join Date: Mar 2006
Posts: 8,367
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Quote:
Originally Posted by SteveH
Being that Goodyear brings us the ST Marathon tire, and it's history, I'm not so sure I even care what they say my tire's inflation should be.
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Hi,
__________________
Bob 2005 Safari 25-B
"Le Petit Chateau Argent" Small Silver Castle
2000 Navigator / 2014 F-150 Eco-Boost / Equal-i-zer / P-3
YAMAHA 2400 / AIR #12144
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11-03-2013, 11:46 AM
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#582
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Rivet Master
2005 39' Land Yacht 390 XL 396
Common Sense
, Texas
Join Date: Sep 2007
Posts: 5,319
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Yea, well, I might listen to them if I were inflating a blimp.
__________________
Regards,
Steve
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11-03-2013, 12:16 PM
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#583
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Rivet Master
2005 25' Safari
Salem
, Oregon
Join Date: Mar 2006
Posts: 8,367
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Hi, I think if you could eliminate ST tires form Goodyear's product list, they actually have great tires. [one bad apple]
__________________
Bob 2005 Safari 25-B
"Le Petit Chateau Argent" Small Silver Castle
2000 Navigator / 2014 F-150 Eco-Boost / Equal-i-zer / P-3
YAMAHA 2400 / AIR #12144
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11-03-2013, 01:06 PM
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#584
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Moderator
2015 25' FB Flying Cloud
2012 23' FB Flying Cloud
2005 25' Safari
Santa Rosa Beach
, Florida
Join Date: Jul 2006
Posts: 13,153
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I guess Goodyear must make a cajillion dollars on their marathons as they really give them a black eye. I used to buy exclusively Goodyear tires. After my Marathon experience on the Airstream, I have never bought another Goodyear tire of any kind.
Brian
__________________
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with ProPride
2020 Silverado 2500 (Vivian)
2023 Rivian R1T (Opal)
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11-03-2013, 03:02 PM
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#585
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Rivet Master
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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Oh yeah, a Goodyear table for our Michelins.
__________________
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts
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11-03-2013, 08:11 PM
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#586
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Rivet Master
2002 30' Classic S/O
Garden Valley
, Idaho
Join Date: Jul 2010
Posts: 1,631
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The bottom line question for me was how many ST tires I have had ,including GYM's, have had the tread totally seperate and almost destroy my AS wheel well vs how many Michelin tires have I ever heard of that had a tread seperate. The answer was a whole bunch of ST's losing tread or side wall death and NONE on the Michelin side. Yes I have seen Michelin's have flats, on trucks, but you can't predict nails, but in 40 years of either running Michelins or knowing friends that run them, I have never heard of a tread seperation. Every failure of ST's for me have been tread seperation. I'll bank on Michelin LT's way before I will trust ST's on my AS, ever again.
Pap
__________________
2008 F-250 4X4 Lariat V-10
2002 Airstream Classic 30' w/SO #2074
2007 Kubota 900 RTV
1996 Ford Bronco
2007 Lincoln LT
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11-04-2013, 03:48 AM
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#587
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Rivet Master
Commercial Member
2019 27' Tommy Bahama
London
, Ontario
Join Date: Aug 2007
Posts: 1,343
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From Doug; Oh yeah, a Goodyear table for our Michelins.
I can see how you would wonder about that but this table is the same for every tire of the same size and type. Load inflations are done to an industry standard, that is why you will see every mnfr of a 225/75 E tire has the identical load capacity. The worst and best quality tire are treated equal. An ST tire has a different standard to meet than a LT tire so it gets a higher load rating on a less robust tire.
To put it another way, The Marathon is rated 400 pounds higher capacity than at 235/15 Michelin. You could put 225 Marathons on one side of an Airstream and 235 Michelins on the other and keep adding weight until you had a tire failure. I am certain the Marathon's would give out long before the Michelins did.
To give you an extreme example of this. We would often change 34's to 235/60R x 16" performance Michelins. The low profile tire rode smoother, handled nicely and it was like tossing out an anchor if you did a panic stop as well they just looked cool. We did about 100 of them starting in 1993. A couple of years ago a customer with one of these 34's hit a curb in Texas and bent his right front wheel on about a 20 degree angle. They did not have time to wait for an axle and had to get back to Ontario. If he had called me I would have sent him into a tire store to get 2 225 LT's put on for the trip home since he would be running on 5 tires. He did not call however he just drove it back to us. The 235/60 Performance tires were 35% over their load capacity looked half flat and yet ran 1500 miles and are still on it today. I doubt you would run an ST tire very far 35% over its capacity.
Andrew T
__________________
Andrew Thomson London, Ontario
"One test is worth a thousand expert opinions." Tex Johnston, Boeing 707 test pilot
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11-04-2013, 06:35 AM
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#588
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CapriRacer
I'm in the
, US
Join Date: Sep 2012
Posts: 989
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Quote:
Originally Posted by field & stream
........That was almost 9 years ago! Have things changed, or is this table still good?
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The table would still be good, as these sorts of things do NOT change over time (except to make typo corrections) - BUT - new sizes are being added all the same, so the list might be incomplete.
And, yes, you can use a Goodyear table for a Michelin tire as these are industry tables and everything you see published is the same industry table regardless of manufacturer.
And one last thought: These industry tables are MAXIMUM load for a given inflation pressure. You should use the inflation pressure as a minimum, not a recommendation. (BTW, none of these tables ever say "recommendation". That should be a clue not to take them at face value.)
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11-06-2013, 06:37 PM
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#589
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,694
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You can have 80 lbs. in a Load Range E tire and it will ride firmer and transmit that to the trailer. You will probably be putting into more air than necessary ti support the trailer. But more pressure means stiffer sidewalls, and some people prefer that. It is a tradeoff.
We settled on 72 psi on the 16" Michelins since the way the tire was wearing told me that was the right pressure—I used the trial and error engineering method.
Gene
__________________
Gene
The Airstream is sold; a 2016 Nash 24M replaced it.
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11-06-2013, 07:31 PM
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#590
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retired USA/USAF
2001 30' Excella
Somerset
, New Jersey
Join Date: Jan 2009
Posts: 2,418
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New shoes for our Airstream. Finally got it done. Sendel T-03 wheels and Michelins.
Thanks all for motivating me to do this. Took it for a ride today to seat the newly packed bearings and all's good for our winter trip.
See ya'll on the road sometime.
I tried to include photo's but didn't work. I'll try again.
__________________
Roger in NJ
" Democracy is the worst form of government. Except for all the rest"
Winston Churchill 1948
TAC - NJ 18
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11-06-2013, 07:47 PM
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#591
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retired USA/USAF
2001 30' Excella
Somerset
, New Jersey
Join Date: Jan 2009
Posts: 2,418
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Here goes again with photo's.
__________________
Roger in NJ
" Democracy is the worst form of government. Except for all the rest"
Winston Churchill 1948
TAC - NJ 18
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11-07-2013, 10:08 PM
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#592
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Rivet Master
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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Quote:
Originally Posted by Andrew T
We have the best results carrying the correct tire pressure for the load the tire is carrying. The attachment is the RV load inflation table from Goodyear's website.
Here are the pressures for a 225/75R x 16 LT:
80psi 2680 pounds,
65psi 2335 pounds,
50psi 1940 pounds,
45psi 1790 pounds,
40psi 1650 pounds,
35psi 1500 pounds.
To use this chart you really should weigh your combination connected & loaded for travel on a sectioned scale.
For example the last Eddie Bauer I weighed with a customer was 6700 pounds on the axles (motor cycle inside) or 1675 pounds per tire. Generally I will add 10% to that number for variences in side to side load and the possibility that the scale is out a little so 1850 pounds per tire. Using the chart you could call it at 47 PSI but we went with 50 psi. 50 PSI has several advantages over 80 PSI; a smoother ride for the Airstream, shorter stopping distances espessially when wet and more even tread wear.
Some trailers & fifthwheels with corners are built with 225 Marathons right at their limit just over 10,000 pounds on tandem axles. In those cases we use the 225/75R x 16" LT with 80 psi.
From 1971 - 1984 a factory option on a new Airstream was Michelin 7:00 x 15" load range "C" tires. There were thousands of Airstreams built with these and tire trouble was very rare. I know many would say those trailers were lighter but actually many were not. The brochure weights in those days did not include options and everything was an option. By the time you added awnings, ac, double pane windows 2 door fridge etc. they weighed about the same as the new ones. Generaly 70's units tow a little easier because they are narrower and little more aerodynamic.
Years ago we could buy 225/75 x 16 Michelins in load range C which was a better match for most Airstream's but they are no longer available.
I know this is confusing and it is always easier to assume that bigger and heavier and more pressure has to be better but everthing has its compromizes.
Andrew T
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Okay, after 10,000 miles on our FC 25' rear bed with 16" Michelins at 80 psi, I am taking the advice and experience of Andrew T using the table to run at a lower pressure. CapriRacer has also suggested this may be correct.
Andrew T. uses the example of a Eddie Bauer with a motorcycle inside set at 50 psi, probably similar to our rear bed with travel load. It may be a while before I can get to a scale with travel load, so I am thinking in the 50-60 psi range would be our good for our Airstream with no loss of reliability.
I think a soft ride for the Airstream is important, have been concerned about it, and that is why I will reduce tire pressure.
__________________
Doug and Cheryl
2012 FC RB, Michelin 16, ProPride 1400
2016 Ram 1500 Laramie Crew Cab 4X4 Ecodiesel 3.92 axles
The Truth is More Important Than the Facts
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03-23-2014, 11:49 AM
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#593
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2 Rivet Member
2007 19' Safari SE
La Center
, Washington
Join Date: Jan 2008
Posts: 75
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My own wheel / tire upgrade, following advice / recs from Phoenix
Completed today
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03-23-2014, 12:23 PM
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#594
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Rivet Master
2002 30' Classic S/O
Fleming Island
, Florida
Join Date: Nov 2013
Posts: 4,667
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I went looking to see if Michelin published similar data to that from Goodyear. The only data I could find for RV use was for XPS Ribs. But I found this tire manual that has inflation data for use on light trucks as well as RVs.
http://www.tiregroup.com/Catalogs/PD...s/Michelin.pdf
According to the table for light truck service the load at pressure for the M/S, XPS Rib and others in truck service is the same. When I convert to 16" I'll probably use this data rather than inflating to 80 psi.
Al
__________________
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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03-24-2014, 06:04 AM
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#595
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CapriRacer
I'm in the
, US
Join Date: Sep 2012
Posts: 989
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Quote:
Originally Posted by Al and Missy
I went looking to see if Michelin published similar data to that from Goodyear. The only data I could find for RV use was for XPS Ribs. But I found this tire manual that has inflation data for use on light trucks as well as RVs.
http://www.tiregroup.com/Catalogs/PD...s/Michelin.pdf
According to the table for light truck service the load at pressure for the M/S, XPS Rib and others in truck service is the same. When I convert to 16" I'll probably use this data rather than inflating to 80 psi.
Al
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Just be aware that those charts are MINIMUMS, not recommendations.
I'd recommend using an inflation pressure with a 15% grater load carrying capacity than the worst tire loading.
And if you don't have individual tire loadings, use an additional 10% if you only know the loading by axle and 15% more if you only know that loading for both axles combined.
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05-27-2014, 12:01 PM
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#596
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de NO1PC
2004 30' Classic
1988 29' Excella
Campbell
, California
Join Date: Jul 2012
Posts: 70
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What is involved in the 16" up-conversion? Just wheels and tires or is there an axle/shock 'adjustment' also being done to accommodate?
__________________
------------------
Enjoy the ride! Best 73!
de Jim, NO1PC
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05-27-2014, 12:04 PM
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#597
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Contributing Member
2018 Interstate Grand Tour Ext
Austin (Hays County)
, Texas
Join Date: Jun 2002
Posts: 7,164
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Quote:
Originally Posted by JimAspinwall
What is involved in the 16" up-conversion? Just wheels and tires or is there an axle/shock 'adjustment' also being done to accommodate?
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Just wheels and tires. Some few units need a little cutting back of the trim at the trailing end of the wheel opening. Mine did on one side only.
__________________
John W. Irwin
2018 Interstate GT, "Sabre-Dog V"
WBCCI #9632
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05-27-2014, 12:05 PM
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#598
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Moderator
2004 30' Classic Slideout
Fenton
, Missouri
Join Date: Mar 2002
Posts: 10,401
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16" wheels/LT tires
Wheel, tire was all I needed. Clearances were fine. You may have to do some adjustments to the spare tire carrier to accommodate the larger tire.
Jack
__________________
Jack Canavera
STL Mo.
AIR #56 S/OS#15
'04 Classic 30' S.O.,'03 GMC Savana 2500
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05-27-2014, 01:41 PM
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#599
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Rivet Master
2012 25' FB International
Trent Woods
, North Carolina
Join Date: May 2013
Posts: 3,120
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Just wheels and tires. I left the 15" in the spare and only bought four new tires, as recommended elsewhere in this thread or in one of the 500 other threads about this.
Larry
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05-27-2014, 01:53 PM
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#600
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Contributing Member
2018 Interstate Grand Tour Ext
Austin (Hays County)
, Texas
Join Date: Jun 2002
Posts: 7,164
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I also kept my best 15" tire and wheel for a spare. Solves the spare tire carrier fit and saved me cash. I have no worries about traveling with the 15" spare if needed.
__________________
John W. Irwin
2018 Interstate GT, "Sabre-Dog V"
WBCCI #9632
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