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04-28-2014, 05:30 PM
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#1
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2 Rivet Member
1976 25' Tradewind
xxxx
, Delaware
Join Date: Jul 2012
Posts: 34
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Help me verify tire spec please?
I am replacing all my tires on my 76 Tradewind, but I am tire ignorant. :/ I did read all the posts and decided to go with the Michelin LTX that a lot of people like. Question is do I have the right tire picked out and can I have them mounted on my existing rims and will the caps still fit? Is it a given or do I need to check something else on the existing tires, which say "Goodyear workhorse, 7.00-15LT, load range C"?
Thanks in advance.
http://www.tirerack.com/tires/tires....omCompare1=yes
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04-28-2014, 05:46 PM
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#2
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Rivet Master
Airstream Dealer
Corona
, California
Join Date: Feb 2002
Posts: 16,497
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Quote:
Originally Posted by merrypaws
I am replacing all my tires on my 76 Tradewind, but I am tire ignorant. :/ I did read all the posts and decided to go with the Michelin LTX that a lot of people like. Question is do I have the right tire picked out and can I have them mounted on my existing rims and will the caps still fit? Is it a given or do I need to check something else on the existing tires, which say "Goodyear workhorse, 7.00-15LT, load range C"?
Thanks in advance.
http://www.tirerack.com/tires/tires....omCompare1=yes
Attachment 210815
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We still recommend the Goodyear Marathons.
The correct size for your Airstream is ST 225/75R15.
Load range "C" is ok, but if you have them in use now, on steel wheels, you cannot increase the rating to "D". If you do, the wheels will split.
Andy
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04-28-2014, 05:58 PM
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#3
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Moderator dude
1966 26' Overlander
Phoenix
, Arizona
Join Date: Apr 2002
Posts: 7,510
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As long as the rim (wheel) is NOT changed the "caps" or wheel covers will fit after the tires are replaced.
As long as the rims (wheels) on your trailer are the original 15" in diameter rims, a 15" in diameter Michelin LTX tire (P235/75R15) will fit the old rim.
Data -
The P in the first part means the tire was designed for passenger vehicle applications. The 235 means the width of the tire. and the 75 means the side wall is 75% of the tread width. The 15 at the end means the tire fits 15" rim or wheel
applications. More readin about this can be found on that same site.
http://www.tirerack.com/tires/tirete....jsp?techid=46
>>>>>>>>>>>>>Action
__________________
1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!
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04-28-2014, 06:09 PM
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#4
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Rivet Master
2012 27' Flying Cloud
W
, New England
Join Date: Oct 2012
Posts: 7,402
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Also, because it's a P rated or Passenger tire, you also have to derate the load carrying capacity by 10% (which equates to 1984# per tire or a max load of 7936# for your tandem axle trailer). Have you weighed you trailer at the CAT scales?
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04-28-2014, 06:24 PM
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#5
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Rivet Master
1981 31' Excella II
New Market
, Alabama
Join Date: Sep 2011
Posts: 6,145
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You should be fine with those tires.
Perry
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04-28-2014, 06:32 PM
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#6
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Site Team
2002 25' Safari
Dewey
, Arizona
Join Date: Mar 2005
Posts: 15,618
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Those are the same tires I have on my 75 TradeWind. I have the aluminum wheels, but I believe they are the same size. The original tires on my trailer were 7.0 x 15 bias.
The new tires look great and tow well. I only have a few thousand miles on them, so far so good. I did notice that they don't run as warm as the bias tires and the pressure does not change as much when these tires get warm on the road. I run them at 50 psi cold.
__________________
Richard
Wally Byam Airstream Club 7513
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04-28-2014, 06:39 PM
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#7
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Rivet Master
1988 25' Excella
1987 32' Excella
Knoxville
, Tennessee
Join Date: Oct 2010
Posts: 5,118
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Great tires. I have been running them for 7 years and am on my second set. I have a 25' , 1988 Excella. It puts about 5500 lbs on the tires. With a load rating of almost 8000 lbs you should be fine with your 25' with lots of load carrying to spare.
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04-28-2014, 06:50 PM
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#8
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2 Rivet Member
1976 25' Tradewind
xxxx
, Delaware
Join Date: Jul 2012
Posts: 34
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Thanks all, My dream would be lost without everyone's knowledge.
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04-29-2014, 07:04 AM
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#9
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2 Rivet Member
1976 25' Tradewind
xxxx
, Delaware
Join Date: Jul 2012
Posts: 34
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Quote:
Originally Posted by Inland RV Center, In
Load range "C" is ok, but if you have them in use now, on steel wheels, you cannot increase the rating to "D". If you do, the wheels will split.
Andy
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Andy,
Are you saying I cannot use those Michelin tires if I have steel wheels? How do I know what the rating is on those tires? I have no idea if my rims are original or what metal they are. How can I tell?
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04-29-2014, 07:28 AM
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#10
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Rivet Master
Airstream Dealer
Corona
, California
Join Date: Feb 2002
Posts: 16,497
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Quote:
Originally Posted by merrypaws
Andy,
Are you saying I cannot use those Michelin tires if I have steel wheels? How do I know what the rating is on those tires? I have no idea if my rims are original or what metal they are. How can I tell?
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The tire load range rating, is on the tire.
The brand tire you use has nothing to do with the wheels.
History says, that a steel wheel can and will most likely fail, after many years of use, if the tire rating is increased from a "C" to a "D" rating.
Andy
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04-29-2014, 07:42 AM
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#11
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Rivet Master
1981 31' Excella II
New Market
, Alabama
Join Date: Sep 2011
Posts: 6,145
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The 235/75-R15 tire only use 50 psi max so the pressure should not hurt the rim. If you use E rated trailer tires and inflate them to 80 psi you will over stress the rim. The older trailers came with C rated tires that were 45 psi max. You should be fine at 50 psi.
Perry
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