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Old 06-03-2015, 11:23 PM   #1
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1969 31' Sovereign
Auburn , Washington
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First time choosing tires for my Airstream

I need your help. I have a 1969 31 foot Sovereign International. It needs new tires. I have heard of using LT tires instead of ST tires on airstreams. I have 15 inch rims. What tires will work best for my TT. Any opinions are greatly appreciated. P.S. I'm scared of having a blowout because of picking the wrong tires.
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Old 06-04-2015, 06:28 AM   #2
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1987 32' Excella
Nepean , Ontario
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Go to 16" Michelin LTX tires and Centramatics. See http://www.airforums.com/forums/f438...in-128145.html
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Old 06-04-2015, 06:46 AM   #3
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1972 29' Ambassador
1962 19' Globetrotter
1951 21' Flying Cloud
Central , Texas
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Your trailer came from the factory with "Truck Type" 6 ply 7.00x15 tires when it was new. You can still find 7.00x15 bias ply tires, but they are old technology. A good radial LT235/75/15 Load Range C tire would suit your trailer just fine. There are many brands of that size and load rating to choose from.
I use Michelin LTX M/S2 P235/75/15 XL 108T Extra Load on my '72 Ambassador. Many people are using that same tire with very good results.
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Old 06-04-2015, 06:52 AM   #4
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1969 31' Sovereign
Auburn , Washington
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This was the tire I was leaning toward. How heavy is your Ambassador
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Old 06-04-2015, 06:55 AM   #5
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1969 31' Sovereign
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Never mind I looked it up we are about the same weight
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Old 06-04-2015, 06:59 AM   #6
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1972 29' Ambassador
1962 19' Globetrotter
1951 21' Flying Cloud
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Fully loaded for camping, she weighs 6,650lbs.

This summer will be the fourth season on the Michelins.

You may also want to look into a TPMS for additional precaution.
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Old 06-04-2015, 08:14 AM   #7
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1988 25' Excella
1987 32' Excella
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I also run the Michelin tires mentioned above. Look for the gross axle rating on the trailer name plate. The tires have to be rated to carry at least that much weight. The Michelin tires listed above are rated to carry 1985 lbs each for trailer use (DOT 10% reduction applied). So if your axle ratings are 3900 lbs or less each you can run these tires and they do work well. Some of the 6650 loaded weight is tongue wt so you are putting about 6000 lbs on the tires.

My 25' has a gross weight of 6800 and axle ratings of 3200 lbs each. It weights 6300 loaded for camping and puts 5600 lbs on the axles when hitched.

The only downside I have had with the Michelin LTX is that the first set developed a lot of surface cracking after 4 years and had to be replaced. I am 2 years into the second set now and all is well. But perhaps you should expect to replace them after 4 or 5 years. Probably a good idea anyway.
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Old 06-04-2015, 12:15 PM   #8
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1967 26' Overlander
Spartanburg , South Carolina
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A load range D tire gives a margin of safety. In general radial tires give a slight bit better ride than bias ply. I have run Goodyear Marathon ST 225/75R15's load range D on my 67 for the last 16 years with no problems. The tires I have been running were made in Canada. The set I just put on was made in China. Time will tell if there is a difference in Quality and longevity. ST tires are made to have stronger sidewalls than LT's which is to take the extra stress of tight turns. I have never measured my tire temperatures, but I feel both tires and hubs at every stop to ensure nothing has changed since my last stop. My temps have never been high enough to feel uncomfortable. You are doing the right thing to research info on tires and get experienced opinions. Also, I seldom exceed 60 mph and mostly keep to double nickels
when towing.
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Old 06-04-2015, 12:37 PM   #9
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1970 23' Safari
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Tire clearance

When I first bought my 71 Safari I put ST 225/75R15's because that is what was on it when I bought it. I did not watch them install these new tires but when I tried to remove them they were to fat to remove and real hard to reinstall. I had to pull out on the side of the wheel well more than I wanted to to remove them. It wasn't easy. I called the tire store and told them about my problem and they replaced with 7.00x15 bias ply tires. Can anyone give advice on this clearance issue?
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Old 06-04-2015, 12:54 PM   #10
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1969 31' Sovereign
Auburn , Washington
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Does anyone know the gross axle rating on a 1969 31' sovereign?
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Old 06-04-2015, 01:32 PM   #11
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1966 24' Tradewind
2005 22' Safari
Bastrop , Texas
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Quote:
Originally Posted by Top View Post
Your trailer came from the factory with "Truck Type" 6 ply 7.00x15 tires when it was new. You can still find 7.00x15 bias ply tires, but they are old technology. A good radial LT235/75/15 Load Range C tire would suit your trailer just fine. There are many brands of that size and load rating to choose from.
I use Michelin LTX M/S2 P235/75/15 XL 108T Extra Load on my '72 Ambassador. Many people are using that same tire with very good results.
We are running the LTX Michelins on our 05 Safari as well , performing flawlessly .
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Old 06-04-2015, 01:37 PM   #12
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1966 24' Tradewind
2005 22' Safari
Bastrop , Texas
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Quote:
Originally Posted by Bob Riffle View Post
When I first bought my 71 Safari I put ST 225/75R15's because that is what was on it when I bought it. I did not watch them install these new tires but when I tried to remove them they were to fat to remove and real hard to reinstall. I had to pull out on the side of the wheel well more than I wanted to to remove them. It wasn't easy. I called the tire store and told them about my problem and they replaced with 7.00x15 bias ply tires. Can anyone give advice on this clearance issue?
The trailer was designed and built for the tall narrow 700/15 6 or 8 ply tires .
the shorter , fatter 225/75r15's are too wide to fit between the hub and wheel well without pulling the side of the wheel well outward during removal and instillation.
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Old 06-04-2015, 01:59 PM   #13
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1996 25' Excella
Tillsonburg , Ontario
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They do not make Goodyear Marathon ST 225/75R15's in Canada anymore. and the Chinese are now making knock-offs from the technology they were given to make them for Goodyear. I have a set on my 96 25' Excella...came with them; look just like the Marathons ..I'll be keeping a close eye on them!

As in other posts on this subject, don't opt for an LT with too stiff a sidewall, and make sure they are well balanced.
JCW
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Old 06-04-2015, 02:24 PM   #14
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2011 34' Classic
Eastlake , Colorado
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Other than the Goodyear Marathon tires is there any others that are really good. I have had Michelins in the past and had problems with them. The first one blew out when I have 60% tread life left and the second blew out when I had 50% tread life left. I'll never own another set of Michelins do the poor quality in my opinion.
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