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Old 07-09-2005, 01:25 PM   #1
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1970 25' Caravanner
Pasco , Washington
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Type of Tires for Trailer

We have a 25 foot 1970 airstream trailer. Looking to put new tires on it. We have gotten different advice from people as to what type to put on. Some say 8 ply and the others say 6 ply due to the rims might split with the 8 ply. The rims that are on the trailer right now are not split rims. Can anyone help clear this mess up my trailer needs new tires!
Thanks
Liz
Pasco WA
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Old 07-09-2005, 01:52 PM   #2
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Type of Tires for Trailer

Greetings Liz!

Welcome to the Forums!

Quote:
Originally Posted by bubba99301
We have a 25 foot 1970 airstream trailer. Looking to put new tires on it. We have gotten different advice from people as to what type to put on. Some say 8 ply and the others say 6 ply due to the rims might split with the 8 ply. The rims that are on the trailer right now are not split rims. Can anyone help clear this mess up my trailer needs new tires!
Thanks
Liz
Pasco WA
There are several issues to be considered when choosing tires for your coach. One of the often stated caveats is to avoid changing from a Load Range C to a Load Range D tire unless the rims are also replaced -- the caution has been that change to the higher Load Range tires can cause issues with the existing rim(s). I know that the first time I replaced the tires on my Overlander, I asked my GoodYear dealer to order new trailer rated rims with 2,600 pound capacity as a means of insuring that I had the correct rims as well as providing a good time to switch to Load Range D tires. Basically, I went into my GoodYear dealer and asked that he measure the clearances on the coach as well as the wheels and order the correct tires and wheels; this procedure meant that if either posed a problem with fit when they arrived his personnel made the mistake in measuring and not me. The following are probably the most critical considerations when purchasing new tires for your coach:
  • Be certain that the intended tire carries an ST rating (Special Trailer).
  • Be certain that the tires selected have the capacity to handle the loaded Gross Weight of your coach.
  • If you are upgrading from a Load Range C to a Load Range D tire, new rims would insure against potential problems with the old rims.
  • Be sure that your dealer includes steel valve stems with your new tires -- rubber stems are marginal at best for the typical inflation pressures required for ST tires.
  • If your dealer must special order either tires or wheels, allow his/her personnel to do the measuring so the proper fitting of the tires/wheels becomes their responsibility.
  • If you have any reason to be suspicious of your dealer, you may want to check the manufacture date of the tires -- there are threads on the Forums with directions for doing this -- I have been doing business with my tire retailer for more than 30 years so haven't felt the need to check this information on the tires that I have purchased.

Good luck with your research!

Kevin
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1964 Overlander International/1999 GMC K2500 Suburban (7400 VORTEC/4.11 Differentials)
1978 Argosy Minuet 6.0 Metre/1975 Cadillac Eldorado Convertible (8.2 Liter V8/2.70 Final Drive)
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Old 07-09-2005, 03:19 PM   #3
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1970 25' Caravanner
Pasco , Washington
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Thanks so much for your help I will pass this info on to my husband. We need tires bad, we just bought this trailer last week and it was a blessing we got it home! It had sat parked for about 14 years. It sits in my driveway as my husband's project and I want to get it going and go camping!
Liz
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Old 07-10-2005, 07:58 PM   #4
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2005 25' Safari
North Las Vegas , United States
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Question

One place that you can check on type of tires is "Tire Rack" here's the web address: http://tirerack.com

You'll see that they are mostly truck and car tires but contact them and they will recommend the best and most affortable tires for our rig.

They have super prices and will answer any and all questions!

Take care,

Rick P
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Old 09-02-2005, 04:25 PM   #5
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1986 34' Limited
Prospect , Tennessee
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Which Goodyear Marathon ST's

I just bought a 1986 Limited with three axles. The tires are old, bias belted and say they are 700-15's. I plan to replace then with the Goodyear Marathon Radials and it was suggested to me by a tire man that the 225/75/15's (D) rated are the closest match. Does anyone know for sure?

Thanks,

Lee Davis

Quote:
Originally Posted by overlander64
Greetings Liz!

Welcome to the Forums!



There are several issues to be considered when choosing tires for your coach. One of the often stated caveats is to avoid changing from a Load Range C to a Load Range D tire unless the rims are also replaced -- the caution has been that change to the higher Load Range tires can cause issues with the existing rim(s). I know that the first time I replaced the tires on my Overlander, I asked my GoodYear dealer to order new trailer rated rims with 2,600 pound capacity as a means of insuring that I had the correct rims as well as providing a good time to switch to Load Range D tires. Basically, I went into my GoodYear dealer and asked that he measure the clearances on the coach as well as the wheels and order the correct tires and wheels; this procedure meant that if either posed a problem with fit when they arrived his personnel made the mistake in measuring and not me. The following are probably the most critical considerations when purchasing new tires for your coach:

  • Be certain that the intended tire carries an ST rating (Special Trailer).
  • Be certain that the tires selected have the capacity to handle the loaded Gross Weight of your coach.
  • If you are upgrading from a Load Range C to a Load Range D tire, new rims would insure against potential problems with the old rims.
  • Be sure that your dealer includes steel valve stems with your new tires -- rubber stems are marginal at best for the typical inflation pressures required for ST tires.
  • If your dealer must special order either tires or wheels, allow his/her personnel to do the measuring so the proper fitting of the tires/wheels becomes their responsibility.
  • If you have any reason to be suspicious of your dealer, you may want to check the manufacture date of the tires -- there are threads on the Forums with directions for doing this -- I have been doing business with my tire retailer for more than 30 years so haven't felt the need to check this information on the tires that I have purchased.
Good luck with your research!

Kevin
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Old 09-02-2005, 05:46 PM   #6
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Colfax , North Carolina
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Quote:
Originally Posted by Lee Davis
I just bought a 1986 Limited with three axles. The tires are old, bias belted and say they are 700-15's. I plan to replace then with the Goodyear Marathon Radials and it was suggested to me by a tire man that the 225/75/15's (D) rated are the closest match. Does anyone know for sure?

Thanks,

Lee Davis
Lee, ST225/75R15D Marathon tires would be fine for your coach. It will also be fine for the Tradewind in the first post in this thread. The issue with rims splitting is not entirely accurate. If you have load range C tires, and you put load range D tires on them, and inflate the D rated tires to their maximum pressurre, you run the risk of the wheel assembly catastrophically coming apart. This is not a "split rim" issue, it is something different entirely.
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Old 09-02-2005, 05:47 PM   #7
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I just bought new tires yesterday from tire rack. They were $ 78.00 each plus shipping for Marathons in the load range D. They also have load range C available, for a few $ less.
I also just bought new alloy wheels from www.trailertiresandwheels.net, and am very pleased with the quality.
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Old 09-02-2005, 05:49 PM   #8
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Quote:
Originally Posted by uwe
I just bought new tires yesterday from tire rack. They were $ 78.00 each plus shipping for Marathons in the load range D. They also have load range C available, for a few $ less.
I also just bought new alloy wheels from www.trailertiresandwheels.net, and am very pleased with the quality.
$78 is not a bad price. I would get the D rated tires, the difference in price is not enough to warrant the lower rated tires. If your coach is supposed to have C rated tires, you can inflate the D rated tires to 50PSI, which should be the C load range maximum pressure. It won't hurt a thing.
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Old 09-02-2005, 08:21 PM   #9
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Lee,

Your are dead on with the ST225/75R15 D Load Range. My friend has a 92 34' coach and he uses this same tire and runs at 55psi on air. This is 10psi lower than Goodyear's spec. but, he figures he gets a little softer ride and less movement of things inside the trailer. Only trade off is a little bit of premature edge wear. He still gets enough miles that the tires age out rather than wear out.

The lower pressure would be good for your old rims.

The st225/75r15 is slightly smaller than an old 700-15 but, less than 1/2 inch on diameter.

Two tires will be 2540lbs x 2 = 5080 per axle (plenty of safety factor)
The axle should be 3400 or 3600 lbs weight rating.
The wheels should be checked. I think they will be 2600lbs. Should be stamped on the wheel.
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Old 09-02-2005, 09:36 PM   #10
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Quote:
Originally Posted by overlander63
$78 is not a bad price. I would get the D rated tires, the difference in price is not enough to warrant the lower rated tires. If your coach is supposed to have C rated tires, you can inflate the D rated tires to 50PSI, which should be the C load range maximum pressure. It won't hurt a thing.
I am usually not much of an online shopper, like to put my eyes and hands on things before plunking down the cash, but every tire store in town was better than $ 100.00 per tire. I mentioned that I'd rather buy local, and quoted the tire rack price, with shipping, but none of them were interested in my business.
I will mount and balance the tires next week, can't wait to see them on the old 63...
The new wheels are super light weight, with hardened inserts for the lugs, and are rated at 2830lbs. I had very goodluck with Marathions on alloy wheels on my previous trailer, a 1971 Tradewind.
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Old 09-03-2005, 05:48 AM   #11
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1993 21' Sovereign
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Quote:
Originally Posted by uwe
I am usually not much of an online shopper, like to put my eyes and hands on things before plunking down the cash, but every tire store in town was better than $ 100.00 per tire. I mentioned that I'd rather buy local, and quoted the tire rack price, with shipping, but none of them were interested in my business.
I will mount and balance the tires next week, can't wait to see them on the old 63...
The new wheels are super light weight, with hardened inserts for the lugs, and are rated at 2830lbs. I had very goodluck with Marathions on alloy wheels on my previous trailer, a 1971 Tradewind.
If you were closer, I would be happy to negotiate a deal with you, based on Tire Rack's price. We have Marathons on our 63 Overlander, and are very satisfied with them.
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