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Old 12-30-2002, 11:07 PM   #1
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Question tire size?

We are planning to move our new 1976 Sovereign Airstream trailer and it needs new tires. We recently realized that our horse trailer has trailer tires that we could perhaps use for the trip, but we're not sure if they'll work. According to the folks we bought the Airstream trailer from, the size of tires on it are 15 in., 7 in., wide 6ply, 235 rim. The Airstream book shows 7.00 x 15, 6 ply tires are appropriate. I've had trouble figuring out what size we need - one tire shop said we didn't have enough numbers. Our horse trailer's tires are ST225/75R15 - will they work? We need to maximize the height of the trailer because we need to use every advantage we can to get the trailer down our long winding, dipping driveway. If the horse trailer tires won't work, any suggestions about what will? The Airstream is apparently about 7100 lbs/31ft long.

Thanks.
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Old 12-31-2002, 05:51 AM   #2
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Tire size?

The tires you mention "may" work as it appears that the ST235/75R15 may have been a stepped up size installed by a previous owner - -based on the information found at:

Vintage Airstream Wheel/Tire/Axle Data

My '64 Overlander has P225 ST/75 R15 load range D Good Year Marathons that have performed to my every expectation. My trailer is somewhat lighter than your '76 Sovereign at 6,100 pounds fully loaded weight. The tires on my Overlander provide about a 20% load carrying margin above the actual weight of the trailer.

The critical dimensions are typically the offset of the wheel involved as well as the dimension of the center cut-out for the axle. Other dimension issues sometimes come into play regarding clearances for width and height, but those issues are more prevalent with the older single axle trailers. You would also want to check the sidewall of the tire involved to be sure that its weight carrying rating is sufficient for the GVWR of your trailer - - or its fully loaded weight.
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Old 12-31-2002, 06:25 AM   #3
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7.00 X 15

I just ordered two 700 x 15 bias ply for my Airstream. I did not opt to go with radials at this time, because two of my tires were manufactured in late 2000, and are in excellent shape. The two I am replacing are 9-10 years old, but still have a lot of tread left, and look excellent, but the age concerns me. The tires are $80 a piece.
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Old 12-31-2002, 09:14 AM   #4
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hey pick

where did you get them?

i have a buddy that may need some also.

john
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Old 01-01-2003, 01:46 PM   #5
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Thanks for the information. I'm a little confused by the load rating. The horse trailer tires are marked load range C, but also say that the max. load is 2150 lbs. I guess I don't understand what the letter means and I'm not sure whether the tires can handle the 7100 lb trailer load or not. It won't be moved loaded with anything - we're planning on living in it during a remodel and then either keeping it for guest quarters or selling it. But first it needs to be driven about 200 miles to reach us.

We're thinking of taking a tire down and giving it a try this week so we can see if the horse trailer tires work and if not, work on plan B - buying new tires so we can move the Airstream next week. If we have to buy new tires, I'm also interested in where you got yours Pick. Thanks.

I've gotta say that it's really great to have this forum - as someone new to Airstreams its especially nice to be able to tap into the knowledge of other folks with more experience.
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Old 01-01-2003, 02:19 PM   #6
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I just went down to the local Firestone dealer. They did not have any in stock, but had to order them. Any tire dealer can get them. But they are on their way out. (Bias Ply) If I still have this beast in 7 years, I swap all 4 out to radials. Mine are Load Range C, and have a rating of 1750 Lbs per tire at 45 PSI. So, 4X will give me 7000 lbs of capacity. The old axles are rated at 3200, and the new ones are 3500, so my tires and axles will be matched perfectly.
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Old 01-02-2003, 01:32 PM   #7
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horse trailer

We have used the tires and rims from our horse trailer on our 23 foot Airstream. The place where we get our tires from said they would work fine (and they have). I need a new rim for the Airstream, and was really excited to find out the horse trailer rims match up exactly! We do keep heavy duty tires on the horse trailer. Our horse trailer is a stock trailer that we haul cattle in as well. We hauled about 9000 pounds of cattle in it this week.
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Old 01-02-2003, 10:27 PM   #8
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Goodgrey

The tires from your horse trailer you say are rated at 2150 #'s. Realize this is at max pressure. If you have two axles or 4 tires then you should be OK. 2150 X 4 = 8600 #'s.

The only thing that may be an issue is the width. Those tires are radials. (That's what the R in the 75R15 stands for) Radial tires tend to squat more than bias ply. And the the 225 is for the width of the tire. That may be too wide. A 205 or a 215 would be a better choice for a permenant tire. However, you are looking for a 200 mile tire and so for a short trip it might work. Just keep 'em fully inflated and check the clearence in the wheel well before you take off.

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Old 01-06-2003, 09:27 PM   #9
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Thank you to everyone! All of your comments were very helpful - enough for us to feel o.k. about taking the plunge. We took our horse trailer tires down to the Airstream trailer and they went on and the trailer was towed without a problem (except for the pouring rain! but it is winter in the Northwest . . .).

Now we have it at an RV service shop and they've raised issues about the furnace and the water heater . . . . On to another thread . . .?
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