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Old 03-03-2008, 04:08 PM   #1
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16" tires on a 31' Sovereign

I am following up on a possible change in wheels and tire size on my 1976 31'sovereign. Thanks to "Beginner" for giving me some details on the BF Goodrich LT Commercial T/A 225/75 16" load range D tire and the eagle alloy wheels that he is using on his 1984 A/S. Has anyone switched to the 16" wheels and tires on a 76 or mid 70's A/S. Is there any problems with the slightly larger tire fitting in the wheel well without rubbing.

Thanks Don
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Old 03-03-2008, 04:16 PM   #2
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Quote:
Originally Posted by adonh
I am following up on a possible change in wheels and tire size on my 1976 31'sovereign. Thanks to "Beginner" for giving me some details on the BF Goodrich LT Commercial T/A 225/75 16" load range D tire and the eagle alloy wheels that he is using on his 1984 A/S. Has anyone switched to the 16" wheels and tires on a 76 or mid 70's A/S. Is there any problems with the slightly larger tire fitting in the wheel well without rubbing.

Thanks Don
Your proposal, depends alot on the condition of the axles.

If the axles are borderline or close to it, then when you hit a bump, the top of the tires will hit the wheel well cover.

If your covers are metal, you cut into the tires.

If your covers are plastic, you can easily start a fire.

Andy
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Old 03-03-2008, 06:01 PM   #3
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If you have more than 1/2" clearance with the currnet tires, the new ones should clear, being only 1/2" larger in the radius (if your current ones are also 225's). It's tough to check the upper clearance but you might try backing one tire onto a ramp untill the other is off the ground, then see how close it is to the top of the wheel wells. Other Forum members have done the 16" swap.
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Old 03-03-2008, 07:27 PM   #4
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Your '76 originally came with 700-15 tires which had a diameter of 29.2 " , your proposed tires have a diameter of 29.4 " . Unless something is drastically wrong with the running gear 2 tenths of an inch should not be a problem.
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Old 03-03-2008, 09:14 PM   #5
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Tire Size

According to the shop manual for my 1984 31 Foot Excella the original tire was a Michelin XCA 7.00-15 8 ply (Load Range D). This tire was a radial. I have two that I bought off another member of our unit for measurement verification purposes.
The following is a reply from Michelin answering the question; what was the outside diameter of the Michelin XCA 7.00-15 8 ply.

Reply From Consumer Relations‏From:Webtire, Michelin (michelin.webtire@us.michelin.com)You may not know this sender.Mark as safe|Mark as unsafeSent:Tue 1/17/06 12:02 PMTo:

Beginner:

Thank you for visiting our Web site and sending us your e-mail.

In response to your inquiry:

"Once upon a time you made the XCA in the 700-15 load range D. I need to
know a couple of things about the tire. First what was the outside diameter
and Max width of the tire."

_________________________________________________


7.00R15 XCA

overall diameter = 29.4"

max overall width = 7.8" on a 6.0" wide wheel.

Please take a moment to respond to a short survey that will
assist us in providing better service to you.

Paste the line below into your browser:

http://www.asurvey.net/michelin/?34.33333.12


If you have additional questions, please respond to this email
or you may call us at 1-800-847-3435 (toll-free) between
8:30AM and 6:00PM Eastern Time Monday through Friday to allow
one of our Consumer Relations Representatives to assist you.

Michelin North America
Consumer Relations Department

(Please Do Not Delete the line below.)
Email ID: 1512781

The Max Outside Diameter (OD) of the B. F. Goodrich Commercial T/A is 29.4 inches as can be verified at this website:
BFGoodrich Tires | Commercial T/A® All Season | Tire Sizes & Specs

The Width of the BFG Commercial T/A is 8.8 on a 6 inch wide rim.

The Goodyear marathons width is 8.7 inches which can be verified at this web site:http://www.goodyear.com/rv/pdf/rvbrochure.pdf

To summerize:
XCA 7.00-15 8 ply;
Max width 7.8 on a 6" wheel.
Max OD 29.4 inches.

Goodyear Marathon:
Max width 8.7 inches on a 6 inch wheel.
Max OD 28.3 inches.

B. F. Goodrich Commercial T/A.Max width 8.8 on a 6 inch wheel.
Max OD 29.4 inches.

If the Commercial T/A will hit the inner fender then the original tire that Airstream put on your trailer and mine will hit the inner fender.
I don't think so.
All I have done is return to the original tire that Airstream put on my trailer in the first place.
Any more questions, feel free to ask.

Beginner
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Old 03-04-2008, 11:34 AM   #6
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Thanks for the input.
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Old 03-04-2008, 12:03 PM   #7
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Hi Adonh!

There are many, many threads on tires.
There are also many closet Airstreamers who have gone over to 16" rims and LT tires.

On my 1995 Excella, I myself have switched to 16" steel rims and Michelin XPS tires (load range D). and know many who have.

The rims were ordered from Discount tire. Standard 16" 5 bolt trailer rims with a 0 offset.

They fit fine, even with my Centramatics in place.

Note, each Airstream wheel-well cutout is a little different, depending on the day of the week

A little cutting and readjusting of the wheel-well trim
gave me more clearance than the original setup.

Best,
Michael
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Old 03-04-2008, 03:40 PM   #8
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Quote:
Originally Posted by ArtStream

The rims were ordered from Discount tire. Standard 16" 5 bolt trailer rims with a 0 offset.
CORRECTION
the above should read
Standard 16" 6 bolt trailer rims with 0 offset

Thanks to Beginner for the heads-up

Michael
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Old 03-04-2008, 06:42 PM   #9
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Reday to make a decission

Ok I am down to 2 possible tire /wheel options.

Option 1- Is the 16" BF Goodrich commerical TA tire and the Eagle alloy rims that Beginner posted. these are good looking tires and rims.

BF Goodrich tire maybe just a little over $100 and the whels around $95


Option 2 - Is the Maxis ST225/75R15 load range D tires and the wheels below:

Maxxis.com

http://www.trailertiresandwheels.com...product/AW1507

Another goodlooking tire and wheel.

Price of the Maxis at Discount tire is right at 4100 mounted and the wheels are around $85.

So price is not the big deciding factor. Thanks for all of the input and now I will sleep on it.

Don
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Old 03-05-2008, 11:23 PM   #10
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i've been searching through the forum looking for replacement tires. Having selected the Goodyear commercial ta 225/75 16's load range D I tried to source a set and couldn't find them. I got this response from Michelin "Thank you for your interest in BFGoodrich tires and for sending us your
email. We appreciate the opportunity to serve you.

Unfortunately, the load range D has been discontinued and no longer
available. However, the load range E LT225/75R16 Commercial T/A is
available."

Back to the search I guess.
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Old 03-16-2008, 05:29 PM   #11
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That's correct, the BF Goodrich Commercial T/A LT 225/75R 16/D has been discontinued. I was all set to get these tires for my 1976 31' Sovereign. Here is a Uniroyal Commercial LT 225/75R 16/D tire that seems to have the same specs as the Goodrich tire. What about these?

Thanks Don

Uniroyal | Laredo HD/H | Tire Sizes & Specs
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