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
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Sent:Tue 1/17/06 12:02 PMTo:
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."
overall diameter = 29.4"
max overall width = 7.8" on a 6.0" wide wheel.
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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
XCA 7.00-15 8 ply;
Max width 7.8 on a 6" wheel.
Max OD 29.4 inches.
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.