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Old 06-28-2014, 10:54 PM   #1
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Join Date: Nov 2013
Location: Terry, MS
Posts: 66
1988 E350 tire size on Holiday Rambler Class C

Well I took a short camping trip today. I had a blowout on the interstate (left outer). I limped to the next exit and changed the tire. I went about two more miles and blew the Right outer. Again I limped to the next exit which is a spot truckers stop for the night. I took the right outer off but decided not to try a few more miles because I'm sure the single tire on the rear wouldn't last. I left it at the lot on the side of the highway for the night.The tires are P215/85R16. I can't find any. The only store open tomorrow is WalMart. They have a P235/85R16 which is a good bit taller and they have a P245/75R16 which is almost the same size except it is about 1" wider. Will it work on the duals without rubbing? I need to get it off the highway tomorrow if possible. I can't wait to order tires. What's my best bet on size? If I get it home I'll replace the inner tires too. The tires looked great and didn't have dry rot but they were older. I have new ones on the front which are P215/85R16.
Stranded on the highway

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Old 06-29-2014, 12:11 AM   #2
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Location: Klamath County, Oregon
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P-metric tires are passenger car tires. They should NOT be used on a motorhome. They are not made to handle those kinds of loads. What load rating are they? Instead of a load range letter, on the sidewall you will find two or three numbers followed by a letter, i.e. 98T. You should absolutely be using light truck (LT) tires.

Whoever put P tires on your motorhome was obviously trying to buy tires on the cheap. You were wise not to try driving with only a single rear tire. What really surprises me is that anyone even makes an 85 series P tire. That is an aspect ratio usually used only for truck tires. The closest I'm aware of is 80 series, and those are very unusual.

LT235/85R16 load range E is probably the most common tire size for that size chassis. Your RV very likely came new with either LT235/85R16s or 7.50-16s. A 245/75 will probably not work in the dual positions. The sidewalls will rub, leading to tire failure.

I would strongly recommend getting those passenger car tires off as soon as possible. The next time one fails you may not be so lucky. In the meantime, make sure they are inflated to the highest pressure you can safely use.


Jim Price
curmudgeon: noun; a crusty, ill-tempered, irascible, cantankerous old person . . . .
79 27' Holiday Rambler Statesman, 78 32' HR Imperial, 85 36' HR Imperial 5th Wheel
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Old 06-29-2014, 07:44 AM   #3
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Location: Terry, MS
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oops. It is LT21585R16 tires on it I just typed it wrong. I found a Firestone store open and they have the industrial transforce tires in that size. They are mounting them now. Thanks for the response.
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