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Old 10-10-2006, 11:13 AM   #1
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What is the right size tire?

I recently purchased a 73 27' Overlander and I think that they had the wrong tires on this rig?? Does any one know what is the right size and where did you find this info??

Thanks in advance!
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Old 10-10-2006, 11:55 AM   #2
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OEM is 7.00X15LT, metric replacement is ST225/75R15. The 7.00x15 is direct from the Airstream service manual I have. A forum search will give you more tire info than you could take in at once.
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Old 10-10-2006, 02:11 PM   #3
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I got mine from these guys, Mac's
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Old 10-10-2006, 02:31 PM   #4
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Well, the conversion is what I did not know and I did a search on the Airstream site but, apparently I did not search correctly because I could not find anything, so thank you! Where did you find the conversion? Also, do any of you know what your height of the side walls are from the edge of the rim to the tread?? That is what seems to be too big!

Lipets thanks for the tip from Mac's this will give me a good price reference.
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Old 10-10-2006, 02:35 PM   #5
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What does the P or S or any of the other letters mean when looking on these sites? I know a rookie in charge is dangerous!!
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Old 10-10-2006, 02:56 PM   #6
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The conversion from 7.00x15 to 225/75R15 is far from exact. The metric tire size is too small on the diameter and too wide. The width doesn't seem to cause an issue but the change will drop the trailer by about an inch. You need to look at the specs for static loaded radius (12.7" vs 13.8") not inflated diameter which is what is normally quoted when they search for an "equivalent" metric size. Not only is the 225/75R15 smaller to start with but it bulges way more than the OE tires. 700x15 is still available in both bias ply and radial (7.00X15R) but they're hard to find. Going to a 16" rim increases the number of choices and will allow you to get much closer in size to the original tires.

-Bernie
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Old 10-10-2006, 03:01 PM   #7
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Is there a problem with the 225?? And where should I look for the 7:00x15? I have them on now in a LT but, I know that they are too large of a diameter. When inflated it measures 30" and too tight for the wheel well??
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Old 10-10-2006, 03:31 PM   #8
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A lot of people have replaced the 7.00x15 with 225/7515 without problems. If you've got 7.00x15 tires on there now that's the size the trailer was designed for. As long as you don't mind giving up the ground clearance then "no problem". Other than all the problems associated with today's selection of Special Trailer tires that is; like a 55mph speed rating, no treadwear or traction info, numerous reports of poor quality, etc.
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Old 10-10-2006, 05:12 PM   #9
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Not sure if this is relevant to this discussion, but our 1964 came with original spec tires. Before taking it home we made sure to use standard rims on both sides (one had a split rim) and we then switched to Good Year Marathon 225/75R15 with a load range D.

Only caveat is getting these on and off the trailer. Not sure if the Good Year's are wider than the originals, but it is not as easy as on a new trailer to swap in and out.

Here is the trick I discovered when I rebuilt the bearings on my 64 last week. Jack up the trailer so that the tire has at least 4 inches of ground clearance. Anything less and you'll be in pain. Pulling one off just takes a bit of wiggling. Putting it back on, lean the tire at a 45 degree angle towards the trailer and tuck the top of it underneath the metal. Now comes the gotcha. Do not sit down when you push it in. That is a painful exercise. I did that on the first wheel, just like I do on my 98. Instead, stand up. Grab the wheel from the outside through the center hole with your right hand. Grab the lip of the aluminum by the well with your left hand and pull outwards. Then pull the wheel into the well. Works like a champ!! Just make sure you do not hurt your fingers on the right hand..
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Old 10-10-2006, 05:22 PM   #10
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Quote:
Originally Posted by golddigger
Not sure if the Good Year's are wider than the originals, but it is not as easy as on a new trailer to swap in and out. ..
The 225/75R15 is about 3/4 of an inch wider than the 700X15. I think the difficullty in putting them on is more a styling cue. More enclosed fender skirts were popular back then I think in part because it was considered more streamlined. The smaller diameter should about offset the wider section with the metric sized tires.

You could always flare the fender wells like virtually everyone did with the original Broncos

-Bernie
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Old 10-10-2006, 07:24 PM   #11
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Okay, to answer some of your questions:
P= Passenger tire
ST= Special Trailer tire
LT= Light Truck tire
T= Temporary spare
ST tires are speed rated for 65 mph
LT tires are speed rated for 75 mph
T tires are speed rated for 50 mph
7.00x15 tires are slightly taller and narrower than the metric tires.
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Old 10-10-2006, 08:15 PM   #12
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Quote:
Originally Posted by overlander63
ST tires are speed rated for 65 mph
If the speed limit is 55 the means you can drive 65 right

LT tires I think have a minimum 75mph speed rating. Many exceed this, S rated LT tires are common. It's important to remember that the speed rating is determined by heat disipation. While we may not want to race our Airstreams at Daytona we do have to drive in summer temperatures that exceed the test conditions by a good margin. That 112mph speed rating of an S rated tire may only be marginal when the asphate's hot enough to fry an egg. OK, you do get some slack if the tire pressure is correct and the load is less than the maximum but still...

Here's a couple nice links with tire terminology explained:

http://www.offroaders.com/tech/AT-MT.../tire-tech.htm
http://www.discounttire.com/dtcs/infoTireTerm.dos
http://www.tritontrailers.com/tiresafetyinfo.htm
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Old 10-10-2006, 10:04 PM   #13
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"Too Tight for Wheel Well"

Quote:
Originally Posted by McLogger
Is there a problem with the 225?? And where should I look for the 7:00x15? I have them on now in a LT but, I know that they are too large of a diameter. When inflated it measures 30" and too tight for the wheel well??
I am wondering if you may not have a problem with the axles? I am sure Andy will get in on this thread when he see it. The angle of the spindles may be at a neutral or negative angle and this may explain the why the tire diameter doesn't seem quite right. JMTCW(just my two cents worth)
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Old 10-11-2006, 06:33 AM   #14
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What is a trailer tire?

I have always wondered: what is a trailer tire? What makes it different from, say, a truck tire? Why would I not want to put an LT on a trailer? Could I swap the Good Year Marathon load range D 225/75R15 for 225/75R15 LTs with load range D?
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