About ST Tires - Fiberglass RV


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Old 11-03-2013, 12:13 PM   #1
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About ST Tires

Moderator: Should this be made into a sticky?

Here's a fairly decent looking explanation about ST tires:

http://www.google.com/url?sa=t&rct=j...,d.cGE&cad=rjt
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Old 11-03-2013, 12:57 PM   #2
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Thanks Bob. Many could pick up a lot from this. Part of being careful, knowing that heat is a tire destroyer, we try to start and and our travels before the heat of the day.
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Old 11-03-2013, 05:46 PM   #3
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Bob...thanks for the information. We purchased our Casita three years ago , used, and the tires still appear to be in good condition. I'm not sure when the tires we're put on the trailer. I'm assuming about one year before we purchased it. If that is the chase then my tires are four years old and I plane to replace then before the start of next camping season. The information you provided is very useful, leaving only two questions. What brand of tires meats all the standards required? Which brand is the best? Thanks TomB
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Old 11-03-2013, 11:05 PM   #4
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Very Good. Thanks for posting this.
It appears that Carlisle has stated information in a much more clear manner. I noted that ST tire pressures are listed on sized vs maximum load as a pressure rather than a chart of pressures. I also noticed that they state clearly "Maintain tire pressure at the maximum PSI recommended on the sidewall"

Guess I'll have to look at Goodyear and see if they clearified things bit.
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Old 11-04-2013, 06:23 AM   #5
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In my earlier days I worked for two major tire companies. By far we had a much higher failure/return rate with the ST tires than P or truck tires.

Wondering if folks followed the tire care guidelines as outlined in the article if the tires would stand up better???
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Old 11-04-2013, 07:00 AM   #6
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Although we've seen this article before, I'm still confused by the LT designation on trailer tires.
I quote:
An "LT" designation, when shown on a trailer tire size specifies load

range only, it is not designed for use on light trucks.
and
ST tires are branded with a load range (LRB, LRC, LRD, LRE and LRF)
on the sidewall, listing load range letters in the sidewall description.

For example, ST205/75R15LRD.

Can anybody explain this further?

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Old 11-04-2013, 07:48 AM   #7
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Roy, I'm reading the statement as saying if there is also an LT in a trailer tire's size designation it means load range. I've searched Tire and Rim and ETRTO (European) standards and can't find any precedent. Maybe it's in the Japan code but I can't find them at the moment.
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Old 11-04-2013, 10:32 AM   #8
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Quote:
Originally Posted by MC1 View Post
In my earlier days I worked for two major tire companies. By far we had a much higher failure/return rate with the ST tires than P or truck tires.
Its been explained to me by more than a few tire shops that its due to the usage of the tire not the tire itself.

ST tires are mounted on trailers that are often parked for long periods of time either in the hot sun (Ultraviolet rays weakens the rubber) or parted in a wet environment (rot from the inside).

Truck tires mounted on trucks which are normally used far more frequently avoiding the above issues.
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Old 11-04-2013, 12:11 PM   #9
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Quote:
Originally Posted by Steve L. View Post
Roy, I'm reading the statement as saying if there is also an LT in a trailer tire's size designation it means load range. I've searched Tire and Rim and ETRTO (European) standards and can't find any precedent. Maybe it's in the Japan code but I can't find them at the moment.

I believe it's mentioned someplace else on the Carlise Web site. There's some tire charts with tire size numbers. I think I saw LT in there.
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Old 11-04-2013, 12:14 PM   #10
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Quote:
Originally Posted by Carol H View Post
Its been explained to me by more than a few tire shops that its due to the usage of the tire not the tire itself.

ST tires are mounted on trailers that are often parked for long periods of time either in the hot sun (Ultraviolet rays weakens the rubber) or parted in a wet environment (rot from the inside).

Truck tires mounted on trucks which are normally used far more frequently avoiding the above issues.
Vehicle tires will have the tread worn and will be replaced usually in less than 5 years. Trailer tires will show little if any tread wear in the same length of time. I replaced mine after 5 years and they looked new. Too many people judge the health of a tire by the amount of tread left.
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Old 11-04-2013, 12:49 PM   #11
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Okay, I just went out and wrote down numbers from my tires. I've never been able to figure out this age thing and I still can't. These tires were installed in 2007- that I know for a fact. I don't remember having to replace any of them though I did have a leak repaired so it is possible I'm forgetting doing that.

I can find two four digit numbers. 3209E (after DOT X20B) and 232 1 after HF (or HP.)

Which, if either of these, is related to tire age?
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Old 11-04-2013, 12:50 PM   #12
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Goodyear Marathon have a 6 year limited warranty. Replacing at five years might be premature.
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Old 11-04-2013, 01:23 PM   #13
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Quote:
Originally Posted by Bobbie Mayer View Post
...Which, if either of these, is related to tire age?
The last 4 numbers of the string that follows DOT. WWYY (WW =week of the YY =the year. 1307= thirteenth week of 2007.

Or in the picture: 42nd week of 2002
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Old 11-04-2013, 01:46 PM   #14
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So maybe I did replace that one tire. I guess I need to check the other one to see how old it is. Has to be at least 07.
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