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Old 07-08-2013, 09:36 PM   #1
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Beware of old ST tires!

SO I'm driving down I-26 heading to Charleston for work when I come upon a Jayco fiver sitting along the road. I pulled over and found the owner removing the right front tire on the Jayco that had blown, the tread ripped off and took out the fender, damaged the undercarriage a bit, and scratched the side of the fiver. They were 15" Denman ST tires made in Mexico. I checked the build date. 4807. The tires were 5 1/2 years old. He said he recently had his mechanic install Nitrogen in all 5 tires. That didn't do much good. He was installing the spare and I stopped him. The tread was split on it. I told him the tires were over 5 years old, he said the tread was still good. I looked at the right rear tire and it was dry cracked and under inflated. He called a tire shop to come out and install a new tire. In the mean time, I went to the next exit and brought him back a business card for a local truck tire shop. Moral of the story. ST tires age. Don't trust them just because they have good tread. Installing Nitrogen in old tires is a waste of money. Find a trust worthy mechanic that would have found the tread splitting in his spare. Properly inflate your tires!!! Not a good way to start a vacation. I hope he and his family have a good time in Charleston, and he gets 4 new tires!
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Old 07-08-2013, 09:44 PM   #2
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I hope he and his family have a good time in Charleston, and he gets 4 new tires!
Amen, and hopefully he doesn't get 4 new tires one at a time!

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Old 07-08-2013, 10:05 PM   #3
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Hey, amxpress - It wasn't this guy, was it??

http://www.forestriverforums.com/for...tml#post417026
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Old 08-01-2013, 10:56 PM   #4
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Just got my trailer last month, the old owner had installed ST tires; had no idea of the danger till today. Had two tires blow out on the curbside. Looked at forums while waiting on the roadside for help to arrive is when I learned about the ST tires. I installed two new LT G rated tires today and will be changed all the others next week. Was a costly lesson today, fender tin damage under the 5er and the rub marks on the side. I wish I knew of this when I got the camper.
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Old 08-02-2013, 08:03 AM   #5
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Just got my trailer last month, the old owner had installed ST tires; had no idea of the danger till today. Had two tires blow out on the curbside. Looked at forums while waiting on the roadside for help to arrive is when I learned about the ST tires. I installed two new LT G rated tires today and will be changed all the others next week. Was a costly lesson today, fender tin damage under the 5er and the rub marks on the side. I wish I knew of this when I got the camper.
I think you missed the point of this thread, the operative word being "old". Your trailer should have ST tires on it. Just not old ones.
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Old 08-02-2013, 08:25 AM   #6
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I think you missed the point of this thread, the operative word being "old". Your trailer should have ST tires on it. Just not old ones.
Truth be told- LT vs. ST tires is a great debate. Most of who I've seen have gone to LT tires have been happy with their decision.

But, you're right- the point of this thread wasn't demonizing ST tires; it was "old" tires (which happened to be ST tires).
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Old 08-02-2013, 08:39 AM   #7
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Truth be told- LT vs. ST tires is a great debate. Most of who I've seen have gone to LT tires have been happy with their decision.

But, you're right- the point of this thread wasn't demonizing ST tires; it was "old" tires (which happened to be ST tires).
Thanks for the correction. I didn't realize there was a controversy over that. It sounds like more research is in order.
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Old 08-02-2013, 08:58 AM   #8
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From what I've read- folks who are against LT tires state the claim that they are designed for the sidewall flexing that occurs with parking maneuvers. Those who are for LT tires claim they're heads and shoulders better above ST tires.

I honestly don't have an opinion...
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Old 08-02-2013, 09:07 AM   #9
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Generally st tires have stiffer side wall construction.
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Old 08-02-2013, 09:15 AM   #10
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and so the reason for the debate continues.

The answer from the RV safety foundation has more to do with the rubber formulation (more internal lubricants in ST vs LT) than anything else.

ST tires are designed from the git go to be installed on trailers. period.
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Old 08-02-2013, 09:15 AM   #11
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I thought there was a difference in the rubber compound. LT get used or driven more, so the composition of the rubber is designed for the. While the ST tires are designed for long periods of sitting.
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Old 08-02-2013, 09:16 AM   #12
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I guess I'd come down on the ST side for two reasons:
1) I've seen the strange contortions my tires go thru in backing turns and can't imagine a normal tire would like that.
2) It's very unusual for RV manufacturers to spend money on something if they can avoid it, such as on more expensive ST tires if they didn't think there was a good reason for it.
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Old 08-02-2013, 09:16 AM   #13
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and so the reason for the debate continues.

The answer from the RV safety foundation has more to do with the rubber formulation (more internal lubricants in ST vs LT) than anything else.

ST tires are designed from the git go to be installed on trailers. period.
That's what I thought too..
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Old 08-02-2013, 10:41 AM   #14
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I thought there was a difference in the rubber compound. LT get used or driven more, so the composition of the rubber is designed for the. While the ST tires are designed for long periods of sitting.
Yes, this is what the RV Safety folks say.
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Old 08-02-2013, 05:35 PM   #15
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I did look up the date code,they were made in 2006
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Old 08-02-2013, 06:01 PM   #16
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I did look up the date code,they were made in 2006
Way too old. Ask Santa (or the Great Pumpkin) for new tires.
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Old 08-02-2013, 06:15 PM   #17
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My source

Unlike the AP; I can name my sources:

Walter C. Cannon
Executive Director
RV Safety & Education Foundation
321-453-7673
Fax 321-453-3853

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Old 08-02-2013, 06:56 PM   #18
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Have you ever wondered why the tire industry seems incapable of making an ST tire that is rated at more than 65 mph?
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Old 08-02-2013, 07:27 PM   #19
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Have you ever wondered why the tire industry seems incapable of making an ST tire that is rated at more than 65 mph?

ST tires are load rated at 65 MPH. It does not mean they are incapable of speeds above 65 MPH; just they won't be able to support the rated load above that speed at that pressure.
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Old 08-02-2013, 09:43 PM   #20
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Have you ever wondered why the tire industry seems incapable of making an ST tire that is rated at more than 65 mph?
Greenball (I think) ST tires are load rated at 75mph.
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