Tires - Page 3 - Fiberglass RV


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Old 05-03-2013, 12:16 PM   #29
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Originally Posted by Carol H View Post
Norm raises a good point regarding tire life. Personal experience with current trailer using a set of LT's and ST's is they have failed long before the tread showed much sign of wear. In both cases there was no blow out - simple tire inspection while getting gas showed they were starting to crack badly between the treads & had I carried on there was a good chance they would come apart very soon. In both cases the tires had been checked by a tire shop prior to the trips and balanced and deemed to be fine. I also do check the air pressure often.

In the case of the LT's they were on the trailer about 4.5 years. In the case of the ST's they were on the trailer 3 years and 3 months. In both cases I was on long trips and the problem was noted in an area with *very* limited options as to what they could be replaced with - one tire shop towns and the next town a great distance away. So no option but to take what they had on the shelf, not possible to choose a different brand/type.

In both cases the tire shops that did the change overs suggested that one should not expect a tire trailer to last nearly as long as a car tire for the simple reason trailers tend to sit for much longer periods of time than car tires. If sitting out in the sun in one spot they will be subjected to a higher amount of UV damage in the spot the sun is continually hitting - which was the case for the LT tires that were on the trailer when I purchased it - the trailer had been sitting for 2 years or more in the Idaho sun with very little use. Another cause I was told that if sitting in a damp climate in one spot they will start to root out from the inside. I live on the wet coast so that may have been part of the issue with the ST's that replaced the LT's.

Based on the above I personally I am not going to leave a set of tires on my trailer any longer than 4 years and will start shop around at home where I have more options as to what to replace them with once they hit 3 years of age regardless of how good they look.

Thats just been my experience with tires in recent years and I am not a tire expert. I know there are people here who have gotten a lot more years out of their trailer tires and lots of suggestion as to why.
Carol,
I am curious, what were the LT tires you had ? It's generally hard to find LT tires in diameters smaller than 16" in the US market. Kumho, Hankook and couple of others are available, but they can be hard to locate.

george
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Old 05-03-2013, 12:31 PM   #30
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LT Tires

Under FAQ/Technical Goodyesr has a statement about the difference between LT tires and ST tires.

Goodyear RV Tires
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Old 05-03-2013, 12:41 PM   #31
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Originally Posted by Brian B-P View Post
What the first item tells me is that I should not take the second item seriously.
You lost me Brian, I don't initially see any corelation.

Now cany anybody explain what the difference is when it comes to ST and LT tires? I don't mean LT for light truck either. Knowing this might make some of the other comments make more sense.
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Old 05-03-2013, 01:30 PM   #32
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Originally Posted by Jon Vermilye View Post

Well, the trailer now has a set of Maxxis D rated ST205/75/15 tires

What did the tire guys say about the wear pattern on the old tires? (picture from this thread you posted about them).

Did they have any concerns re. camber/toe in etc?

Francesca

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Old 05-03-2013, 01:42 PM   #33
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Originally Posted by honda03842 View Post
Under FAQ/Technical Goodyesr has a statement about the difference between LT tires and ST tires.

Goodyear RV Tires
This is what is said there without going looking. This advise seems sound to me, and is what I would do because it works.

_____________________________________________

What is the difference in a trailer specific tire and regular passenger tire?

Trailer tires are considered a special category in the current global design standards of Tire and Rim. The major difference is that trailer tires are required to carry 10% more load than an equivalent P-metric size tire. LT type tires are actually on a lower formula and would require a significant size or load change to meet the trailer load requirements.

In the design process, we evaluate what works best under trailer applications/conditions. We typically find that a narrower tread width and a shallower non-skid (tread depth) provides a better overall performance in a free rolling position. This is one case where wider is not better. There are significant design differences with these tires and this explains why trailer tires are in a special category. In addition, that is why we recommend using trailer designed or trailer specific tires in trailer towable applications.
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Old 05-03-2013, 01:46 PM   #34
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I do have to wonder, would car tires have the same 5 year recommended life too. I don't think I have ever had a vehicle that went more than 2 or 3 years without requiring the tires to be changed.
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Old 05-03-2013, 02:01 PM   #35
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Originally Posted by Jim Bennett View Post
(quoting Goodyear)
We typically find that a narrower tread width and a shallower non-skid (tread depth) provides a better overall performance in a free rolling position. This is one case where wider is not better. There are significant design differences with these tires and this explains why trailer tires are in a special category. In addition, that is why we recommend using trailer designed or trailer specific tires in trailer towable applications.
__________________________________________
Of interest may be the fact that these same principles govern the design/selection of tires put on big long haul trucks. That industry has spent many dollars researching this question, particularly as it relates to fuel economy. Tires for semitrailers are designed by very similar parameters as ST's.

Here's a link to a tire selector for big truck/trailer tires- note that wheel position is the second question asked. Tire selector

Francesca
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Old 05-03-2013, 02:51 PM   #36
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Originally Posted by Francesca Knowles View Post
What did the tire guys say about the wear pattern on the old tires? (picture from this thread you posted about them).

Did they have any concerns re. camber/toe in etc?

Francesca

Well, according to both the trailer shop & the tire shop, the wear was normal for a torsion axle, although might show some signs of slight under inflation. I'm not going to argue with them, but every under inflated tire I've ever seen shows wear on both the inside & outside, not just the outside. They are a shop that services many torsion axle trailers. They were surprised that 2 year old tires were worn out until I mentioned that they had around 33,000 miles on them.

I am going to try running the Maxxis 8008 tires at sidewall pressure & see what happens...
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Old 05-03-2013, 02:56 PM   #37
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Interesting...

Well, they're the experts!

My torsion-equipped Trillium's on its third set since I bought it and wear has been pretty even...but I have replaced them much sooner, based on age/miles rather than visual wear so maybe that's why.

Francesca
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Old 05-03-2013, 03:37 PM   #38
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Originally Posted by Jim Bennett View Post
Trailer tires are considered a special category in the current global design standards of Tire and Rim. The major difference is that trailer tires are required to carry 10% more load than an equivalent P-metric size tire. LT type tires are actually on a lower formula and would require a significant size or load change to meet the trailer load requirements.
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Wow!
Thanks for quoting that Jim.

Who would think that? I assumed that by buying trailer tires for my trailer I'd have something better suited than car tires.

Requires a signifant size or load change. Shoot.
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Old 05-03-2013, 03:49 PM   #39
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OK, from the same link I posted before, I see an explanation.
http://www.carlisletransportationpro..._Practices.pdf

– An "LT" designation, when shown on a trailer tire size specifies load
range only, it is not designed for use on light trucks.
– ST tires generally offer approximately 10% percent more load
capacity than a similar LT tire and nearly 40% more than a P
passenger tire.

What I don't know in the last quote is where the LT refers to truck tires or trailer tires.
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Old 05-03-2013, 03:52 PM   #40
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Originally Posted by Roy in TO View Post
I assumed that by buying trailer tires for my trailer I'd have something better suited than car tires.

.
You would.

And better suited than LT tires, too. Since they form an integral part of vehicle suspension, LT's design parameters include an important component for passenger comfort, just like P-tires. Softer ride doesn't equate to better performance on a trailer.

Francesca
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Old 05-03-2013, 04:11 PM   #41
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Originally Posted by gmw photos View Post
Carol,
I am curious, what were the LT tires you had ? It's generally hard to find LT tires in diameters smaller than 16" in the US market. Kumho, Hankook and couple of others are available, but they can be hard to locate.

george
George the LT's were Kumho's and where purchased in the the US by the previous owner.
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Old 05-03-2013, 04:52 PM   #42
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Since tire inflation pressure is specified, on the Trillium data sheets, at 28psi. I wonder what has changed between now, and then.

There have been several comments about this on this thread:
Serial numbers on a Trillium
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