Another Tire Question - Fiberglass RV


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Old 01-11-2013, 02:59 PM   #1
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Another Tire Question

Well, I've managed to wear out a set of tires on my single axel Escape 17B (33,000 miles, so I guess I can't complain). Anyway, the original tires are ST 205/75/15 Goodyear Marathons, "C" range. My rims are rated at 50 PSI, my trailer's maximum loaded weight is around 3025 lbs, with a maximum axle weight of 2820 lbs with the WDH.

I'd like to replace the tires with Maxxis 8008 ST tires since the wear on the Goodyear tires was a bit strange. The tires are almost bald on one side with plenty of tread 180 from the worn side (not edge to edge, but around the perimeter). The Maxxis tires are available as either "C" or "D" rated.

And finally, the question - Since my rims limit me to 50 PSI, and my axle weight is well under the tire pressure for the rims, is there any advantage to going to a "D" rated tire since I can't inflate more than 50 PSI?
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Old 01-11-2013, 03:35 PM   #2
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Quote:
Originally Posted by Jon Vermilye View Post

I'd like to replace the tires with Maxxis 8008 ST tires since the wear on the Goodyear tires was a bit strange. The tires are almost bald on one side with plenty of tread 180 from the worn side (not edge to edge, but around the perimeter).
Maxxis are great tires, but:

The wear pattern you describe above sounds more like a sign of either an alignment/balance or axle problem than it does an indicator of tire quality. You might want to ask the opinion of a professional tire outfit in case it's a condition that needs correction.

Here's a chart about tire wear:



Good luck!

Francesca
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Old 01-11-2013, 03:56 PM   #3
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The wear pattern doesn't fit any of those examples, or any others I've been able to find - I've asked but all I get is shrugs.
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Old 01-11-2013, 04:08 PM   #4
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Can you post a picture of the tires?

I will say, however, that I think you've gotten an extraordinarily long life from your ST's- from what I've been told, even 20,000 miles is considered a good return in that department!



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Old 01-11-2013, 04:16 PM   #5
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If I had to guess you are suffering from a very badly balanced tire, but I am no expert, and that is just a shot in the dark.
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Old 01-11-2013, 04:26 PM   #6
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Could be, but they were balanced at Escape, and I would have expected to be able to feel the tire hopping if it was that bad, although maybe not...

As to photos, I can probably do that after Sunday - they are under snow, but we are expecting a 50 day by then so maybe I can get to them.
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Old 01-11-2013, 05:42 PM   #7
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Odd tire wear

I had odd tire wear on the driver's side tire. The inside of the tire was worn almost to the belts in a spot but it was only noticeably worn on about 180 degrees of the tire.

The bearings had been repacked just before we bought the trailer. It appears that the nut holding the bearings in was not properly tightened allowing the wheel to wobble.

I discovered what I think was the problem by jacking one side of the trailer up and could move the edges of that tire in and out. I replaced the tire, repacked the bearing and no more in/out motion at the edges of the tire.
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Old 01-11-2013, 10:36 PM   #8
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Quote:
Originally Posted by Francesca Knowles View Post
I will say, however, that I think you've gotten an extraordinarily long life from your ST's- from what I've been told, even 20,000 miles is considered a good return in that department!
Not sure that Jon's tires have had all that long of life. Mileage wise yes but age wise no. He will have to confirm it but I seem to recall he only got the trailer about 2 years ago??? could be wrong as time does fly. Either way your right good miles, I would be happy to get those types of miles out of an ST tire.... sadly its my experience that age gets to my ST tires life span before the mileage wear does.
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Old 01-12-2013, 05:09 PM   #9
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Quote:
Originally Posted by Jon Vermilye View Post

As to photos, I can probably do that after Sunday - they are under snow, but we are expecting a 50 day by then so maybe I can get to them.
I hope you do- I'd really like to see the wear! Do I understand correctly that it's the same on both tires, and only on the outside edge?

Quote:
Originally Posted by Jon Vermilye View Post
I'd like to replace the tires with Maxxis 8008 ST tires ......And finally, the question - Since my rims limit me to 50 PSI, and my axle weight is well under the tire pressure for the rims, is there any advantage to going to a "D" rated tire since I can't inflate more than 50 PSI?
For myself, I'd be reluctant to take a chance that someone would unwittingly inflate the tire to the maximum allowed on the sidewall, especially since it appears to be little known that rims have any PSI limits at all. Most folks just read the tire...

Also, when looking at Maxxis' chart at this link, it looks to me like there's nothing to gain by such an upfit- you get the same load carrying capacity at your 50 pound wheel limit, so no "redundancy" is achieved. And I could be wrong about this, but it's my understanding that the load ranges are indicators of sidewall strength but that there's no upsizing in tread thickness, if you're thinking of some gain in that department.

Per tire life:

As I said, yours served you very well...here's Maxxis' own much-quoted take on trailer tire life:
Quote:
“The life of a trailer tire is limited by time and duty cycles,” Maxxis says. “Industry standards suggest that trailer tires should be replaced after three to four years of service regardless of tread depth or tire appearance. On average, the mileage expectation of a trailer tire is typically between 5,000 to 12,000 miles.”
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Old 01-12-2013, 11:01 PM   #10
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flat spotted tire, grabby brakes perhaps?
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Old 01-13-2013, 12:32 PM   #11
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I did get out to photograph the tires. First I'll answer a couple of questions: They are 2 years old.
I don't think it is grabby brakes - I drive lots of gravel & dirt roads & didn't have a problem with them locking up.

The wear is on the outsides of both driver & passenger sides, although worse on the passenger side. The most worn area is at the bottom & I'm not jacking up the trailer to spin the tires! I will take better photographs and add them in the spring after the new tires are mounted for anyone interested. Again, I'm happy with the 33,000 miles I got out of the tires.

My original question was (and still is) is there any advantage to a "D" rated tire over a "C" rated tire if you are only going to inflate them to 50 PSI? I agree with Francesca that it is a bad idea to stick a tire with a stamped pressure rating of 90 PSI on a rim rated for 50 PSI unless there is an advantage to the heavier & more expensive tire.

There are more photos at 2012 Trip, Day 1 & Index, including some full size (4256  2832) jpgs that are around 7-8MB each.
Attached Thumbnails
ASF_8281.jpg   ASF_8262.jpg  

ASF_8265.jpg  
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Old 01-13-2013, 12:51 PM   #12
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It sure looks like the load is riding the outside edge of the tire- even distribution should result in more even wear.

The pictures at least do seem similar to the "camber/toe" tire in the chart I posted earlier...since it's on both sides though a bit worse on one, my at-a-distance suspicion is that it may be related to the axle.

I guess one way to find out is to just put the Maxxis on and watch for wear patterns.

Per Maxxis replacement:

You mention "90 psi"- how big a tire will the trailer wheels hold? I didn't see any psi's higher than 65 in what I understood to be your stock size...( Maxxis Chart)

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Old 01-13-2013, 01:08 PM   #13
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If those tires were on my automobile, I'd say you had an alignment issue, camber or toe/in out issues causing the chamfer on the edges. Are Dexter axles adjustable? I do not think we ever got any info on our axles from Escape?
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Old 01-13-2013, 01:28 PM   #14
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It's my understanding that most torsion axles can't be adjusted after installation. There are some exceptions but I don't know the axle brand used here...

The funny thing is that both-sides edge wear on trailers with torsion axles is more often seen on the inside edge, and often means that the axle is overloaded. link

Don't torsion axles work partly by way of themselves flexing under the load?

It's almost as if what we see here is the opposite of overloading...as if the load isn't heavy enough to "flex" the torsion axle and level the tire.

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