Goodyear Marathon - Fiberglass RV


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Old 08-16-2007, 03:25 PM   #1
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I have been having a difficult time finding replacement tires, I bought new Goodyear Marathon tires 2 years ago and have already worn out 2 of them in about 7500km. I think I need a new axle which I am looking into for a winter project or next spring. For now, I am going on a 3 week vacation, Goodyear has no tires with no production date and the dealer told me they were most likely discontinueing this tire. I was able to nab 2 tires for a decent price at an independent seller, but for the future, what other tires are available? Is the 4 ply 1100# rated tires ok for a 13" Scamp, or is my Goodyear Tire dealer messing with me? Shopping around has only yeilded Carlisle tires, pre-mounted to a 5 bolt pattern rim with only 1 seller willing to do a rim swap leaving me with a rim I don't need. This also has me a little concerned in a worst case senario of 2 flats and not finding a replacement tire that will fit to get me home.

edit:typo in topic description corrected
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Old 08-16-2007, 03:58 PM   #2
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Shawn,
If you want to change to a different tire, when I had my Boler I took it into the local Kal Tire and they put new tires on the existing rims, Maxxis ST 8008 They had them in stock when I just dropped in with the trailer in tow. Not sure if that helps at all, or if you are even close to a Kal Tire shop, but they were good tires and weren't premounted on rims.
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Old 08-16-2007, 04:01 PM   #3
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Does anyone know what was available for the Goodyear Marathon ST175/80/13 tires? My dealer told me that the 6 ply was going to be discontinued, I just looked at my tires and they are the 4 ply tire rated for 1360#, what is the 6 ply rated for? How many ply is the 1100# rated tire. I think I am being put through some undue stress here and I even went in with a tire for replacement Canadian Tire was even more useless and the parts guy was rude. Costco seems to be the most helpful and best price so far.
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Old 08-16-2007, 04:10 PM   #4
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Shawn,
If you want to change to a different tire, when I had my Boler I took it into the local Kal Tire and they put new tires on the existing rims, Maxxis ST 8008 They had them in stock when I just dropped in with the trailer in tow. Not sure if that helps at all, or if you are even close to a Kal Tire shop, but they were good tires and weren't premounted on rims.
The closest in Quebec is 3-4 hours away from Montreal in of all places, Rouyn-Noranda, odd, the only one in Quebec also. I find living in the second largest city in Eastern Canada, there is nothing here for specialty stuff, even going home to NB to find things, its difficult here for some reason . There is one in Ottawa about an hour and half away from the house (we work in Montreal 45min in the opposite direction) with weekend hours, we camp up there once in awhile so might look into them, thanks.
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Old 08-16-2007, 05:24 PM   #5
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These Goodyear Marathon Trailer tires are still showing in at Tire Rack.

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Old 08-16-2007, 06:14 PM   #6
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The ply rating is the old system, from when they actually counted the plies. The current system uses Load Range, which should also be on your tires.

I've never used them, but the Casita forums are reportedly quite enthused over Kuhmo tires and other folks like Towmaster (I think they may come on Scamps now). There are plenty of other Load Range C tires out there.
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Old 08-16-2007, 07:09 PM   #7
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I recently put on a pair of Duro tires. Maybe they have something in the size you need.
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Old 08-16-2007, 07:35 PM   #8
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Quote:
The ply rating is the old system.
The current system uses Load Range.

... and other folks like Towmaster (I think they may come on Scamps now). There are plenty of other Load Range C tires out there.
I am presently running 5.30 x 12, 6 ply radial, load range C, Towmaster tires on my Fiber Stream.
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Old 08-16-2007, 08:14 PM   #9
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As Pete said, ply ratings are like, so yesterday. Seriously, there are a bunch of ways to describe the range of load capacity, but they all tie together in a consistent way:
  • "2 ply rating" - 24 PSI max inflation pressure - Load Range A (won't find any of these anymore)
  • "4 ply rating" - 35 PSI max inflation pressure - Load Range B (comparable to common passenger car tires)
  • "6 ply rating" - 50 PSI max inflation pressure - Load Range C (common on small travel trailers)
  • "8 ply rating" - 65 PSI max inflation pressure - Load Range D (common on bigger travel trailers)
  • "10 ply rating" - 80 PSI max inflation pressure - Load Range E
  • ... and so on
As you can tell from the list, tires used to have a lot of layers ("plies") of reinforcing cord in them. A modern passenger car tire, with the inflation pressure and approximate capacity of the Load Range B trailer tire, has only one body ply (plus an extra belt or two under the tread). I have no idea how many are really in current trailer tires, but it should be shown on the sidewall... not that is matters.

It might help to have a look at the full Marathon Specifications. For the ST175/80R13, 1100 lb capacity would be the Load Range B, while 1360 lb would be Load Range C. A "four ply" rated for 1360 lb might be a misunderstanding, or perhaps a tire with four actual plies but capacity to handle 50 PSI and Load Range C ("six ply rating").

As is apparent in a quick comparison of the Marathon and full Maxxis M8008 ST Radial Specifications Table, tires of the same type (e.g. ST), size, and load range from different manufacturers have the same load rating. They may perform differently and have different levels of quality, but the rated capacity is consistent.
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Old 08-16-2007, 08:24 PM   #10
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To more directly respond to the original question...

The title says "Goodyear Marathon, To discontinue the ST175/85/13 6 ply tire?". The likely size for a Marathon is actually ST175/80R13 (I assume just a minor typo), but perhaps some retailers are actually looking for the wrong size.

If Goodyear were to discontinue one load range in this size, it would be hard to imagine them dropping the Load Range C version (the "six ply rated" one), since a Load Range C tire could be sold to replace Load Range B tires, but not the other way around. I doubt many trailers now use a ST175/80R13 LR-B, since even a trailer maker trying to be as cheap as possible would likely choose a 12" load range D tire instead (for the same load). In larger sizes, only higher load ranges are available.
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Old 08-16-2007, 09:20 PM   #11
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I doubt many trailers now use a ST175/80R13 LR-B, since even a trailer maker trying to be as cheap as possible would likely choose a 12" load range D tire instead (for the same load). In larger sizes, only higher load ranges are available.
I believe Scamp is still using load range B on the 13'. My 2006 has LR-Bs.
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Old 08-16-2007, 10:55 PM   #12
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Tirerack used to sell Goodyear Marathons ST175/70/13 in both B and C load ratings. Now they seem to only have C rated. Perhaps that is the tire that is no longer being made.
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Old 08-17-2007, 09:00 AM   #13
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Quote:
To more directly respond to the original question...

The title says "Goodyear Marathon, To discontinue the ST175/85/13 6 ply tire?". The likely size for a Marathon is actually ST175/[b]80R13 (I assume just a minor typo), but perhaps some retailers are actually looking for the wrong size.

If Goodyear were to discontinue one load range in this size, it would be hard to imagine them dropping the Load Range C version (the "six ply rated" one), since a Load Range C tire could be sold to replace Load Range B tires, but not the other way around. I doubt many trailers now use a ST175/80R13 LR-B, since even a trailer maker trying to be as cheap as possible would likely choose a 12" load range D tire instead (for the same load). In larger sizes, only higher load ranges are available.
Yes, typo on my part, I have the ST175/80/13. From what I was told, it is the Load Range C/6 ply tire they are discontinuing. On my sidewall, it is a load range C, but only 4 ply, regardless, it does not really make sense to discontinue this tire for the smaller load range. I just know I spent the past week trying to find tires without having to change load range or tire size, tire size means 3 more tires or run with a spare of a different size. I am not really happy with the service level, would hate to have to find a tire here if just travelling through. What I really wanted was to buy 1 tire and use the evenly worn tire as a spare but since I found 2 tires of what I had, I am getting them both and running with a new spare.
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Old 08-17-2007, 09:52 AM   #14
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If you're interested here's a list from Goodyear's web site of tire marathon tire sizes, plus.
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