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Old 06-11-2014, 07:51 AM   #183
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Seems like the only luck I'm going to have (if swapping all 4) is the Goodyear G26 Cargo 225/70/R15C LRD. 2470#, 65 PSI, 106mph, made in France or Germany.

So if the GYMs were 225/75, these would be the same width as those but about 1/2" shorter.

Really wavering here. Replacing the scuffed Michelins is the easiest choice. Swapping out to a whole new set to return to original load capacity and headroom is tempting - but at 5800# loaded for camping, I still have plenty of headroom with the derated Michelins (7800# for the 4 combined or 27% headroom on their derated capacity).

Seems the only good reason to swap out all 4 is for the NEXT time which is a few years away.

I'm going to stick with the Michelins for now and when it's time to replace all 4 I'll go back to a 15" LRD (if they're still making them at that time :-) ).

Thanks again for all your help.
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Old 06-11-2014, 07:57 AM   #184
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Ok wait - still wavering :-)

Would one advantage of LRDs over LRCs be "stiffer" sidewalls? I know the ST argument - I'm not asking from that perspective. Just pure C to D comparison of two 15" radial LT tires - does the D handle those high pressure slow turning challenges better than a C?
Thanks!
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Old 06-11-2014, 08:19 AM   #185
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I think maybe Capri Racer or Tireman9 could give you the best answer on that question, Steve.
Tire weight is something to look at or compare (when all else is the same). LT235/75/15

The Pirelli Scorpion ATR LRD tire weighs 38lbs
The GoodYear Wrangler HT LRC weighs 32lbs

However-
The Firestone Transforce AT LRC weighs 44lbs I think this may be because this tire has a "Commercial" designation.
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Old 06-11-2014, 10:12 AM   #186
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I think the difference is that load range C tires max out at 50 psi. Load range D goes to 65. You get more weight capacity with the D's. The extra psi probably makes them stiffer, good for turning, etc. If the trailer came with load range D then that is what I would want to go with. If it came with steel wheels and load range C tires then I would use a load range C or a p 235 XL tire at 50 psi. Mine works fine with those. I did not want to put the C tires or the P 235XL tires on a trailer that came with Al wheels and load range d tires at 65 psi. The big trailer sets still most of the timea so I am using GYMs on it still. Going on 4 years and time to change if I decide I want to pull it.
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Old 06-11-2014, 06:15 PM   #187
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Ok, I've wavered myself back (for now ;-) ) to going with a new set of 4 Goodyear Cargo G26 tires.

Since the GYMs were Load Range D, I feel better about returning to that capacity, even though the Michelins have 27% headroom on their already 10% derated capacity. My question about side forces and "stiffer" sidewalls seems to me (ignorance red flag here ;-) ) to be addressed by two factors:

1) at 5800# fully loaded for camping, that leaves 42% headroom on the 10,000# capacity of these G26 tires (i.e., they won't be stressed at the same ratio as the Michelins are)

2) higher PSI *should* mean better ability to handle that twisting trailer wheel problem that occurs with multi-axle. At least, it seems that way in a given tire (ref. this article: http://www.rvtiresafety.com/2013/11/...abble.html?m=1 ) though I'm not sure this applies purely to maxing the inflation on a GIVEN tire or to overall higher PSI (e.g., a tire with 65 max vs one with 50 max).

So this is not a simple decision and I'm sure I am not as informed as I'd like to be. But that's where I'm at for now.

Any other thoughts? Anything I'm missing? Thanks!
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Old 06-11-2014, 07:52 PM   #188
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Ok, I've wavered myself back (for now ;-) ) to going with a new set of 4 Goodyear Cargo G26 tires.

Since the GYMs were Load Range D, I feel better about returning to that capacity, even though the Michelins have 27% headroom on their already 10% derated capacity. My question about side forces and "stiffer" sidewalls seems to me (ignorance red flag here ;-) ) to be addressed by two factors:

1) at 5800# fully loaded for camping, that leaves 42% headroom on the 10,000# capacity of these G26 tires (i.e., they won't be stressed at the same ratio as the Michelins are)

2) higher PSI *should* mean better ability to handle that twisting trailer wheel problem that occurs with multi-axle. At least, it seems that way in a given tire (ref. this article: RV Tire Safety: "Interply Shear" and other Techno Babble ) though I'm not sure this applies purely to maxing the inflation on a GIVEN tire or to overall higher PSI (e.g., a tire with 65 max vs one with 50 max).

So this is not a simple decision and I'm sure I am not as informed as I'd like to be. But that's where I'm at for now.

Any other thoughts? Anything I'm missing? Thanks!
My feelings are that the GY Cargo is probably a good choice. However, the only thing I would add that seems to be somewhat unique to your world there in all things Airstream, is this often noted "need" for the A/S structure to have a gentle ride. To that end, perhaps the Michelins you are running "might" hold an advantage over the cargo G26 ??? I just don't know.
I guess if I were personally in your shoes, I could see myself just replacing those two Michelins with the same, and heading on down the road.

EDIT: or you could run two Michelins, and two GY Cargo G26's....and give us all a report on which lasts better
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Old 06-11-2014, 08:25 PM   #189
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Steve,
The GoodYear Cargo G26 are good tires, I'm sure. I'm not a fan of GoodYear, but they do make very good tires in Europe. They fit your application. Good choice in my opinion.
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Old 06-11-2014, 10:42 PM   #190
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Find out if those GoodYear Cargo G26 are stocked nationwide like the Michelins. Call a few dealers in places you like to go and actually verify stock. That availability might impact your selection process.
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Old 06-12-2014, 08:16 AM   #191
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Something else to think about is your trailer height in back. I have the Vanco2 tires which are the same size as the Cargo (225/70/15). The 1/2" difference at the tire relates to almost 1" at the back end unless you re-adjust your hitch. Mine turned out good since I was a little low at the hitch to start out with. My next set of tires will be 235/75 /15 so I have some extra height in the back and all around (I will re-adjust the hitch).
If you are set up now for the 235/75/15 ones, you will be lowering the trailer at the tires 3/4" using the Cargo tires. That would lower the back end around around 1.5" to 2" ?? unless you do the hitch adjustment. One more thing to pounder
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Old 06-12-2014, 09:25 AM   #192
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Diameter Tidbits:

GoodYear Marathon ST225/75R15D.....28.3".....2,540 pounds @ 65 psi

Michelin LTX (P) 235/75R15 XL...........28.9".....1,985 pounds @ 50 psi-derated

Michelin LT225/75R16/E LTX M/S2.......29.2".....2,680 pounds @ 80 psi

So when I installed the 15" Michelins on the 25FB, the trailer got 0.3" higher.

When I installed the 16" Michelins on the Classic, the trailer got 0.45" higher.

The factory for 2015 is putting the 16" Michelins and SenDel wheels on the new 30' Classic. (They ought to for the 27% price increase!).

The net result with my rig setup with a ProPride hitch is that I am " low in the front of the Classic loaded for camping.
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Old 06-12-2014, 10:32 AM   #193
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I'm not sure how accurate this is, but my tire guy says the Michelins (P235/75/R15 LTX M/S2) are discontinued. He can't order them anymore.

Has anyone heard that from another source??
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Old 06-12-2014, 11:19 AM   #194
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I'm not sure how accurate this is, but my tire guy says the Michelins (P235/75/R15 LTX M/S2) are discontinued. He can't order them anymore.

Has anyone heard that from another source??
No. I was just at Discount Tire yesterday evening and asked how much they were. They had an LTX M/S2 P235/75/15XL on display.
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Old 06-12-2014, 11:44 AM   #195
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I think this topic has been overthought. The info is there, all one has to do is make a decision. Jim
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Old 06-12-2014, 11:46 AM   #196
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I'm not sure how accurate this is, but my tire guy says the Michelins (P235/75/R15 LTX M/S2) are discontinued. He can't order them anymore.

Has anyone heard that from another source??
TireRack still lists them as available.
If you are are thinking long term, and whether "replacements" may or may not be available a few years down the road, well good luck on that. All these companies continually develop new, replacement models, so older designs sometimes drop off the end of the list.
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