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Old 08-06-2014, 02:18 PM   #29
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Hey thanks for the sanity check. Yeah, the door sticker on my 2014 Ram 1500 Laramie says the tires are P275/60R20 and that the pressure should be 39PSI cold with a GVWR of 6800 lbs.
Same on my 2013 Dodge RAM 1500 Outdoorsman.
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Old 08-08-2014, 03:34 PM   #30
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I'm contemplating going with 15 inch Sendel wheels with Michelin LTX M/S 2 P235/75R15 108 XLs. They are rated at 50 psi. Does anyone have hot weather temp readings for these tires?

I checked the sidewall temps of the 14 inch Goodyear Marathons on my two week old 2014 International 23D with my infra-red digital pyrometer. It was 92F outside and we were on a rather rough section of US 101 near Camp Roberts, CA. I took readings as soon as I hit the rest stop.

I was rather shocked by these readings: LR 134, LF 133, RR 142, RF 143.....shade side...sun side.

Tire pressures were set at 50psi cold (62F) and again checked the next day they were at 50psi cold (65F).

These readings are at least 10 degrees higher than those taken of the 16 inch Michelin LTX M/S tires (78F cold) on my International 19 in even hotter conditions.
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Old 08-08-2014, 04:12 PM   #31
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ST tires run hotter than other tires because of their inferior design. They need to be discontinued and redesigned.
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Old 08-08-2014, 04:54 PM   #32
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interstateflyer,

If you are going to replace wheels and tires, why not go to the 16"? With the 16" you will have the same specified load carrying capacity as the GYMs. With the P225 tires you will not. While the rated capacity of the tires is in excess of the GVW, the extra margin of the 16" helps mitigate the additional stresses that exist in a tandem axle trailer. That said, many on here run the P225 tires with apparent success.

The GYMs at 65 psi are rated at 2540, 4 gives you 10,160#. 4 P225 15" tires at 50 psi/1980# = 7920# while 4 LT225 16" tires at 75psi/2560# = 10,240#.

I struggled with that tradeoff when I was considering keeping my original wheels, but purchasing new wheels would seem to make the price difference to go to 16" small in comparison to the extra capacity.

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Old 08-08-2014, 05:39 PM   #33
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interstateflyer,

If you are going to replace wheels and tires, why not go to the 16"? With the 16" you will have the same specified load carrying capacity as the GYMs. With the P225 tires you will not. While the rated capacity of the tires is in excess of the GVW, the extra margin of the 16" helps mitigate the additional stresses that exist in a tandem axle trailer. That said, many on here run the P225 tires with apparent success.

The GYMs at 65 psi are rated at 2540, 4 gives you 10,160#. 4 P225 15" tires at 50 psi/1980# = 7920# while 4 LT225 16" tires at 75psi/2560# = 10,240#.

I struggled with that tradeoff when I was considering keeping my original wheels, but purchasing new wheels would seem to make the price difference to go to 16" small in comparison to the extra capacity.

Al
I'd use 16 inch wheels but the 23D's 14 inch hubs are 5 bolt. 16 inch trailer wheels are typically 6 bolt.

Sendel makes 15 inch trailer wheels with a 5 bolt configuration.

The Michelin LTX M/S 2 P235/75R15 108 XLs are derated for trailers to 1985 lbs. at 50 psi.

The GYM ST215/75R14s on the trailer are rated at 1870 lbs. at 50 psi (the recommended pressure).

The trailer has 3000 lb axles, a GVWR of 6,000.

Your point that 'additional stresses exist in a tandem axle trailer' is one of the issues that I've yet to resolve. I'm wondering how the sidewall construction of the Load Range XL Michelin LTX M/S 2 P235/75R15 108 XL compares to the supposed purpose built Load Range C GYM ST215/75R14s.

Another issue is putting 15 inch wheels on 10 inch brake hubs. All other A/S
brakes are 12 inch. Would I be over stressing the 10 inch brakes/hubs?
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Old 08-08-2014, 09:57 PM   #34
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The Michelin LTX M/S 2 P235/75R15 108 XLs, derated for trailers to 1985 lbs. at 50 psi with total capacity of 7,940 lbs. are pretty attractive. The max weight for our 27FB is 7,600, so those tires should be up to the job. If we don't go for 16" wheels at some point, we'll probably just move to these for our 15" wheels to get away from the ST tires.
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Old 08-08-2014, 11:37 PM   #35
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~~

Your point that 'additional stresses exist in a tandem axle trailer' is one of the issues that I've yet to resolve. I'm wondering how the sidewall construction of the Load Range XL Michelin LTX M/S 2 P235/75R15 108 XL compares to the supposed purpose built Load Range C GYM ST215/75R14s.

Another issue is putting 15 inch wheels on 10 inch brake hubs. All other A/S
brakes are 12 inch. Would I be over stressing the 10 inch brakes/hubs?
I have over 8k miles on those Michelins on my tandem-axle Argosy, and I know people who have more than that with them on heavier trailers. The only problem I've had with them so far was one bad valve stem, and I'm fairly sure it wasn't made by Michelin.

That's towing in Texas heat around 70 mph, too. They run cooler than my truck tires! However the construction compares, the tires perform quite well on a tandem-axle Airstream in my experience.

I don't think the larger wheels will bother the brake drums at all, and if you had enough brakes with 14" wheels you'll have enough with 15s (and will be able to use more of it before they slide, too!)
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Old 08-09-2014, 07:13 AM   #36
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Originally Posted by Silvery Moon View Post
The Michelin LTX M/S 2 P235/75R15 108 XLs, derated for trailers to 1985 lbs. at 50 psi with total capacity of 7,940 lbs. are pretty attractive. The max weight for our 27FB is 7,600, so those tires should be up to the job. If we don't go for 16" wheels at some point, we'll probably just move to these for our 15" wheels to get away from the ST tires.
That's exactly what we did on our 27FB which on the scales fully loaded for camping has about 5800-5900# on the trailer wheels (so with about 8k# derated capacity I'm at about 75% - feels like plenty of headroom). I recently scuffed the curbside pair pretty badly on some construction in NH and replaced them :-(

But they've served me pretty well on some long trips (CT to TN, CT to OH) and even in 90 degree weather only a 10% rise in pressure and 30 degree rise in temp (consistent in all conditions) according to my internal TPMS monitors.
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