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Old 03-28-2014, 06:51 AM   #29
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Looking at the spec for that tire here:

I see 80 PSI as the max. I'd look very carefully at the Michelin spec for your tire and go by that.

My Airstream Manual has the torque spec as 120# for lug nuts. I carry a torque wrench just for this purpose.

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Old 03-28-2014, 07:09 AM   #30
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When I bought my Sendel T03's from Tredit, I asked them for the torque guidelines for those wheels. They told me 120 ft lbs. My manual from Airstream advised 80 ft. lbs for the original Alcoa's. I had some concern about torquing those lugs almost 50% higher than original specs, not knowing if the hub spindles could be torqued that high. I decided to torque to 100 ft lbs. I've found that that holds the wheel tight and doing further checking over the past two years, I've found that the lugs pretty much stay at 100.

I run my tires at 80 psi due to the heavy weight of my Classic SO.


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Old 03-28-2014, 08:08 AM   #31
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I find it kind of funny that the OP didn't post much in the way of information, but lots of folks have an opinion.

First, what tire size came off? What does the placard say about tire size and inflation pressure? (Please note: It is important to include the letters in front of and behind the tire size. Those letters clue tire folks into what kind of tire is being specified.)

Second, trailer manufacturers are notorious for undersizing the tires on their vehicles. I don't have enough information about Airstreams to know if they do or don't or if they changed (and when), so I would look at placard pressure with a grain of salt - it might be a little on the skinny side.

I think an upgraded tire combo also needs to upgrade to the load carrying capacity. If you'll notice the load tables are minimums, not recommendations. I recommend you use a minimum of 15% over capacity.

I also recommend you weigh the trailer - in the worst possible case you can imagine. Weight individual wheel positions if you can. If not, you need to account for side to side and front to rear variations. It isn't the lightest loaded tire that fails first. It's the most heavily loaded tire.
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Old 03-28-2014, 05:51 PM   #32
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Tire Pressure and Torque

This is a reply to Jammer. I will reduce the psi to 80. This is the pressure Jackson Center uses. It seems the 120 torque setting is okay. I had the trailer weighed yesterday - it came in at 8,380 lbs. The tires fit fine and performed well on a 2 day trip home from a caravan in FL (the tires were installed in Palm City FL and we live in suburban Nashville). There are no fit problems I can see. The chrome trim on the edge of the wheel well is close to the tire and a guy in our caravan who had the same thing done to his trailer removed it from the well, trimmed it with a shears and reinstalled it. I plan to do the same thing (I am not sure it is necessary but I respect his judgment). I noticed that the stabilizers have to reach a little further when I crank them down but that is all. I probably will lose the use of my BAL X-Chock stabilizer because it doesn't close to the reduced distance between the tires and will have to find a substitute. I also plan to put a TPMS sensor on each of the tires. Two tire problems on the interstate are two too many for an old timer like me.
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Old 05-22-2014, 05:24 AM   #33
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I made the switch from GYM 15" on our 30' Flying Cloud to Mich 235x75x15 LTX with max tire pressure on the sidewall of 50#. I took the trailer for a test on the interstate empty. The trailer hit a patch of interstate and started to bounce so bad I had to slow it down to get it to stop, I was going 70 mph. I pulled into a rest area to see if she had thrown a wheel weight, had not. So I suspect too much tire pressure. Anyone else run into this with these tires and if so what tire pressure do you run?


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Old 05-22-2014, 05:34 AM   #34
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I made the same switch on my 27FB. How much does your trailer weigh and is that a tri-axle unit?

I go with the 50# setting and have had no problems like the one you mention.
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Old 05-22-2014, 05:36 AM   #35
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70 mph? Still should not have been bouncing. How is your hitch setup. WD and sway? Jim
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Old 05-22-2014, 05:36 AM   #36
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Are there shock absorbers on your camper?
The higher your expectations the fewer your options.
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Old 05-22-2014, 12:47 PM   #37
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I can't tell a difference in the trailer ride whether I have 50 psi (what I've always done) or 65 psi (what the tire placard says).
I can't tell a difference in stuff inside moving around, either.
I can, however, feel that the trailer has less rolling resistance at the higher tire pressure.

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