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Old 03-29-2010, 05:10 PM   #15
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Max H,

If you have the available capacity, I would inflate all 4 drive tires 10 more lbs when cold. Don't be concerned with the pressure difference after they heat up. The extra pressure will give you more load carrying capacity and the pressure difference when hot may be less. I would not under any conditions inflate tires on the same axle to different pressures when cold.

I am so sorry for the loss of your family member. We lost our 11 year old Rottweiler, Jake, just over one year ago and I miss him every day. He full timed with us for his last 2 years including a trip to Alaska and he loved going places & meeting people.

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Old 03-29-2010, 06:13 PM   #16
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[QUOTE=Max Hubrich;620360]Good points--

Here are the pictures of the most recent failure of my RR inner blowout. The tire had 4000 miles on it. It occured at 6:30 am, just slowing down to exit the I-10 interstate in Gulfport MS. The sun was not a factor as we were driving from 12:30 am, at an average of 60 mph. It was in early November, ambient temperature about 50 degrees.
The tire was born in mid '07. Michelin replaced that tire (at no cost) with a new one. I also bought another one, so that side of the axle has two mated, brand new tires.

You didn't really say which direction you were coming from. And if you just came out of Louisiana there are a number of things on that piece of highway that would cause damage to a tire like that. It's gotta be the roughest road in the US. From our last trip there, bulging concrete, repeating dips, washboard effect, huge pot holes, are just a few. You think it may have been attributed to that??


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Old 03-29-2010, 06:38 PM   #17
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Let me throw another angle on this situation of higher pressures on matching tires. I run the crossfire system which is to keep both tires at the same pressure. Also if you have the proper PSI gage all you have to do is look at the gage and you see the pressure range.
Havent had a blowout since running these.
Max: Lost our 15#,13 yr old, guard dog last spring so I know what you are going through!
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Old 03-29-2010, 07:31 PM   #18
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We came from Thomasville GA. Got on I-10 at Tallahasse. The road was in good shape.

Next tires I buy will be higher rated and probably a different brand.

I am now running higher pressures (100 psi- cold)-- than when this last one blew out. As I said, I'm going to put 110 psi in the right outer tire. I can't tell any difference in the ride running higher pressures. I think I feel a little more "push" when an 18 wheeler passes by me- I just poke along about 60 mph nowadays.

We've run out of tissues around here-- Still can't talk about Jessie to anybody.
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Old 03-29-2010, 08:54 PM   #19
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Hey Max,

Sorry about the dog.. Been there done that.

You know our rig. Currently we are setting at Casion Queen RV Park in East St Louis looking at the ARCH glowing in the night lights.

We have been about 3600 miles on this trip so far. We started out with 100# cold all around although cold was at about ZERO degrees when we left Maine. We did have to drop about 5#s at Pedros on the way to Florida. Big difference at that temperature as our hot pressure was as high as 127 at one point heading south.

"COLD" is a relative term!!!

We are leaving here in the morning heading to Kentucky and I'm looking at 104# cold and 51 degrees on all six right now. As we head up Rt 64 I'll let you know what happens but thus far nothing has been out of line in that one wheel position.

Have you pulled into a Cat Scale to check or better yet can you weigh the two rear wheel placements individually? Possible your a little heavy in that spot?

Let us know when you get to Grays. We owe you lunch...
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Old 03-30-2010, 07:49 AM   #20
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Max, I am sorry for your loss. But the great times you have had with him over the years, will be with you always.

I would NOT run the inner dual at a lower pressure than the outer. That will immediately cause it to run even hotter. All tires should be inflated for the load, while cold. The presure changes while driving should not be taken into account; e.g. you don't check them at a roadside stop, and let air out because they are reading higher than you inflated them to.

Inflate them all to the recommended psi from the load inflation tables, and leave them alone. There are many reports of Michelin XRV zipper rips, where rusted steel belts were found in the blown tires . One of our forum members here was killed several years ago, when a new XRV LF tire zipper-ripped, and he lost control of the coach.

There are many reports of these tires failing; just google michelin zipper rips. I replaced mine with Goodyear G670RV's. IMO, a better tire. They have a larger footprint, and a load rating 'H', which is capable of carrying more weight, even at lower pressures, than what you have now. That's a good safety margin. They have the same LOADED RADIUS as your tire, so speedo isn't affected.

Whatever you do, set the cold inflation pressures according to the table for your tire and load. Suggest you call a tech rep at the tire manufacturers, and ask them if you should be letting air out of the inner dual. If you do, I'd be curious what they tell you.
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Old 03-30-2010, 12:34 PM   #21
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I've been in the process of replacing all tires on our Rv,looking for best price and tires.I blew the right rear outside dual this year coming home from Florida.Two years ago coming home again from Florida just North of the border on 95 I blew same tire.All tires are a Goodyear tire currently on unit.My question have any of you every heard of the Sumitomo Tire and if so what can you tell me about them.They are by far the cheapest in cost ,but I don't want to compromise safety to save a dollar.Most Goodyear run much higher in cost of this tire plus balancing and mounting.Your thoughts please ...............Dave

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