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Old 05-27-2011, 09:04 AM   #15
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Rick,
I forgot to mention that if you weigh your tires individually, you use the highest weighted tire to determine pressure for all tires on the same axle.

At least that is the way I remember it.
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Old 05-27-2011, 09:14 AM   #16
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Quote:
Originally Posted by mikron View Post
A GVW of 20850 loaded 235/80 22.5 chart says 80 lbs. Thats what I keep in them and they ride good for a gasser.
mike, you say 80# , i have a 33 and it calls for 90# on the same wheels
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Old 05-27-2011, 09:46 AM   #17
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So the pressure the Hendersons put in was probably correct at the time. Knowing Hendersons and their reputation plus having them evaluate our DSDP I'm betting they were right at the time.
I couldn't agree more.

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Originally Posted by gmanatl View Post
What does the placard say on your coach? I have a 2008 tour and run 110 in front and 90 in the rears. This is what my placard says and is the same as one of the Winnie regional reps who had the same coach. Handling and ride have been very good and I get 9.2 with the 400 isl towing a grand Cherokee.
That's a good point and I should check it out. Frankly, I've never looked at it thinking that basing pressures on weights and tables was a better way to go. That's some great mileage you're getting.

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Rick,

What brand of TPMS do you have?

If I had 5 sensors fail in 2 years, that's one brand I would stay away from.

I purchased the Doran Pressure Pro and only had one sensor crap out on our initial trip to Alaska last year. They shipped a replacement to Alaska and after 15,000 miles all sensors are still performing flawlessly.

I always take them off after reaching my destination to save battery life.

Dr4Film ----- Richard.
I hear you Richard. I have a Doran 360. If I understand it correctly, it was the first offering from Doran after they parted way with Pressure Pro.
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Old 05-27-2011, 04:36 PM   #18
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In the case of the placard.. It is the proper pressure for the coach (or it should be) EMPTY, no water, no waste, no food, no cloths, no grill no tools no (or nor more than 1/2 tank) propne. and just the driver.

That is the proper pressure as it was driven out of the assembly plant.
You may be right, but I seriously doubt it. I would bet money the tire pressure placard is based on the maximum gross vehicle weight, which is also on the placard. Otherwise they are opening themselves up for a huge liability. Amazing, the amount of bad "factual" info floating around the internet.
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Old 05-27-2011, 04:56 PM   #19
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Even if it's based on max GVW.. Are you EXACTLY at Max.. The fact is whomever wrote that number on the placard has no idea of what you are going to put in the rig, He does not know how much YOU weigh, nor your domestic partner (Spouse) How many kids you will be carting, how many pets, if those pets are little kitties or full grown Saint Benards.

So how can he possibly write down the right pressure for your load?

Blind luck, nothing better.

And remember when ford filled tires on one of it's SUV's 5 pounds LOW.. Firestone took the heat.
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Old 05-27-2011, 05:26 PM   #20
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The fact is whomever wrote that number on the placard has no idea of what you are going to put in the rig, He does not know how much YOU weigh, nor your domestic partner (Spouse) How many kids you will be carting, how many pets, if those pets are little kitties or full grown Saint Benards.

So how can he possibly write down the right pressure for your load?

.
That has always been my understand as well.

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Old 05-27-2011, 05:47 PM   #21
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I don't understand why the tire manufactures guidelines are not used! Both Goodyear and Michelin say to air the tire to the pressure needed for the weight of the axle. The placard doesn't mean squat. Of course thats only my opinion and that of Mike Cody at Camp Freightliner.
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Old 05-27-2011, 05:50 PM   #22
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Thanks Jim. I think most of us are saying just that.

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Old 05-27-2011, 06:50 PM   #23
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I hate to admit this, but I agree with Jim.

However, my tires, 25580R22.5, are rated at 110 psi max load. For two years that is what I have run them at because basically I did not fully comprehend the tire tables. Was I ever loaded to MAX weight? No. Did I hurt my tires? No. Would my ride and handling been better at weight table weights for my axles? Yes. I guess I was just used to the rougher ride. The placard on my MH only states "suitable tire inflation and rim choice." For the front at GVWR of 10400 it states 110 psi, and for the rears at 17500 it states 95 psi. I ran at 110 on all four tires, that is the max allowed for those tires. Was I wrong? Only in the eyes of the tire police. I never had a problem with my tires that I did not create myself.
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Old 05-28-2011, 08:38 AM   #24
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Originally Posted by Elkhartjim View Post
I don't understand why the tire manufactures guidelines are not used! Both Goodyear and Michelin say to air the tire to the pressure needed for the weight of the axle. The placard doesn't mean squat. Of course thats only my opinion and that of Mike Cody at Camp Freightliner.
Jim I believe the placard is required,, So they have to put SOMETHING on it, so they either go with dry weight, full max weight or their best guess, In nearly all cases it is the WRONG weight, but since they can not possibly know just how heavy you will wind up, How can they do better?

The problem is: People take that figure as "Gospel" or worse yet they read on the tire where it says something like "Perssure 110PSI" they do not read the full sentence, they get serious lug-nut vision (Way smaller than a tunnel) so they never read the full line.

This applies to ALL tires, not just motor home tires by the way.

Now people like you, and I, and any one who's ever contacted the folks at RVSAFETY (aweigh-we-go) and gotten the rig weighed, THEY know the proper pressure is found using scales under the wheels.

But alas,,,, We need more of them. Most folks simply do not know that, and likely never will.

There are other ways to figure it out too but the scale is still the best.
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Old 05-28-2011, 11:16 AM   #25
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Jim I believe the placard is required,, So they have to put SOMETHING on it, so they either go with dry weight, full max weight or their best guess, In nearly all cases it is the WRONG weight, but since they can not possibly know just how heavy you will wind up, How can they do better?

The problem is: People take that figure as "Gospel" or worse yet they read on the tire where it says something like "Perssure 110PSI" they do not read the full sentence, they get serious lug-nut vision (Way smaller than a tunnel) so they never read the full line.

This applies to ALL tires, not just motor home tires by the way.

Now people like you, and I, and any one who's ever contacted the folks at RVSAFETY (aweigh-we-go) and gotten the rig weighed, THEY know the proper pressure is found using scales under the wheels.

But alas,,,, We need more of them. Most folks simply do not know that, and likely never will.

There are other ways to figure it out too but the scale is still the best.
I'm struggling with this information regarding the placard - but I'm darn sure no expert so please be patient. I'd really like to confirm my thinking here, or get a better understanding if necessary.

From what I see on my placard (coach seen below), the placard lists an air pressure for a given tire size as well as the weight capacity of the axle. Given this information, assuming only that you are using the tire size listed, and you aren't exceeding the GVWR on the axle, those listed air pressures should be correct? No?

The only way I should ever need more than this suggested air pressure, would be in instances where I'm exceeding the chassis manf's weight rating?

So taking this a step further, the only time I should need to reference a tire chart is if I decide to change tire sizes, or to confirm I'm within the tire manf's suggested capacities with the information given on the placard?

All thoughts welcome!
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Old 05-28-2011, 12:24 PM   #26
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From what I see on my placard (coach seen below), the placard lists an air pressure for a given tire size as well as the weight capacity of the axle. Given this information, assuming only that you are using the tire size listed, and you aren't exceeding the GVWR on the axle, those listed air pressures should be correct? No?

The only way I should ever need more than this suggested air pressure, would be in instances where I'm exceeding the chassis manf's weight rating?

So taking this a step further, the only time I should need to reference a tire chart is if I decide to change tire sizes, or to confirm I'm within the tire manf's suggested capacities with the information given on the placard?

All thoughts welcome!
I think what you outline is true (so long as the psi on your placard is reflecting GAWR) but doesn't address the ride comfort and handling issues Wayne spoke of above. Said another way, you won't hurt your tires or rig doing it this way and it won't be unsafe but your rig might handle and ride a bit better if your actual pressures are based on your actual weight and the tire tables. You might be running more pressure than you need.

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Old 05-28-2011, 03:07 PM   #27
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RickO,

You did not give enough info to provide an accurate answer.

Needed is the load range of your tires and the corner weights.

Most of what has been posted is not accurate with out the above info.

As I look at the Michelin chart Henderson was in the ball park and they knew the corner weights.

80 psi is way low for the axle weights you gave.

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Old 05-28-2011, 04:20 PM   #28
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Al,
The Michelin charts only have the following for his tires:

275/80R22.5 LRH XZA3, XZE

The load inflation for the XZE is listed:

See narritive on the first page of Michelin Recreational tires.
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