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Old 01-01-2005, 05:34 AM   #1
Montana_2230
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Tire Pressures

The decal on my Dura/max door says I should pressurize my truck tires to 80 psi rear 55 psi front. Instructions on the tire say 80 psi rear and 65 front. These are max load pressures I am assuming. What pressure would you suggest that I run the tires when not towing? towing?

On the 2955rl Montana the decal says 65 psi but tires say 80 psi. Any suggestions for a psi for the trailer?

Hope everyone had a great New Year ring in and no headaches this morning. I was in bed by 11:00 pm. Due to all the recent turmoil in the world I didn't much feel like celebrating.
 
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Old 01-01-2005, 05:49 AM   #2
Glenn and Lorraine
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I run the tires on the Chevy at 80/55 when towing and when not towing. I wore out a set of Firestones at 38,000 miles but the wear pattern was near perfect. No indication what so ever of over or under inflation.
The trailer tires are set at 75 psi and so far no under or over inflation wear pattern.

BTW- For those that do not know...
Over inflation wear pattern is when the tread is wearing more in the center of the tread than on the shoulders.
Under inflation is wearing on both shoulders more so than down the center.
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Old 01-01-2005, 06:27 AM   #3
azstar
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65# is my press. all around EXCEPT when towing. When towing I take the rear Truck tires up to 80#. This combo works well on my set up. Good stability, good ride and good tire life.

We share your feelings about celebrating this year. Just ain't the same.

Happy Camping
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Old 01-01-2005, 07:08 AM   #4
sreigle
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Different brand but that shouldn't matter. With the prior truck I ran 55 front and 75 rear, towing or not. Since we fulltime I didn't want to frequently adjust pressures and this combination did a good job while towing and also rode nicely when solo. More than that when solo and I though it rode too hard.

Current truck came with 65 all around (LR E, max 80 tires). We haven't towed with it (until this coming Tuesday) but yesterday I aired the tires for towing. Since 65 rode very very nicely I left 65 in the front and took the rears to 80. We did about 80-90 miles of driving yesterday. There was one rough road I'm familiar with that I thought I could detect the ride being firmer but otherwise couldn't tell the difference after airing them up. So we'll run with 65/80 all the time.

When we had the previous truck's tires at 55/75 we wore out the tires at about 38k miles, like Glenn. So I'm hoping the higher pressures will prolong the life of the tires, too.
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Old 01-01-2005, 07:31 AM   #5
Montana_2230
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Thanks folks for your comments. I am going to try 80/65 for a while in the truck for towing and non towing. I think I'll lower the monty's tires down from 80 to 75.
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Old 01-01-2005, 11:37 PM   #6
Montana Sky
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I run 65psi in the summer not towing on my chevy all the way around. As for towing I take all 4 up to 80psi, and my coach stays at 80psi all year. For the winter months on the truck I took the tires down to 52psi, I found they grip better on the snow and ice. My local tire shop said for those extremely cold and severe icy days one can go as low as 45psi all the way around. I leave mine 52psi all winter and have not had any trouble. The tires are wearing perfectly through the tread pattern, and remember to have them rotated every 6,000 miles as it will also help prolong the life of your tires.
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Old 01-02-2005, 10:56 AM   #7
Montana_1424
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Usually the Label is the best way to go, as the ratings in the Tires are MAX pressure. I run my tires at 70 in the front, 80 in the rear, towing and not towing, although when not towing, sometimes I do let the rear down to 70. In the summer, I make sure they are right at 80. RV pressures I leave right at 80. This seems to work well for me, no adverse ware, and all the tires look like even wear and great shape.
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Old 01-02-2005, 01:09 PM   #8
sreigle
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The label on ours says 65 all around. Yesterday I bumped the rears to 80 in prep for towing on Tuesday and it seems to ride just fine solo with 65 front and 80 rear. So I'll just leave them at that since I'd otherwise be changing pressures more often than I care to do.
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Old 01-03-2005, 01:44 AM   #9
Bill and Ann
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I run the same as Glenn and Lorraine. 55/80 all the time.
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Old 01-04-2005, 02:57 PM   #10
FredG
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I've been running 60/75 all the time since April. No ill effects and the wear pattern is fine. Just remember to rotate them every 6,000 miles and ensure you air up to the same levels front and rear after a rotation (I've found the mechanics seem to air my tires to 50 or 55 all around).
I'll have to see how it handles in the snow this winter, I may air the rear down to 55 if it doesn't handle as well as last year.

Fred
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Old 01-04-2005, 04:00 PM   #11
lightningjack11
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Floridanomads,

Look very close at the sticker on the Montana. If it has 65 psi the sticker probably also calls for ST trailer tires.(65max)

But sometimes Keystone puts ST on the sticker but they actually come with LT truck tires.(max press 80) They make this mistake sometimes. Obviously you have LT tires.

The max cold pressure is on the tires. Also be advised that the load capability of the tire changes with pressure.

Lately I have been running just under 65 on my ST Trailer tires.
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Old 01-09-2005, 04:30 AM   #12
sreigle
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Tom's point about checking the tires themselves for ratings is a good one. The sticker on our Montana says it has ST tires with Load Range E, max 80 psi. But the rig was delivered with ST tires, Load Range D, max 65. The tires are rated sufficiently to handle the GVWR but the sticker is wrong.
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Old 01-09-2005, 06:03 AM   #13
Montana_2230
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My trailer tires are LT load range E, max pressure 80 psi. I have decided to run my trailer tires at 80 psi, but still deciding about my truck front tires...will carry 80 psi in truck rear tires.

Appreciate all the responses...thanks
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Old 01-09-2005, 07:38 AM   #14
Sunseekers
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Floridanomads
Your truck is a diesel and the large part of total weight is on the front tires. My front axle is 4200 lbs and the rear axle is about 3200 lbs (not hooked to 5th wheel).
80 lbs of pressure in your rear tires (which is about max)seem like to much, in my opinion. You don't need the 80 lbs in the rear tires until you are towing.
My front axle weight is always the same (4200 lbs) hooked or unhooked from 5th wheel.
I run
Not pulling 70 lbs front -65 rear
Pulling - 70 lbs front - 80 rear
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