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Old 09-19-2018, 02:46 PM   #1
Joffles
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2007 Montana mountaineer wheel rating

I was wondering if anyone knew what the stock wheels were rated for as far as pressure. I just put G-rates tires on but didn’t realize that the wheels may not be rated for enough pressure. The tire place also couldn’t find any rating for pressure stamp on the inside of the wheel. There is a stamp for 3750 lb load though. Would that indicate a 110 psi rim?
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Old 09-19-2018, 04:45 PM   #2
DQDick
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It should be on the inside of the wheels, but basically, if they are the OEM wheels, they are 80# wheels. Keystone didn't go to 120# wheels until some point in the early part of the 2010 model year.
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Old 09-19-2018, 05:01 PM   #3
Joffles
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Ok thanks! Because my camper is only a little over 10,000 lbs loaded, do you think running 90lbs in these Rims with g rated tires would pose a problem? Rim looks pretty beefy to me. I heard the manufacturer was putting 110# stickers on these rims at one point?

Tires are Samson gl285
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Old 09-19-2018, 06:59 PM   #4
Joffles
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I guess I may have really screwed up. I’m pretty sure my camper has 6k axles. Is it a problem to have these g rated tires and upgraded rims 110 psi (if I decide to buy them)? Or am I overthinking this? Would I need to get new axles to use these tires? If so, I’m ditching these tires. As much as I like the sound of the g rated load for my camper, this is getting ridiculous.
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Old 09-19-2018, 10:05 PM   #5
AZ Traveler
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You are fine with your G rated tires inflated to 80 PSI. They will give you some excess load capacity.
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Old 09-24-2018, 10:50 AM   #6
PSFORD99
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Originally Posted by Joffles View Post
Ok thanks! Because my camper is only a little over 10,000 lbs loaded, do you think running 90lbs in these Rims with g rated tires would pose a problem? Rim looks pretty beefy to me. I heard the manufacturer was putting 110# stickers on these rims at one point?

Tires are Samson gl285

They were putting on the 110# stickers . Here is what happened , it was around early 2010. Guys were wanting to run the G rated tires.

A thread got started here, and my china brand tires at that point on my 2008 Montana fifth wheel were about two years old, and I wanted to get them off before a blowout. Well I believe Tredit was sending out the 110 stickers for the wheel I have on mine. Great I went and bought a set of G614's, and not long after that they changed their minds on the 110 rating, back to 80.

Well that was over 10 years now I am still running a G rated tire on those wheels, no issues after many thousands of miles . Not recommending anyone to do that, but I was not the only one to get caught up in that 110 rating.

Some on here may remember that fiasco . I only run my Sailun S637's at 95 psi.
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Old 09-24-2018, 11:07 AM   #7
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Originally Posted by Joffles View Post
I guess I may have really screwed up. I’m pretty sure my camper has 6k axles. Is it a problem to have these g rated tires and upgraded rims 110 psi (if I decide to buy them)? Or am I overthinking this? Would I need to get new axles to use these tires? If so, I’m ditching these tires. As much as I like the sound of the g rated load for my camper, this is getting ridiculous.
On a further note here. IMO I think you are over thinking this, but if it worries you I would change wheels. Changing wheels would probably be just as cheap or cheaper then the tires. What brand of tires, I'm thinking Sailuns, if so I would definitely not get rid of them.

Here is my take again on this 110 sticker thing, they got worried on the liability of rerating those wheels. To me they thought they were okay, but did not want to be liable. In my case I was not worried, but did keep a close eye on them, still do.

You are correct , you most likely with the year ,and weight of your fifth wheel you have 6K axles. Would I ditch those tires, no. I wouldn't run them over 90, its not needed, but I would either wear them out, or age which ever comes first.IMO you did not screw up.
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Old 09-24-2018, 11:46 AM   #8
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Thanks a lot for the replies. Makes me feel a lot better as far as safety. I bought a set of Samson gl285T tires. They are a 14 ply ST tire like the Sailun. They are quite beefy and have a good reputation locally with guys that pull heavy machinery.

I just ran a short trip run about 60 miles away at highway speeds with 80psi. They seemed to do well. They pass the eyes test as far as how they look while riding and parked. My camper sticker calls for 80 psi. These tires are rated for 105 psi. We ride light which loaded is probably 11,000 lbs so I went light on pressure not wanted too much Bounce or jarring to the camper.

I’ll keep the stick rums and just run a bit lower psi for the time being. Going to check temps with a gauge on longer trips though just to be sure.

Thanks again
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Old 09-24-2018, 03:42 PM   #9
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It should be on the inside of the wheels, but basically, if they are the OEM wheels, they are 80# wheels. Keystone didn't go to 120# wheels until some point in the early part of the 2010 model year.

You could make the argument that back then , and for that matter now the Goodyear G614 is rated for 3750 @ 110 psi. Which could also mean the wheels rated @ 3750 would accommodate the 110 psi . If not mistaken my OEM Mission ST tires were rate for 3500 @ 80 psi, obviously to cover the 7K axle ratings.

My OEM wheels on my 2008 Montana 3400RL has no markings, so back in 2010 when the manufacturer of the wheels decided to rerate the wheels they sent out those 110 psi stickers, and then later as I said in my previous post changed back to the 80 psi. Thats some of the reason I decided to go ahead , and use them for a higher psi, then what they ended up being rated at, that and I had already installed the G614's

I am sure now as I was then they thought they were good for 110 psi, but decided against it for liability reasons .
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Old 09-24-2018, 04:27 PM   #10
Tim Swenor
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2017 Montana 3950 fifth wheel
7,000 lb axles x 2 =14,000# rated
GVWR of trailer is 16,885#
(do you already see the problem?)
Unloaded vehicle weight (GVWR) is 13,190#
Potential cargo of 3635#'s but with the axles being rated at 14,000#'s this limits me to a very small payload???
If I change out the ST235/80R16 E Range tires to ST235/80R16 G RATED tires will this boost the axles rating more than the 7000#'S Per axle better?
Why did Montana limit the trailer by not using the proper axles and tires to fit the label they used on my trailer? Any help would be great as I am headed to Arizona on Sunday with new g-rated tires on my trailer after having a bad blowout.
Thanks,
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Old 09-24-2018, 04:34 PM   #11
carl n susan
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Be not afraid! Part of the RV weight (~3000 lbs) is carried on the pin and is supported by your truck.
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Old 09-30-2018, 04:01 PM   #12
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I have a 2007 Montana 3400rl. The aluminum wheels had a sticker that you could inflat to 110 lb. These are not after market wheels.
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Old 09-30-2018, 10:23 PM   #13
PSFORD99
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Originally Posted by jhs449 View Post
I have a 2007 Montana 3400rl. The aluminum wheels had a sticker that you could inflat to 110 lb. These are not after market wheels.

They are rated for 80 psi , if they are the same OEM wheels as I got on my 2008 3400 RL. They were rerated for 110 psi ,stickers were sent out, to be rerated later back to 80 psi. Most likely a liability thing.

After this rerating I went out ,and got the Goodyear G614's, to find out they were later rerated back to 80 psi. Well I ran them anyway at 90-95 psi for 6 years no issues, at present I am running the Sailuns S637's ,same psi 90-95 . Total now 8 years.



Certainly not telling you to do the same . If those wheels of yours have a sticker on them saying 110 psi ,and not stenciled into the wheel, then they started out at 80 psi rating, rerated to 110 psi, and rerated back to 80 psi.

On edit ,didn't realize I explained this on a previous post on this thread. Still very doubtful you have a 110 psi rated wheel, especially 2007
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Old 09-30-2018, 11:21 PM   #14
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My ‘08 Montana alloy rims have a rating of 110 psi. We installed G tires and have had no problems. 8000 + miles cross country and 3000 miles of additional trips over the last 2 1/2 years. My rims were labeled so I was comfortable with my decision. Maybe you can get more information from a local dealer or corporate. My rig is a 3000rk
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