80 psi rims

[offroad71]

Is there any problem running G614 on 80 psi rims? Everybody seems to be running at 110 psi. Would like to upgrade the Marathons, but not the rims.

[hunts800]

As I understand it, only option is to upgrade rims. I. Don't think anyone runs G614's at 80 PSI.

[1retired06]

G load tires run on higher PSI. If you do not want to upgrade your rims (essential), move to a good quality LT tire as a cheaper option

[DQDick]

You don't say what model of Monty you have or how much it weighs. A good LT tire is probably what you need, depending on how much weight your putting on each tire. I wouldn't try to run G614's on 80# rims no matter what.

[BB_TX]

There have been several good E rated LT tire options listed here in the past. I don't remember the brands though.

Depending on your trailer weight, the Michelin XPS Rib is a great tire. Have had mine for 6 years and about 19,000 miles. No age cracks and still look virtually new. Will age out long before they wear out. But they are only rated for 3,042 lbs (if I remember right), less than the 3,400+ or so of the original STs. But that is fine for my trailer. I think some of the other brands have a higher weight rating.

Don't blame you on the Marathons. Good friend had 3 Marathons blow out in one summer.

[Bama Camper]

quote:Originally posted by offroad71

Is there any problem running G614 on 80 psi rims? Everybody seems to be running at 110 psi. Would like to upgrade the Marathons, but not the rims.

According to Goodyear, the G614 is rated to run down to 75PSI with a reduced load max load rating, so yes, it can be run that low. I wouldn't do it, particularly on a tandem axle trailer where you drag the wheels sideways in a tight turn, but yes it can be run that low.

Offroad71 - with regards to the rims, see the thread here titled "another rim upgrade question". See my last post on that thread. It could be that your rims will run at a higher pressure than you think. That is, of course, unless you KNOW they are 80 PSI rims.

[CalandLinda]

Here's the GY load inflation chart.

http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

Cal

[Irlpguy]

The maximum load rating of a 235/85R16 tire is shown in the chart as 3042 lbs at 80 psi or an E rated tire. That is the same as you would get with a good LT tire for a lot less money. Unless your RV is one of the heavier ones I would not even consider going to the G614's and run them that far below their max cold rating, you are gaining nothing.

As has been suggested if your weights are in line then go with a good LT tire, I believe the G614 would suffer inflated as low as 80 lbs.

Just my opinion I am no tire expert.

[commish]

We have LT tires on our 3295RK and they have done well.

[offroad71]

I have 2009 3000RK, Dry weight 10560 carrying weight 3650. The Marathons are 235/80r16 E rate at 3420 at 80 psi. Have not weight the unit for weight on each axle.

[Ozz]

The reason they don't OK the high pressure tires is because the rim company does not have the molds anymore to get certification for them, years ago the rim company (Treadit) was issuing stickers to affix to the 80# rims stating they were Ok for 110#
Their Legal department told them to stop, as they couldn't make another rim because of the mold being gone for testing, but Treadit said they were (probably Ok) for high pressure tires.
I just bought new high pressure rims and the new Goodyear tires.
My advice would be to get the high pressure rims with the tires, too much is at stake to gamble.

[CalandLinda]

Rim specifications are managed by the SAE. However, the DOT places their selection and use in the hands of the tire manufacturers as the excerpts from FMVSS regulations demonstrate below.

FMVSS 571.120;
S5.1.1Except as specified in S5.1.3, each vehicle equipped with pneumatic tires for highway service shall be equipped with tires that meet the requirements of § 571.109, § 571.119 or § 571.139, and rims that are listed by the manufacturer of the tires as suitable for use with those tires, in accordance with S4.4 of § 571.109 or S5.1 of § 571.119, as applicable.

Cal

On edit: Motorized vehicle manufacturers will at times waver from a rim's specifications for handling, speed restrictions...etc... I cannot find any logic for rims for RV trailers to have their specification manipulated.

[Ozz]

Here is a link to an old post where Jennifer from Treadit was passing out stickers, after that, they stopped doing that.

http://www.montanaowners.com/forums/...hTerms=Treadit

[ckwizard]

quote:Originally posted by Ozz

Here is a link to an old post where Jennifer from Treadit was passing out stickers, after that, they stopped doing that.

http://www.montanaowners.com/forums/...hTerms=Treadit


According to this the wheels on my 08 may be able to handle 110 psi

[PSFORD99]

quote:Originally posted by Ozz

The reason they don't OK the high pressure tires is because the rim company does not have the molds anymore to get certification for them, years ago the rim company (Treadit) was issuing stickers to affix to the 80# rims stating they were Ok for 110#
Their Legal department told them to stop, as they couldn't make another rim because of the mold being gone for testing, but Treadit said they were (probably Ok) for high pressure tires.
I just bought new high pressure rims and the new Goodyear tires.
My advice would be to get the high pressure rims with the tires, too much is at stake to gamble.

I believe there are several members here on THIS FORUM that got led down that path, stickered rims rerated to 110 psi. I was included in that bunch. Learning after I purchased the G614's that now my rims are only rated for 80 psi .

[bshgto]

just out of curiosity I tried find wheel failures due to over pressure on several forum boards, found none. just a couple of failures from cracks on the splines from pot holes or curbs but none on the main body that holds the air, one guy had a pin hole that leaked air over time but that`s it. From what I gather it`s more of a application issue than the ability of a particular wheel to hold higher pressures (limits to that I`m sure )This is what a major distributor of trailer wheels and tires says when a guy wanted to upgrade his tires to stronger ones and posed the question about using 110 lbs tires ( GY 614 )on a trailer that came with 80 lbs E load range tire. 6 lug rims not 8 lug I think this is where the confusion comes into play.I spoke with one of the engineers at HWT and he told me that the psi rating for an HWT wheel and tire assembly is only limited by the valve stem and tire. If your current wheels or new wheels have a psi rating under 110 psi, it is okay to use tires with a 110 psi rating as long as you are using a metal valve stem that can handle 110 psi.

[PSFORD99]

quote:Originally posted by bshgto

just out of curiosity I tried find wheel failures due to over pressure on several forum boards, found none. just a couple of failures from cracks on the splines from pot holes or curbs but none on the main body that holds the air, one guy had a pin hole that leaked air over time but that`s it. From what I gather it`s more of a application issue than the ability of a particular wheel to hold higher pressures (limits to that I`m sure )This is what a major distributor of trailer wheels and tires says when a guy wanted to upgrade his tires to stronger ones and posed the question about using 110 lbs tires ( GY 614 )on a trailer that came with 80 lbs E load range tire. 6 lug rims not 8 lug I think this is where the confusion comes into play.I spoke with one of the engineers at HWT and he told me that the psi rating for an HWT wheel and tire assembly is only limited by the valve stem and tire. If your current wheels or new wheels have a psi rating under 110 psi, it is okay to use tires with a 110 psi rating as long as you are using a metal valve stem that can handle 110 psi.

Thats actually what I did, metal valve stems, and 95-100 psi depending. I have had the G614's on the derated rims now for nearly 5 years. No issues, no cracks ,no air loss etc. Probably run them for another two years, and go to the Saillun S637 .

[bshgto]

Just to take this a little further I decided to call Tredit the distributor of my 6 lug 3520lb wheels and ask them the same question,the answer was the same just change the valve stem and don't go over the load rating of the wheel, she added we do this all the time when people come in and want to use a stronger tire to try and prevent blowouts but don't want to buy new wheels . of courses just because you upgrade your tire capacity doesn't mean you can add more weight to your camper one must adhere to the weakest link in the chain,the axle rating or the load capacity of the unit.This all just my opinion only of course.

[Bama Camper]

quote:Originally posted by bshgto


just out of curiosity I tried find wheel failures due to over pressure on several forum boards, found none. just a couple of failures from cracks on the splines from pot holes or curbs but none on the main body that holds the air, one guy had a pin hole that leaked air over time but that`s it. From what I gather it`s more of a application issue than the ability of a particular wheel to hold higher pressures (limits to that I`m sure )This is what a major distributor of trailer wheels and tires says when a guy wanted to upgrade his tires to stronger ones and posed the question about using 110 lbs tires ( GY 614 )on a trailer that came with 80 lbs E load range tire. 6 lug rims not 8 lug I think this is where the confusion comes into play.I spoke with one of the engineers at HWT and he told me that the psi rating for an HWT wheel and tire assembly is only limited by the valve stem and tire. If your current wheels or new wheels have a psi rating under 110 psi, it is okay to use tires with a 110 psi rating as long as you are using a metal valve stem that can handle 110 psi.

and...

Just to take this a little further I decided to call Tredit the distributor of my 6 lug 3520lb wheels and ask them the same question,the answer was the same just change the valve stem and don't go over the load rating of the wheel, she added we do this all the time when people come in and want to use a stronger tire to try and prevent blowouts but don't want to buy new wheels . of courses just because you upgrade your tire capacity doesn't mean you can add more weight to your camper one must adhere to the weakest link in the chain,the axle rating or the load capacity of the unit.This all just my opinion only of course.

This is consistent with the information from two reputable tire vendors and a Goodyear representative. Both of the vendors said they had never seen a rim failure due to overpressure (on a single piece rim). One had been in business over 30 years, the other 22 years. My research into this question and the resulting information is in the folder named "another rim upgrade question" earlier in this thread.

Max load ratings are stamped on the rims, but maybe that's why Tredit doesn't stamp max PSI ratings on some of their rims anymore.

I ran 100 psi in my G614s for around 3500 miles without problems. But I have recently reduced the pressure to 90 psi to provide for a softer "ride" after referring to the tire loading chart and realizing 90psi still gives me plenty of headroom on my max load.

[bshgto]

I didn't add this to my previous post about my Tredit wheels. Another question I ask them was why is there no psi rating on the wheel although there is a space for it that says psi but no numbers but there is a stamped weight rating on one of the other splines. I was told psi max is not the issue,the weight you put on it is. I just laughed said thank you and finally hung up.