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Old 06-20-2017, 05:57 AM   #1
Seven Gable
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Cougar 5th Wheel Rim Tire Pressure Rating

I am looking to replace the original tires that came on my Cougar 336 BHS. While the axle rating is only 5,200 lbs. I would prefer to go with the Goodyear G614 RST, LT235/85R16, load range G, 3750 lb capacity. The original tires are ST235/80R16, load range E, (3520 lbs at 80 psi).

The Goodyear load/inflation table for RV's states the LT235/85R16 is good for the following loading: 110 psi, 3750 lbs. at 80 psi. 3042 lbs. While even at 80 psi they are greater than the axle rating I would like to run them at least 90 psi (3300 lbs, 25% factor of safety over axle) or preferably 100 psi (3550 lbs rating, at original tires)

I have 2 questions.
1. Has anyone replaced the original tires with the G614 and what air pressure do you run?
2. And secondly, does anyone know the max air pressure the original rims are good for?

Thanks
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Old 06-20-2017, 06:00 AM   #2
Terry W.
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Look on the inside of the rim. That is where I found it on my rims.

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Old 06-20-2017, 06:53 AM   #3
Seven Gable
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I probably should. How hard was it to break down the tire? The trip to the tire shop is really out of the way.
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Old 06-20-2017, 06:57 AM   #4
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Just to clarify what Terry suggested, the load capacity of the rim is marked on one of the spokes on the hub side of an aluminum rim. If a steel rim, also on the hub side stamped on the rim or on a sticker. No need to dismount the tire from the rim.

The markings should be visible without removing the rim from the axle, just need to crawl under the rig with a flashlight.
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Old 06-20-2017, 07:32 AM   #5
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I looked on my rims and the only info. I found was a weight rating (in my case 1900 lbs), but no PSI rating. Not meaning to hijack the thread, but does anyone know what 1900 lbs. capacity means in terms of PSI? Or doesn't it really work that way? My tires are 14" LRC (50 PSI) and would like to move to a LRD (65 PSI?) in the near future. If the 14" rims won't handle it, then I would move to a 15" rim.
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Old 06-20-2017, 08:04 AM   #6
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Originally Posted by jeff57 View Post
I looked on my rims and the only info. I found was a weight rating (in my case 1900 lbs), but no PSI rating. Not meaning to hijack the thread, but does anyone know what 1900 lbs. capacity means in terms of PSI? Or doesn't it really work that way? My tires are 14" LRC (50 PSI) and would like to move to a LRD (65 PSI?) in the near future. If the 14" rims won't handle it, then I would move to a 15" rim.


Do you have steel rims made by Dexstar? I do and looked up the wheels online. Based on the information there I did the same tire upgrade you are planning.


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Old 06-20-2017, 08:11 AM   #7
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Do you have steel rims made by Dexstar? I do and looked up the wheels online. Based on the information there I did the same tire upgrade you are planning.


2016 Passport GT 2810BHS, 2016 F350 CC DRW

I believe they are aluminum rims, but I don't know who the manufacturer of them is. If I can figure this out, maybe I can find some info on-line.
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Old 06-20-2017, 10:26 AM   #8
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When I brought my Cougar home there was no marking on the rims. Had it 3 days before taking it to the tire shop where the spare was taken off the wheel and nothing found. An email to the wheel supplier was answered stating the wheels were rated to 80#. That was the 2016 303RLS just traded on the Montana. The Montana wheels are rated at 110 PSI.
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Old 06-20-2017, 10:51 AM   #9
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Originally Posted by jeff57 View Post
I looked on my rims and the only info. I found was a weight rating (in my case 1900 lbs), but no PSI rating. Not meaning to hijack the thread, but does anyone know what 1900 lbs. capacity means in terms of PSI? Or doesn't it really work that way? My tires are 14" LRC (50 PSI) and would like to move to a LRD (65 PSI?) in the near future. If the 14" rims won't handle it, then I would move to a 15" rim.

If your wheel is rated (stamped) at 1900 lbs. I don't think you can run the LRD tires at 65 psi on them. Anything said online won't supersede the number stamped on the wheel.

Everything I've read states that an LRD tire at 65psi is rated at 2040 lbs. which would overload your existing wheels. Maybe run them at 50 psi but then you don't gain anything over the LRC rated at something like 1760 if I recall. Maybe I missed something but that's what it looks like in my preliminary "looking around".
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Old 06-20-2017, 10:59 AM   #10
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Here are a few industry guidelines to help you make your replacement tire selection.

"Never choose a tire that is smaller in size or has less load-carrying capacity than the tire that came with the vehicle."

"Tires should always be replaced with the same size designation — or approved options — as recommended by the vehicle manufacturer."

"The correct tire size designated for your vehicle should always be verified with the information in your vehicle owner’s manual or on the tire information sticker."

With RV trailer tires it’s very important to gain load capacity reserves with your replacements. The very basic industry standard is to never use less load capacity then the OE tires provided. Why waste the money if you’re not going to take advantage of readily available load capacity reserves? You know, steel cased tires “zipper” rupture. If you ever have a chance, take a look at the diameter size of the steel cables used in the steel cased tire’s sidewalls. You won’t want to excessively flex them under normal circumstances.

p.s. Quotations are from a Michelin PDF.
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Old 06-20-2017, 11:29 AM   #11
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Originally Posted by Seven Gable View Post
I am looking to replace the original tires that came on my Cougar 336 BHS. While the axle rating is only 5,200 lbs. I would prefer to go with the Goodyear G614 RST, LT235/85R16, load range G, 3750 lb capacity. The original tires are ST235/80R16, load range E, (3520 lbs at 80 psi).

The Goodyear load/inflation table for RV's states the LT235/85R16 is good for the following loading: 110 psi, 3750 lbs. at 80 psi. 3042 lbs. While even at 80 psi they are greater than the axle rating I would like to run them at least 90 psi (3300 lbs, 25% factor of safety over axle) or preferably 100 psi (3550 lbs rating, at original tires)

I have 2 questions.
1. Has anyone replaced the original tires with the G614 and what air pressure do you run?
2. And secondly, does anyone know the max air pressure the original rims are good for?

Thanks
Just wondering why you want "G" rated tires on a 5er with only a 12,235# GVWR? With 5,300# axles, do you plan to exceed the GVWR, or just looking for best safest tire to advoid blow outs. I will assume the later, if so why not do as I did and just use LT truck tires? I have Yokohama YK-HTX 235/85-16E @ 3,042# each almost the total of the 12,360# GVWR of our 5er less about 2,600# pin and less the 10,000# on the tires. Same trouble free tire run on many tow vehicles.
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Old 06-20-2017, 12:24 PM   #12
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This is a standard sized wheel/rim for the RST steel cased tire.

http://sendelwheel.com/wheels/tr8.html
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Old 06-20-2017, 12:40 PM   #13
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The TR08 listed by CW is an 8 lug 6.5" wide version of the T03 that is typically installed on the Cougar. The T03 is available in multiple sizes, 14, 15 and 16" wheel diameters with 5 or 6 lug patterns. I believe the OP's rims are T03, 6" wide, 6 lug rims, rated at 3580 lbs @ 94 PSI. NOTE: They are not rated at 95PSI (to carry LR F tires at full capacity)> http://sendelwheel.com/wheels/t03sm.html

There is also a T03 16" diameter 6" wide 8 lug rim that is rated at 3580/94PSI.

Don't get into the "looks exactly like so it must be...." trap. There's a significant difference in T03 6 lug or 8 lug rims and the T08 8 lug version.
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Old 06-20-2017, 06:10 PM   #14
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^^this x2.
You may have to do some "deduction" if the wheel is stamped with only a weight rating and not a PSI rating. Compare that to an appropriate tire. Also it may me stamped 6Hxxxx, being 6 hole. My TO3 are stamped "6Hxxx" and "8Hxxx".
There are several other brands that look just like TO3.
I called Sendel about my 6 hole TO3. They said it would fail at 110 PSI.
If in doubt call the manufacturer.
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Old 06-21-2017, 07:19 AM   #15
Seven Gable
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Originally Posted by rhagfo View Post
Just wondering why you want "G" rated tires on a 5er with only a 12,235# GVWR? With 5,300# axles, do you plan to exceed the GVWR, or just looking for best safest tire to advoid blow outs. I will assume the later, if so why not do as I did and just use LT truck tires? I have Yokohama YK-HTX 235/85-16E @ 3,042# each almost the total of the 12,360# GVWR of our 5er less about 2,600# pin and less the 10,000# on the tires. Same trouble free tire run on many tow vehicles.
I am not looking for increased capacity per say. I am looking to replace the OEM tires with a proven fifth wheel tire with a greater load and temperature safety factor in an effort to eliminate blowouts when towing for extended miles in 90 - 100 degree temperatures on our wonderful roads. Ambient Temperature, Road condition and tire flex lead to problems on a marginal tire. While the OEM tire is rated at 3520 lbs they each have deformations in multiple places on the side wall. Technically they do not limit the load capacity and are not indicative of an eminent failure; they are indicative of a lower quality tire construction and possible problems, Based on all of the China Bomb stories I do not want to take a chance. The original tires on my 2010 Coachman 291BHS were 205..R14's. I flipped the axles and replaced them with 225..R15's. Why, same reason, better tire and a known load safety factor. (BTW, in subsequent years Coachmen went to 15" tires) ST tires have a minimal factor of safety in loading and temperature. LT tires have a much greater factor of safety and when properly loaded run cooler.

I do not want to reduce the load rating of the tire with a higher quality replacement tire, I want to maintain the load rating while increasing the quality of construction and capabilities.

The rims do not have a pressure rating. They do list a load rating of 3580 lbs.

Thanks to everyone for their input. I will call Keystone. Then the rim manufacturer. I may be looking at another tire. The Goodyear was the recommendation of the tire dealer (independent heavy truck, tractor & car tire dealer).
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Old 06-21-2017, 07:40 AM   #16
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An ST tire is calculated in its maximum load for speed of 65m /104km/h , while an LT tire is calculated in its maximum load for 99m/160 km/h.
So its a good choiche to use a G load LT tire with almost exact same sises to replace the ST tires.
If you calculate the maximum load for 80 psi for the G-load you have.
3750lbs X ( 80psi/110psi)^0.8= 2907 lbs ( this is the official European calculation for all kind of tires , I once got hold of and went running with)
The ST tire bares 3520 at that same 80 psi with even H/w division of 80 instead of 85. This is 3520/2907= 1,21 x maxload of G load LT.
But to give the tire the same deflection it would need the same pressure for the load or the same loadcapacity for the same pressure.
On an other RV forum I made a topic for that .
https://forums.goodsamclub.com/index...d/27477930.cfm.
And if in the end you want me to calculate a needed pressure, give the details ( most you gave already) and I will calculate a pressure range in wich your tires wont overheat, and no bumping.

Greatings from a "Dutch Pigheaded Selfdeclared Tirepressurre-specialist"
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Old 06-21-2017, 09:08 AM   #17
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Originally Posted by Seven Gable View Post
I am not looking for increased capacity per say. I am looking to replace the OEM tires with a proven fifth wheel tire with a greater load and temperature safety factor in an effort to eliminate blowouts when towing for extended miles in 90 - 100 degree temperatures on our wonderful roads. Ambient Temperature, Road condition and tire flex lead to problems on a marginal tire. While the OEM tire is rated at 3520 lbs they each have deformations in multiple places on the side wall. Technically they do not limit the load capacity and are not indicative of an eminent failure; they are indicative of a lower quality tire construction and possible problems, Based on all of the China Bomb stories I do not want to take a chance. The original tires on my 2010 Coachman 291BHS were 205..R14's. I flipped the axles and replaced them with 225..R15's. Why, same reason, better tire and a known load safety factor. (BTW, in subsequent years Coachmen went to 15" tires) ST tires have a minimal factor of safety in loading and temperature. LT tires have a much greater factor of safety and when properly loaded run cooler.

I do not want to reduce the load rating of the tire with a higher quality replacement tire, I want to maintain the load rating while increasing the quality of construction and capabilities.

The rims do not have a pressure rating. They do list a load rating of 3580 lbs.

Thanks to everyone for their input. I will call Keystone. Then the rim manufacturer. I may be looking at another tire. The Goodyear was the recommendation of the tire dealer (independent heavy truck, tractor & car tire dealer).
If this is your goal... go get you some Carlisle https://www.carlislebrandtires.com/o...adial-trail-hd that's what I did... and a whole bunch of other folks as well...
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Old 06-21-2017, 05:22 PM   #18
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If this is your goal... go get you some Carlisle https://www.carlislebrandtires.com/o...adial-trail-hd that's what I did... and a whole bunch of other folks as well...
Well I called the tire dealer and he agreed that they have had good luck with the Carlisle Radial Trail HD and he stocks them. Funny thing is I remember hearing about them but that was prior to purchasing this 5er.

Thanks! I will be using them.
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Old 06-21-2017, 05:38 PM   #19
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Well I called the tire dealer and he agreed that they have had good luck with the Carlisle Radial Trail HD and he stocks them. Funny thing is I remember hearing about them but that was prior to purchasing this 5er.

Thanks! I will be using them.
WalMart currently has some "bargain basement pricing" on Carlisle Radial Trail ST tires. Many tire dealerships will match the price. With free shipping to the store, WalMart is, at times, about half the price of some tire dealerships. Do some checking before you commit, you may find that you can get the tires for a substantial discount over some quoted prices at many tire dealerships.
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Old 06-21-2017, 07:49 PM   #20
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WalMart currently has some "bargain basement pricing" on Carlisle Radial Trail ST tires. Many tire dealerships will match the price. With free shipping to the store, WalMart is, at times, about half the price of some tire dealerships. Do some checking before you commit, you may find that you can get the tires for a substantial discount over some quoted prices at many tire dealerships.


There is a difference in the Carlisle that and newer hd tires. I never had a problem with Carlisle. If they made a LR g I'd be running them instead if Sailun, maybe, probably not.


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