Tire inflation

[float5]

Originally Posted by thoer

Just curiosity.

When I bought Carlisles I did some reading on their website and never saw that statement about denying warranty if not inflated to maximum pressure. I was then wondering how they would ever be able to determine exactly what pressure someone was running in their tire so that they could then deny warranty coverage.

Well, I guess if a person did not know that something was required for warranty --- which is quite common for many products because people do not read the manuals --- then the company merely asks what they did and they say!

In the case of a tire, if a vehicle were brought in with a problem, it might be found that the tires were not inflated to the correct pressure.

[elongest]

Good Year provides a load/inflation chart for their Endurance ST tires.
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

[thoer]

Originally Posted by float5

In the case of a tire, if a vehicle were brought in with a problem, it might be found that the tires were not inflated to the correct pressure.

Seems like that would be pretty tough to do with a failed/flat tire, baring some sort of very sophisticated/expensive forensic type investigation...

(But probably a mute point as I can find no such specific statement stating that the warranty will be denied if not run at maximum pressure on Carlisle's website.)

[phalaney]

Originally Posted by thoer

Just curiosity.

When I bought Carlisles I did some reading on their website and never saw that statement about denying warranty if not inflated to maximum pressure. I was then wondering how they would ever be able to determine exactly what pressure someone was running in their tire so that they could then deny warranty coverage.

"Max pressure" seems to be the operable phrase. And I can also see how it's a good idea to follow tire manufacturers recommendations. I.e. ALL of them, not just the one, qualified, number on the sidewall

I am sure that this, and similar threads usually "go nowhere". But I am also sure that Escape reps read them. They are, arguably, more important than cabinetry choices (sorry dear). So, I wish that ETI would huddle up and chime in. As I said, we're gonna ask about this during our orient next month...

[thoer]

Bob, I didn't talk to Reace about it when we just picked up the 21, but when we picked up our 17, he suggest running at about 45-47# on the 17 if my old memory is correct.

Please let us know what they have to say at ETI when you ask. But given the modern idea that everything should be settled with lawsuits, they may just refer you to the tire manufacturer. It's what I'd do to cover my posterior!! What we really need is a trailer tire engineer posting here.

[float5]

Originally Posted by thoer

Seems like that would be pretty tough to do with a failed/flat tire, baring some sort of very sophisticated/expensive forensic type investigation...

(But probably a mute point as I can find no such specific statement stating that the warranty will be denied if not run at maximum pressure on Carlisle's website.)

I was referring to the other tires. They would expect you had them all the same. Or if the others were all off, that perhaps put more load on that one. With a blowout, you would likely have the trailer there.

But again, if taking in one tire and a person has run tires that say 50 with 45 because they think that is fine, they would say when asked that it was at 45.

All of these product companies know very well what they often use to deny warranty claims and the customers usually do not.

[Chapitre]

I read something like that on E- trailer - to keep trailer tires at maximum pressure. Our Max is 50 - I keep them at 48, which gives a bit of leeway for warmer temps...the tires are barely worn and wearing evenly after 40,000 miles.

[float5]

Originally Posted by Chapitre

I read something like that on E- trailer - to keep trailer tires at maximum pressure. Our Max is 50 - I keep them at 48, which gives a bit of leeway for warmer temps...the tires are barely worn and wearing evenly after 40,000 miles.

Warmer temperatures are already accounted for. The 50 psi is a cold temperature pressure and the companies, of course, know that goes up with use.

[Iowa Dave]

Hi Eric
We had Marathon 205 14s on the 19. I ran them at 46 or 47 in the summer. I . checked them religiously ( on Saturdays). They had about 42K on them when I put the new ones on. The new Endurance Goodyears seem to be doing well for us on the 21. No problem with rim leaks on the aluminum rims. I'm running them at 63 lbs and they will gain a couple lbs on hot days. I haven't had them up to 87 mph yet but they've seen mid 70s on 500 mile days when I need to make some time. I like the tire pressure and temp monitoring system Jack left on the trailer when we picked it up. I take a few minutes a few times a year to pick deep stones out of the tread with an ice pick and keep my eye on the sidewalls inside and out. I put the feel to the tires and hubs when I stop for a break or for gazzzoline. Have a great day.
Iowa Dave

[padlin]

Originally Posted by elongest

Good Year provides a load/inflation chart for their Endurance ST tires.
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

5.0TA GVWR 2500kg or 5512lbs % 4 = 1250kg or 1378lbs

ST205/75R15 @ 1378 lbs = 31 psi

?

Sounds a wee bit low.

[phalaney]

Originally Posted by padlin

5.0TA GVWR 2500kg or 5512lbs % 4 = 1250kg or 1378lbs

ST205/75R15 @ 1378 lbs = 31 psi

?

Sounds a wee bit low.

Goodyear says to inflate to max AXLE load. I'm guessing that would be 3500#/2, or 1750#/tire. That being said, I fully understand why it was done that way. And a Cliffie Clavin, the intermediate kg s/b 625, not 1250. BD, the answer was correct....

[padlin]

Originally Posted by phalaney

Goodyear says to inflate to max AXLE load. I'm guessing that would be 3500#/2, or 1750#/tire. That being said, I fully understand why it was done that way. And a Cliffie Clavin, the intermediate kg s/b 625, not 1250. BD, the answer was correct....

Which is 50psi, that sounds better then 31.

[Brian B-P]

The load-inflation table leads to 47 psi for the ST205/75R15 to correspond to a 3500 pound axle rating (using a linear interpolation, which is appropriate). Escape 19' and 21' models before this year have a lower axle rating, and thus lower minimum inflation pressures (e.g. 2500 lb GAWR and 27 PSI, or 3000 lb GAWR and 36 PSI). None of the tandem-axle models need a 3500 GAWR, as they would all hit GVWR well before loading both axles to that point.

Tow vehicles (such as the Frontier which started this discussion) typically have substantially larger tires compared to the GAWR, so their appropriate inflation pressure is lower.

[Patandlinda]

Originally Posted by Brian B-P

The load-inflation table leads to 47 psi for the ST205/75R15 to correspond to a 3500 pound axle rating (using a linear interpolation, which is appropriate). Escape 19' and 21' models before this year have a lower axle rating, and thus lower minimum inflation pressures (e.g. 2500 lb GAWR and 27 PSI, or 3000 lb GAWR and 36 PSI). None of the tandem-axle models need a 3500 GAWR, as they would all hit GVWR well before loading both axles to that point.

Tow vehicles (such as the Frontier which started this discussion) typically have substantially larger tires compared to the GAWR, so their appropriate inflation pressure is lower.

What ? Haven't had my coffee yet . But you are saying our tires are to be 27 lbs ? Not what Escape sticker said and we usually had them at 48 lbs. Pat

[Brian B-P]

Originally Posted by Patandlinda

But you are saying our tires are to be 27 lbs ? Not what Escape sticker said and we usually had them at 48 lbs.

No, only that the minimum to carry the trailer's load (assuming that is kept within the axle ratings, and that those are 2500 pounds) is 27 PSI. Higher pressure - anywhere up to the maximum marked on the sidewall - is acceptable, but lower pressure would not be. Most people would want more than 27 PSI for optimal behaviour, and in this case the vehicle manufacturer (Escape) recommends 50 PSI (which is certainly higher than ideal for ride, and almost certainly higher than ideal for treadwear or traction, but safe).

[Patandlinda]

Originally Posted by Brian B-P

No, only that the minimum to carry the trailer's load (assuming that is kept within the axle ratings, and that those are 2500 pounds) is 27 PSI. Higher pressure - anywhere up to the maximum marked on the sidewall - is acceptable, but lower pressure would not be. Most people would want more than 27 PSI for optimal behaviour, and in this case the vehicle manufacturer (Escape) recommends 50 PSI (which is certainly higher than ideal for ride, and almost certainly higher than ideal for treadwear or traction, but safe).

Trailer rode pretty nice Brian . We have tire sensors and living here with very hot temps driving in the summer watched as tires pressurs rose sometimes a lot . We replaced tires even though tread was fine and tires were only by the date on tires less then 4 years . Had to fix a flat .Because I knew temps would rise why we started at 48 instead of 50 . Never drove over 60 usually 55 . Now with the Maxis D tires drive 60- 65 . Keep pressure 58-60 . Pat

[Brian B-P]

Originally Posted by Patandlinda

Trailer rode pretty nice Brian

The great thing about the ride of trailers is that no one rides in them, so they don't realize how rough it is. It is possible to adjust pressures and feel some difference, although the degree of roughness is better judged by stuff in the trailer (and best judged by an accelerometer in the trailer, but no one measures anything).

Originally Posted by Patandlinda

Now with the Maxis D tires drive 60- 65 . Keep pressure 58-60 .

Why use higher pressure with the Load Range D tires? They're the same size, and so do not need any more pressure to get the same behaviour.

I wonder if people would use 80 PSI if they could get this size of ST tire in Load Range E? The "always use maximum for trailers" philosophy would say to do exactly that.

[Jim Bennett]

Originally Posted by Brian B-P

I wonder if people would use 80 PSI if they could get this size of ST tire in Load Range E? The "always use maximum for trailers" philosophy would say to do exactly that.

I do. I have kept them at 80 psi for the 15 years I have been using them.

Funny, I just checked them today for the first time since replacing them a month or so ago, and 3 were still bang on from the shop, and one down only 2 psi. They never even asked me what pressure I wanted, just filled them to the max like they do with all ST tires.

[Patandlinda]

Originally Posted by Brian B-P

The great thing about the ride of trailers is that no one rides in them, so they don't realize how rough it is. It is possible to adjust pressures and feel some difference, although the degree of roughness is better judged by stuff in the trailer (and best judged by an accelerometer in the trailer, but no one measures anything).


Why use higher pressure with the Load Range D tires? They're the same size, and so do not need any more pressure to get the same behaviour.

I wonder if people would use 80 PSI if they could get this size of ST tire in Load Range E? The "always use maximum for trailers" philosophy would say to do exactly that.

Brian I have heard it is a Earthquake back there . I am going by watching trailer and never having any cabinet or refrigerator open up . Never tied the refrigerator or cabinet doors up .The f250 is a pretty big truck so I can watch trailer pretty good . I forget what the max pressure is on the Maxis tires but like the 58-60 . Again pressure in summer on the roads pressure really goes up . The Maxis tires are a lot heavier then the Carlisles were . So I have pressure up a little . Pat

[thoer]

Jim how did you manage to quote me on a post I didn’t make. Oh I know, it always Eric’s fault.....