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Old 01-04-2013, 10:14 PM   #71
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Name: Jack
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In post 65 above, 1630lbs. should read 1560lbs as the individual tire load on my trailer as weighed recently.

The example from aircraft tires does a pretty good job of clarifying the piece of the elephant that I (and perhaps others) are struggling with. I may have to accept Floyd's and your view, Jerod, that I should just dynamite to max psi and have done; in fact that is what I've been doing. Maybe it's a quibble but I had a heck of a time with the idea of the "minimum" tire pressure as presented by Brian and Floyd. However, I am willing to give back the goats and call it a nite and an end to my participation in this thread (except for the bounce test at 43 and 50psi). Probably have bad dreams after they've "rolled" at the lower pressure, even for five miles.

jack
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Old 01-04-2013, 10:30 PM   #72
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. . .and an elephant's faithful 100%. I'll backtrail thru your posts and check the pdf. Thanks.

jack
I doubt you'll hear a Who, but then nobody(but us) believes in them anyway.

While I am not claiming Discount Tire as the definitive authority,I did find the following page from their web site to be interesting reading.
Note the admonition in the left margin, it is the same as the one given by Carlisle Tire Company.
Trailer Tire Facts - Discount Tire
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Old 01-05-2013, 10:14 AM   #73
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When I bought my new tires for my Scamp the tire dealer had filled the tires to 65 lbs PSI and told me to run them at the maximum air pressure listed on the sidewall of the tire (65 lbs PSI) . I also called the tire manufacturer and was told to run the tires at the maximum air pressure of 65 lbs. PSI . So I went to the Discount Tire website Floyd linked in his post and they say run the tires at the maximum pressure as listed on the tire. I do not understand all the discussion over tire pressure it seems a rather nuanced point
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Old 01-05-2013, 01:57 PM   #74
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Originally Posted by Francesca Knowles View Post
There's more to it, but since this is beginning to sound more like a church service than a discussion <cut> Francesca
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Originally Posted by steve dunham View Post
I also called the tire manufacturer and was told to run the tires at the maximum air pressure of 65 lbs. PSI . So I went to the Discount Tire website Floyd linked in his post and they say run the tires at the maximum pressure as listed on the tire. I do not understand all the discussion over tire pressure it seems a rather nuanced point
Both points worthy of an amen from me
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Old 01-05-2013, 02:57 PM   #75
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Originally Posted by Francesca Knowles View Post
Thanks for the catch on my "Michelin" blooper, Brian- fixed on edit!

Per exceeding stamped maximum sidewall pressure:

It should be noted that the bulletin does specifically caution against exceeding the PSI limit of the wheel that the tire is mounted on.

I wonder how many folks even know that there is such a number?

Since it's usually stamped on the tire-bearing surface, demounting the tire is required to see it...

Francesca
This is particularly important if you have 15" wheels & are considering Maxxis's D rated 205/75/15 as a replacement for C rated tires. A number of forums have discussed replacing Marathons with Maxxis 8008 tires.

I checked with Escape & the rims supplied with my Escape 17 are rated for 50 psi. Maximum pressure for the Maxxis D rated tire is 65 psi, well above the rim rating.
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Old 01-05-2013, 08:33 PM   #76
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It's a lit-tle more than that when it comes to tires, Brian-me-lad...
"S" and "T" are indeed just a couple of letters in the name of the tire. It could just as well have been called "X999 ABC", or "Francesca".

ST as the first two characters of the tire's size/type designation have the specific meaning of compliance with the Tire and Rim Association's ST standards... and the designation of that infamous tire with "S" and "T" in its name (Goodyear's G614 RST) does not start with "ST" and it does not follow TRA ST standards (it starts with LT because it does follow TRA LT standards).

From the same Goodyear commercial collection, the G171 LT and G149 RSA LT do not follow TRA LT standards... but why would they, since "L" and "T" are just letters in the names.

Perhaps the lesson here is to read the specs, and not make assumptions based on model names or other marketing fluff.

Quote:
Originally Posted by Francesca Knowles View Post
For one thing, those labeled "ST" must also be labeled with the maximum speed limit of 65 mph...
Almost correct, and probably one reason that there are non-ST options suitable for trailers.
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Old 01-05-2013, 09:54 PM   #77
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Originally Posted by Brian B-P View Post

Perhaps the lesson here is to read the specs, and not make assumptions based on model names or other marketing fluff.
Much better to make those assumptions based on the apocryphal blather one reads in trailer forums, eh?

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Originally Posted by Brian B-P View Post
there are non-ST options suitable for trailers.
WHEW!
It took awhile, but you've finally come a-l-l-l-l the way back around to my original question:

Which tires other than ST's does a manufacturer specifically recommend for trailer use?

Other than the tire that Goodyear itself defines as a Commercial Trailer Tire but sticks the according-to-you meaningless letters "LT" on the sidewall, I mean. On that subject, perhaps you won't mind confining the offerings to those that do NOT require rims capable of enduring 110 pounds of pressure as does your first suggestion....

Francesca

P.S.:

I wish I knew how to post the "Word Cloud" the following excerpt made- it's very instructive! That cunning use of bold combined with withering sarcasm...
Quote:
Originally Posted by Brian B-P View Post
"S" and "T" are indeed just a couple of letters in the name of the tire. It could just as well have been called "X999 ABC", or "Francesca".
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Old 01-05-2013, 10:04 PM   #78
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I emailed maxxis to get their take on it. I also don't get 65 p.s.i. trailer wheels, that seems ridiculous. I never even considered that a possibility. I emailed ultra to see what mine are rated for. I'm going to be terribly peeved if they made trailer wheels that can't take the pressure of a trailer tire.
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Old 01-05-2013, 10:17 PM   #79
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I assume you already tried looking at Ultra's site online...I don't see any information there other than some real purty pictures (assuming I'm looking in the right place)...weird!

You'd think that PSI limits would be an important bit of info for shoppers!

I'll be interested to hear what you find out.

Francesca
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Old 01-06-2013, 12:21 AM   #80
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Originally Posted by Francesca Knowles View Post
Much better to make those assumptions based on the apocryphal blather one reads in trailer forums, eh?
No, better to read the specifications.

Quote:
Originally Posted by Francesca Knowles View Post
Other than the tire that Goodyear itself defines as a Commercial Trailer Tire but sticks the according-to-you meaningless letters "LT" on the sidewall, I mean.
Francesca, do read all of the words of any post? The LT that starts the designation is the meaningful part - not some random letters picked out of the name - because that leads to the correct specs... as I have posted several times.

Quote:
Originally Posted by Francesca Knowles View Post
On that subject, perhaps you won't mind confining the offerings to those that do NOT require rims capable of enduring 110 pounds of pressure as does your first suggestion....
Read my posts: I didn't suggest any tire for anyone, just listed an example of a tire which is suitable for trailer use, is not ST type, and is specifically LT type.
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Old 01-07-2013, 01:22 PM   #81
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Well, I have a reply from maxxis. I'm quite surprised.


Jared,
According to the Tire and Rim Association the inflation pressures and load specifications in general for any ST Radial trailer tires, regardless of the manufacturer, are designed and rated at 65 MPH. However, if the speed is higher than 65 MPH, the pressure and load need to be adjusted according to the following guidelines:
From 66 to 75 MPH &ndash; the tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) but requires no load adjustment.
From 76 to 85 MPH &ndash; the tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) and load should be reduced by 10%.
ST (Special Trailer) Radials are designed specifically for use on trailers. They have different construction features and materials that vary from Auto and/or Light Truck tires. There are no merits in using a Light Truck tire over an ST Radial if the intended use is for a trailer. Maxxis would not recommend any tire be used in any application it was not designed for.
Thanks for your inquiry and interest in Maxxis Tires.
Best Regards,
The Maxxis Support Team

So, under the right conditions, maxxis ok's their ST tires up to 85mph, which is enough for me. Maybe I need to get maxxis st's for the camper, and put the cheap Chinese st's on the car trailer. Decisions&hellip;

I'm not bothering to email the manufacturer of the tires on the camper now, I wouldn't trust their reply, or be able to read it, I'm sure.
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Old 01-07-2013, 01:41 PM   #82
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Good for you for going to the "horse's mouth", Jared.

Any word from the rim maker as to PSI limits on the wheels you bought?

Francesca
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Old 01-07-2013, 01:44 PM   #83
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Quote:
Originally Posted by Jared J View Post
From 66 to 75 MPH &ndash; the tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) but requires no load adjustment.
From 76 to 85 MPH &ndash; the tire inflation pressure needs to increase 10 PSI (not to exceed the maximum PSI the tire is rated for) and load should be reduced by 10%.
...

So, under the right conditions, maxxis ok's their ST tires up to 85mph, which is enough for me.
Sure, but for 85 mph those "right conditions" clearly include a tire rating high enough that your load is no more than 90% of the tires standard capacity at 10 psi less than the sidewall maximum.

Using Jack's example:
  • ST205/75R14, load range C
  • maximium inflation pressure: 50 psi
  • standard tire capacity at 50 psi: 1760 lb
  • standard tire capacity at 40 psi (to allow 10 psi extra inflation for higher speed): 1530 lb
  • tire capacity at 40 psi reduced by 10% (to allow for even for higher speed): 1377 lb

Is that enough for you? It is far too low for the 3120 lb on Jack's axle, but I don't think he's towing this fast and the point here is just to illustrate the application of the adjustments for higher speed with an ST tire.

Capacity values from the standard ST load/inflation table
  1. as published by Goodyear and linked to their RV Tire Inflation / Loading page, and
  2. as published by Maxxis and linked to their trailer tire page
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Old 01-07-2013, 01:59 PM   #84
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Apropos of Brian and Jared, one or less variable at a time is all I'm capable of pretending to deal with. Good thing I'm a moseyin old fool who's happy trying to stay alive at fifty-five!


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