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Old 08-02-2021, 09:18 AM   #57
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Quote:
Originally Posted by NeilV View Post
Over inflating tires beyond whats required to carry the load on them can be just as bad as under inflating them.

One comment based on Roger Marbles' blog.

For TOWABLE TRAILERS and I believe he means specifically multi-axle trailers, he recommended running at the max CIP to minimize inter-ply shear. The twisting strain put on the tires when making turns which can cause tread separation leading to a tire failure. I doubt many people pull their trailers far enough to have center of tread wear issues before the tire ages out.

Each person needs to decide if the marginally rougher ride caused by higher inflation pressure is worth the risk of a tire failure.
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Old 08-02-2021, 09:18 AM   #58
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For what it's worth, I had the tires mounted over the weekend. Here are some photos:





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Old 08-02-2021, 09:22 AM   #59
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Originally Posted by Marshalone View Post
When I towed my 5th wheel I was advised by several other 5th wheel owners that unless my tires were G rated I should not run faster than 65 mph. If I did, I risked blowing tires on a regular basis. I had G rated tires and don't know how true this is but if it is, most people are not aware as they pass me on the highways doing 70+ on the way to their destinations.
That was then this now. Back in the day almost all ST tires had max mph ratings of 65 or less.
Today it varies up to at least 87 mph.
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Old 08-02-2021, 05:27 PM   #60
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The tire manufacturer usually has an inflation chart base on the weight on the tire . Saliun which l have. Their chart shows about 80 lbs on a G rated tire relative to my axle weights . The tires do not over heat since l have a TPMS to monitor them . Get up to about 102 going 65 on a hundred degree day in the Valley . They are on 16 “ wheels . If you like riding on round bricks just keep them at 110 and your trailer will get beaten up . The sidewalls are stiffer on a G rated tire . So find the inflation chart for your tires and go by that . I doubt you have a 15 “ wheel to handle that much pressure . It should be stamped on the inside . Your tires are part of your suspension they need to flex enough to absorb road shock being transmitted to your trailer .
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Old 08-02-2021, 06:00 PM   #61
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Some are over thinking this !
Sounds like you’ve done the math -
Happy travels !
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Old 08-02-2021, 07:32 PM   #62
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Originally Posted by jacknife View Post
The tire manufacturer usually has an inflation chart base on the weight on the tire . Saliun which l have. Their chart shows about 80 lbs on a G rated tire relative to my axle weights . The tires do not over heat since l have a TPMS to monitor them . Get up to about 102 going 65 on a hundred degree day in the Valley . They are on 16 “ wheels . If you like riding on round bricks just keep them at 110 and your trailer will get beaten up . The sidewalls are stiffer on a G rated tire . So find the inflation chart for your tires and go by that . I doubt you have a 15 “ wheel to handle that much pressure . It should be stamped on the inside . Your tires are part of your suspension they need to flex enough to absorb road shock being transmitted to your trailer .

This thread has gotten kind of long, so I don't fault you for not having read it all, but I've stated I will not be running them anywhere near 110psi after obtaining the manufacturers load inflation chart for my tire. I even posted the chart earlier in the thread, if you're interested in taking a look.


My rims are rated at 80psi. I'll be running them no higher than that.
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Old 08-03-2021, 04:32 AM   #63
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But that pressure-rating was yust what suprisingly was not that important, only the maxload/ loadindex of tire.
But then again , it was sayd to you on telephone by a lady, and not a man .
Do you also know the maxload of rimm?

And a stiffer tire needs higher pressure for same load. Have to search for European lists of same sise tire, but if you would calculate the loadcapacity/psi lineair , as some do, and is in fact not that bad, the G-load lower loadcapacity/psi then the E-load.

So if you dont overload the 4900lbs GVWR ( only weighing will prove that), you need the about 90 psi, I calculated in my first post here, to give it the reserves it needs , for higher speed then 65mph, unequal load R/L, and inacurate pressure-reading, etc etc.
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Old 08-03-2021, 03:57 PM   #64
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In addition.

2830lbs/80 psi is 35.375lbs/psi
3525lbs/110psi is 32.045 lbs/psi.

So the G-load needs higher pressure to carry the same load.

And the rimm-maker stepped off the psi , and only went for maximum load.
When I, as non-profesional state something , people say, I rather trust the tire-or Rimm- makers information. Now the rimm-maker states something you did not expect, and you dont trust their information.

If you put your new tires on 80 psi, you can wait for tire-failure( if weight 4900 lbs), my advice still is 90 to 95 psi , for maximum reserve without bumping. This needs metal valves. Will look back at your pictures to check that.

Edit: could not see it on the picture, only saw green cap, but will not start the discusion on nitrogen-filling( oh, mayby I did now).
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Old 08-06-2021, 01:16 PM   #65
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JD, who runs the popular "Big Truck Big RV" Youtube channel, just posted a video about a new single axle cargo trailer he purchased, and he talks a bit about these 15" Transeagles in the video (he's purchased them to put on his new trailer).

In case anyone is interested: https://youtu.be/FrmECCoh4ho?t=180
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