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Old 08-11-2015, 07:29 PM   #11
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Join Date: Nov 2007
Location: Clayton, NC
Posts: 685
Everyone is making it so complicated. I have a Columbus 320 RS with Maxxis M8008 tires ST235/80R16; standard size.
Palomino, the people who manufactures OUR Columbus' state in writing to inflate tires to 80 psi, COLD. Don't worry about tire pressures changing when hot, only worry about what they are when cold.
So, to answer your question...80 psi cold. That's it. No formulas, no calculations, no weighing; though I do recommend weighing your rig after loading it up to get an idea on how much you got back there.
Good luck

2013 Palomino Columbus 320RS
2007 Dodge RAM 2500 6.7 Cummins
Reese 15K manual slider
M.I.L. in Florida for good!!
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Old 08-12-2015, 03:53 AM   #12
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Join Date: Feb 2013
Posts: 140
Originally Posted by Tireman9 View Post

If you have a Motorhome then doing the weight then look up the load to learn the minimum CIP then that's the normal approach but if you have a multi axle trailer you might ask yourselt why trailers seem to have so many more tire failures earlier in life than seen on Motorhomes. This even when LT type tires are used on the TT.

The reason is the significantly higher 'Interply Shear" force placed on the tires whenever you turn. The trailer tires are dragged around every corner or curve as they can't have their centers rotate about a centerline that points to the center of the turn radius.

This results in tire structural forces that try and tear the belts apart.

You can Google 'Tire Interply Sherar" if you want to see the engineering analysis.

If you choose to ignore this advice, I suggest you not bother to complain when you have a tread separation.
Thoug the tires get torn apart by the interply-sheer, the real damage was done before that by to much heat of the rubber at sertain parts of tire.
I dare to state that if the tire is new no damage is done to it by ply-shear.

Its about the same as people with AIDS when no medicine was yet found , they dont die of AIDS but for instance of Pneumonia wich they could not fight because the resistance was gone.

Forgive me this comparing, but for tires its the same , the resistence against the forces is lowered because sertain parts of rubber have become hardened because of to much heat , courced by to much heatproduction, by to much deflection for the speed. The then damaged rubber gets tore by the sideward forces by cornering.

Trailers behind Trucks with for instance 3 axles , mostly do stear , but even if they dont , those tires last several k-miles and they have the same forces by cornering.
But for those the pressures are kept higher even above AT pressure often done in Europe.

Ofcource this also gives lesser forces but still dont think the sideward forces alone do the damage. Its the rubber that stays intact by not getting to much heat.

This is my conclusion , ofcource others will prove me wrong here.

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pressure, tire

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