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Old 12-18-2012, 06:18 AM   #15
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If you will kindly read the sidewall of a Michelin LTX (P) 235/75R15 XL tire, your supposition on loads and pressures will be found in error. The maximum load of 2,183 pounds is at 50 psi. This is not from some table, but the actual tires on my trailer. The 10% derating is from a Federal rule which then says for calculations, one uses 1,985 pound maximum load.
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Old 12-18-2012, 10:00 PM   #16
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It seems that lot’s of posters on the subject of replacement tires in this forum avoid compliance with federal regulations.

The statement below is a verbatim copy from the current regulation for trailers less than 10,000#.

S4.2.2.1 Except as provided in S4.2.2.2, the sum of the maximum load ratings of the tires fitted to an axle shall not be less than the GAWR of the axle system as specified on the vehicle's certification label required by 49 CFR part 567. If the certification label shows more than one GAWR for the axle system, the sum shall be not less than the GAWR corresponding to the size designation of the tires fitted to the axle.

NHTSA amends that with a safety standard that says replacement tires must be of the same size and equal or greater load capacity than the OE tires. Or, something else recommended by the vehicle manufacturer.

Michelin, Firestone, Bridgestone, Goodyear etc..etc.. View replacing OE ST tires with P or LT tires as a misapplication thus voiding any warranty coverage (s) for such applications.

Maybe some homework will provide replacement tires from other options, especially with a vehicle manufacturer’s recommendation.

On another note. CapriRacer IS a tire expert and has access to current T&RA manuals. I expect his figures to be correct when it comes to load inflations and tire pressures.

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Old 12-19-2012, 01:22 AM   #17
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Quote:
Originally Posted by BlackAces View Post
It seems that lotís of posters on the subject of replacement tires in this forum avoid compliance with federal regulations.

...

Michelin, Firestone, Bridgestone, Goodyear etc..etc.. View replacing OE ST tires with P or LT tires as a misapplication thus voiding any warranty coverage (s) for such applications.
My Airstream came originally with Michelin LT tires back in 1971, and seems to work with the new set I put on a couple of years ago just fine.

Given that we're picking tires capable of the maximum load rating of our trailer axles, just how are we avoiding "compliance with Federal regulations"?

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