Michelin Towing guide

[sonofagun]

I've seen a number of posts discussing tire pressure vs weight. I called Michelin and got a 29 page RV Tire Guide. Call 800-677-3322 option 2 to get a copy.

If I could figure out how to post them I would show you a couple of the pages. The book is worth the phone call.

Bob

[tanker]

Thanks Bob, I'm going to call them. I have looked at their website, but 265/75R16E are not listed in the tire pressure listing. I know my weights empty and loaded, so a chart will let me inflate to a proper rate for the load. smile.gif

[stolley]

Michelin's guide can be seen and printed from this site:
http://truckus.webmichelin.com/tires/RVTIREGUIDE1.pdf
It's a .pdf (Adobe Acrobat Reader) file

[sonofagun]

Stolley,

The actual guide is 29 pages long and all of the tire pressure vs weight info is at the back. The page you reference only has the first 13 pages (though the info found there is quite informative).

Bob

[stolley]

Oops! For the load/inflation charts go to:
http://truckus.webmichelin.com/tires/RVTIREGUIDE2.pdf

[tanker]

I wish they showed my tire size on that chart. I upgraded from the LT-245/75R16-LRE, to the LT-265/75R16-LRE tire. @80psi the 265's will carry 373 pounds more than the 245's. I would like to dial in a correct air pressure so that I get a smoother ride. Why run 80psi when I may be ok at 45-50psi empty, or 70psi loaded. :rolleyes:

[sonofagun]

Tanker,

The spread between the 235s and the 245s is zero. The spread between the 215s and those above is 13% for single and 12.5% for double.

I don' know if you could make the same assumption in going to the 265s. If so you would likely be wrong only by too much air and not to little.

IF this works the numbers would be:

55 60 65 70 75 80 (can't get these to line up but they are the pressures for the corresponding weights below)

D 2638 2808 2964 3002 3277 2835

S 2171 2300 2430 2565 2700 3437

These figures are awfully close to the single tire max of 3415 lbs. If you back my numbers down on the single from +13% to +12.4% you would be right on the max at 80 LBs. I don't know what the double capacity max is, so be sure it is at least 2835 as noted above, otherwise massage that down a bit too.

Don't know if this is right or if it helps but it is what I would use short of better data.

Good luck,
Bob

[ 12-12-2003, 02:23 PM: Message edited by: son of a gun ]

[sonofagun]

Thanks for page 2 Stolley

Bob

[MartyB]

Tanker,

I would be suprised if you ever need more than 65 lbs in any of the tires. I have run 10ply 265's the last 50K on my truck, including the trip out to Dayton, and I did not run more than 60 rear and front. I am going back to LR D's the next spring when I replace my current treads. I have needed the extra capacity maybe three times when loaded with rock. So I will save the ~$10 per tire and take out the sweetie to dinner. :D

Most of the time I am running 50-55 lbs in the rears, with the truck coming in at 2600-3000 lbs, depending upon the load, and 4200 lbs on the front with 55-60 typical inflation. I'll bump the rears to 60-65 when towing the TT or my equipment trailer with the bobcat etc on it.