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Old 05-28-2014, 07:13 AM   #11
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No law that says an E rated tire HAS to be inflated to 80#. I have E's on my 1/2 T and run 35 in the front and 30 in the rear unloaded and it rides just fine. When towing they go to 60 front 65 in rear.

You folks don't want to overload the truck by a wide margin, but the tires don't make any difference. Unbelievable. JMO
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Old 05-28-2014, 08:54 AM   #12
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And don't forget that P-rated tires are to be de-rated 9% when mounted on trucks or SUVs.
Huh ??
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Old 05-28-2014, 10:26 AM   #13
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And don't forget that P-rated tires are to be de-rated 9% when mounted on trucks or SUVs. Your 2500# tires are actually only ~2275 but, yes, that exceeds your axle rated at 3850.
Huh ??
www.tirerack.com:
"...

Also consider that Special Trailer (ST), as well as Light Truck (LT) tires are fully rated for trailer applications. This means ST- and LT-sized tires can carry the full weight rating branded on the sidewalls when used on a trailer.

However when P-metric or Euro-metric tires are used on a trailer, the load capacity branded on the sidewalls must be reduced by 9%. This means P-metric or Euro-metric tires with a maximum branded load rating of 1,874 lbs. for use on a car is only rated to carry 1,705 lbs. when used on a trailer.

..."

That's a DOT reg that applies to SUVs and pickups, as well. At least, that's my understanding but I may have misread it elsewhere. If correct, manufacturers must use the reduced rating when calculating load capacity for SUVs and trucks. If your de-rated P tires exceed the rating of the axle, it's a moot point.

C, D or E tires do reduce squirm when towing. Unfortunately I was unable to find C or D (I preferred D) tires in the size I was looking for (245/70R17) so had to settle for LR-E. I'm satisfied with the result but am relegating my Durango to TV status, replacing it as a daily driver with a compact car. (DS graduated high school and I'm no longer transporting high school sport teams to meets.) If I were not retiring the Durango I might look further for LR-C or LR-D, or make other decisions.
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Old 05-28-2014, 11:01 AM   #14
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www.tirerack.com:

Unfortunately I was unable to find C or D (I preferred D) tires in the size I was looking for (245/70R17) so had to settle for LR-E. I'm satisfied with the result but am relegating my Durango to TV status, replacing it as a daily driver with a compact car. (DS graduated high school and I'm no longer transporting high school sport teams to meets.) If I were not retiring the Durango I might look further for LR-C or LR-D, or make other decisions.
The linked article refers to P rated tires on trailers, not on SUVs or trucks.

I too could not easily find C or D rated LT tires in my size, that is why I went with the Goodyear Wrangler SR-As in a P rated.
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Old 05-28-2014, 11:58 AM   #15
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The linked article refers to P rated tires on trailers, not on SUVs or trucks.
I acknowledged that in my post but recall (perhaps incorrectly?) reading elsewhere that it applies to SUVs and trucks, as well.
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Old 05-28-2014, 01:08 PM   #16
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Originally Posted by OldCoot View Post
No law that says an E rated tire HAS to be inflated to 80#. I have E's on my 1/2 T and run 35 in the front and 30 in the rear unloaded and it rides just fine. When towing they go to 60 front 65 in rear.

You folks don't want to overload the truck by a wide margin, but the tires don't make any difference. Unbelievable. JMO
OC, my F-150 has the max. towing package but not the HD payload package. The axles are rated at 3750# for the front and 4000# for the rear. My current P275/65R18 tires have a load rating of 2640# per tire (at 44 psi) so with 5280# per axle they are well over the capability of my axles.

What advantage am I going to get by spending an extra $300 on a set of LT tires when the P tires I have exceed the axle ratings, are more than stout enough for my towing needs and they are more compliant for daily driving?
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Old 05-28-2014, 01:36 PM   #17
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Some don't like the feeling of fish tailing even if it's not really happening.

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Old 05-28-2014, 01:44 PM   #18
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Some don't like the feeling of fish tailing even if it's not really happening.
By which you're referring to the squirm some describe when using P tires?
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Old 05-28-2014, 02:42 PM   #19
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Yes...

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Old 05-28-2014, 02:49 PM   #20
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Yes...
And in addition to the squirm, it causes premature wear. Ask me how I know! Put a set of GY Fortera's on my truck (over $1100) and got less than 30,000 miles on them even with 44# in them towing. Never again, but it's your money and your truck.
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