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Old 03-22-2015, 08:40 AM   #31
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Originally Posted by kandl View Post
If so, why do auto manufacturers market SUVs and light trucks, that specify significant tow capacities, come equipped with P-Metric tires? They're being negligent? The consumer is not being made aware by the vehicle manufacturer of the hazards associated with towing with a P-Metric tire? I don't get it. If the aforementioned tires are causal to hazardous towing conditions (sway), why the heck are they being fitted to potential tow vehicles.
The overwhelming majority of SUVs are never used for towing and the mfgrs cater to the majority. The P tires will carry the loads, but with the more flexible sidewalls they will exhibit "squirm" with the load. I have tried the P tires (GY Fortera) on my truck and I can tell you they will hold the load and I didn't get any noticeable squirm with 44# of air in them, but they did wear out much, much faster (Less than 30k and worn bad). Went to LR E and after 30k, they still look like new.

I would not tow on any P tire.
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Old 03-22-2015, 08:57 AM   #32
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I run the PSI listed on the sidewall of the Coopers towing or not because there is nothing on the tire that says to do other wise.

Underinflated tires is one of the main reasons tires fail I will not run the risk of wrecking a 160 dollar tire or my truck by underinflating it.

Run the pressure on the sidewall of the tire, it IS the safe thing to do.
So do you run 80 psi all the time
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Old 03-22-2015, 09:05 AM   #33
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On my LR E's I run 65#F/R loaded and 35#F, 30# R unloaded. Over 30K on tires and they look like new, but most of the mileage has been loaded pulling the 5er.
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Old 03-22-2015, 09:17 AM   #34
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Originally Posted by OldCoot View Post
The overwhelming majority of SUVs are never used for towing and the mfgrs cater to the majority. The P tires will carry the loads, but with the more flexible sidewalls they will exhibit "squirm" with the load. I have tried the P tires (GY Fortera) on my truck and I can tell you they will hold the load and I didn't get any noticeable squirm with 44# of air in them, but they did wear out much, much faster (Less than 30k and worn bad). Went to LR E and after 30k, they still look like new.

I would not tow on any P tire.
I agree. It is not totally a load carrying capacity situation. It is also about side wall stiffness and controlling "movement".
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Old 03-22-2015, 09:22 AM   #35
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So do you run 80 psi all the time
Yes I do.
Discount tire has done a great job of keeping the tires aired and rotated.
Yes it does ride like a truck, but I do not mind.
I am ready to hook and go with no time out to air the tires up.
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Old 03-23-2015, 02:26 AM   #36
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Thanks for to much info This is what I found out. My current tires Good year wranglers P275/65 /R18 have max load 2601. The tires I am looking at Cooper A/T3 C's have a max load of 2335. E's max load is 3415. So if I am thinking right my current P tires 4ply hold more then cooper C tires 6 ply. So if I want to get rid of the squirmy swaying problem I have to move up to E range no??. Or I just keep my current tires ???
A lot of people get bad information about their truck tires load capacity (even from tire dealers).

Passenger tires - any kind or design - MUST have their load capacity de-rated for use on Light Trucks. So your figure of 2601# for your OE tires is really 2364#. Vehicle manufacturers will automatically apply the reduction when fitting OE tires on the truck. The standard reduction is the value of the tireís maximum load capacity found on the sidewall divided by 1.1.

ST & LT tires use the Load Range lettering system to figure tire load capacities. Passenger tires use the load index numbering system to figure tire load capacities. The two systems are not compatible.

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p.s. Your replacement tires should have the capability to carry the load established with the OE tires (2364#).
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Old 03-23-2015, 04:30 AM   #37
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The overwhelming majority of SUVs are never used for towing and the mfgrs cater to the majority.
I get that - soccer moms appreciate that plush ride in the two and a half ton big iron thing. However, said vehicle, equipped with P-Metric tires, is specified by the manufacturer as being capable of towing an X thousand lb tt. Based on the frequent refrain in this forum that P designated tires contribute to trailer sway, it would be safe to assume that the vehicle manufacturer is potentially... negligent?

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I would not tow on any P tire.
I appreciate and respect that. My experience differs.
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Old 03-23-2015, 04:51 AM   #38
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Passenger tires - any kind or design - MUST have their load capacity de-rated for use on Light Trucks. So your figure of 2601# for your OE tires is really 2364#. Vehicle manufacturers will automatically apply the reduction when fitting OE tires on the truck. The standard reduction is the value of the tireís maximum load capacity found on the sidewall divided by 1.1.
So... is the dealer/seller obligated to inform me that the light truck's tire load capacity is not what is molded into the sidewall of the tire?
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Old 03-23-2015, 05:25 AM   #39
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A lot of people get bad information about their truck tires load capacity (even from tire dealers).

Passenger tires - any kind or design - MUST have their load capacity de-rated for use on Light Trucks. So your figure of 2601# for your OE tires is really 2364#. Vehicle manufacturers will automatically apply the reduction when fitting OE tires on the truck. The standard reduction is the value of the tire’s maximum load capacity found on the sidewall divided by 1.1.

ST & LT tires use the Load Range lettering system to figure tire load capacities. Passenger tires use the load index numbering system to figure tire load capacities. The two systems are not compatible.

Airdale


p.s. Your replacement tires should have the capability to carry the load established with the OE tires (2364#).
And I would be that tire dealer. You are absolutely correct and I knew that but totally forgot it when posting. Thanks for posting the correct information.

I went back and edited my original post to reflect this for future.
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Old 03-23-2015, 06:12 AM   #40
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B and B what psi do you run? And are they the factory rims
Hello, I have 20 inch wheels and run 65 psi. Based upon loading this is plenty with Nitrogen fill.
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