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Old 03-21-2015, 11:09 AM   #11
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Originally Posted by Ford Idaho View Post
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 otherwise.
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.
This chart is what Goodyear puts out for different loads at different pressures which, if I understand it tells folks they can adjust the pressure and do not have to run max sidewall pressure.
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File Type: pdf 2010_loadinflation.pdf (7.77 MB, 48 views)
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Old 03-21-2015, 11:16 AM   #12
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This chart is what Goodyear puts out for different loads at different pressures which, if I understand it tells folks they can adjust the pressure and do not have to run max sidewall pressure.
Does that apply to ALL tires or just Goodyear?
If all tires would Goodyear stand behind their data in the event things went south?
If Goodyear tires only then that data is worthless for use with other brands correct?
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Old 03-21-2015, 11:20 AM   #13
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Does that apply to ALL tires or just Goodyear?
If all tires would Goodyear stand behind their data in the event things went south?
If Goodyear tires only then that data is worthless for use with other brands correct?
All tire companies put out the same type of charts.
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Old 03-21-2015, 11:29 AM   #14
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Cooper suggest what is on the door sticker.

Cooper Tire & Rubber Company - Proper Tire Inflation

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Driving on tires with improper inflation pressure is dangerous.
  • Under inflation causes excessive heat build-up and internal structural damage.
  • Over inflation makes it more likely for tires to be cut, punctured or broken by sudden impact.
These situations can cause a tire failure, including tread/belt separation, even at a later date, which could lead to an accident and serious personal injury or death.
Consult the vehicle tire placard, certification label or the owner's manual for the recommended inflation pressures.
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Old 03-21-2015, 11:47 AM   #15
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Don't think anyone is saying to run tire pressures less than the what is listed as recommended on the door post placard, which is always less than the max inflation pressure shown on the tire sidewall.

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Old 03-21-2015, 11:49 AM   #16
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Here is a website showing the load/pressure charts for all the major tire manufacturers. Tire_Info
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Old 03-21-2015, 12:55 PM   #17
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D or E. Better too much than too little.
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Old 03-21-2015, 12:55 PM   #18
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Howdy HIDE OUT, just some observations from my perspective of being in the tire biz. It may be hard to find a Load Range D tire in your sizing. Many manufacturers have really consolidated their passenger tire and light truck lines and have done away with Load Range D tires in many sizes. They usually make a SL (standard load or XL extra load), a Load Range C, and a Load Range E (for 3/4 tons and heavier). They are load range D's in some sizes though.

Even if your wheels will safely handle the air pressure of a Load range E tire at 80 psi, you don't necessarily have to run that much pressure which is going to be a stiff ride on a F-150, especially if you don't have a load connected to the truck. However, as heavy as a Load Range E tire will be, you also don't want to run it at too low a pressure, as it will heat up. The heavier the tire, the more energy (fuel) it takes to turn them too.

Now, there has also been some more changes of the years late, in the proliferation of passenger and light truck tires. You can't just necessarily assume that a Load Range C tire will carry more load than a P (either standard load or extra load) tire. This is what causes a lot of confusion too. I would advise to look at the Load Index number of each tire you are interested in, and it will define how much weight the tire is made to handle....and not necessarily just the ply rating if it has one. You could possibly find a SL tire that runs at 51 psi and handles more weight, as compared to a Load Range C tire at 50 psi.

Did I help or confuse the issue even more?

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 ???
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Old 03-21-2015, 01:56 PM   #19
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I have a one ton Dodge Ram 3500 Van that I purcahsed used with LT load range D tires that I used for a year. I stepped up and bought qty 4 load range E, Silent Armor Goodyear... top of the line tires when I started pulling my TT. I run them at 60-65#. In two years I have now twice hit significant bumps on the interstate, both times towing and both times I could do nothing about it... one was a 4X4 straddling my lane... the other time was in a driving rain storm and I hit a big pothole on the side and lost my hubcap.

The tires took both in stride. I stopped within a few miles of hitting these significant obstacles and could find not even a scuff mark on the side walls of these tough tires.

The ride is a bit stiffer without a towing load, but not so bad that I would say I made a bad decision. They corner better and have great snow traction. Twice a year Goodyear gives $80 dollar rebates (double if you use their credit card) on a set of 4.

I think I paid about $1100 with rebate at a local owned Goodyear dealer. He discounted to nearly meet online price offered by Tirerack dot com but I get FREE every 6K miles balance and rotation for life of the tires... with about 25,000 on them in two years, they look brand new with no significant tread loss to my eye.
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Old 03-21-2015, 08:58 PM   #20
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When I stepped up to 245-70r17 load range E Michelin X M&S, from the factory Hankook tires, my "wiggle" went away. They are expensive, however, I value my life more! I do deflate some when not towing but as someone said, it is a truck.
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