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Old 10-23-2015, 03:28 PM   #11
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Here is what I have found out from doing research and a little information from Goodyear, OK, the Goodyear information was useless as well as their website, can't find any information on this tire and the load/inflation table. When the girl from Goodyear wrote me back she quoted values for a tire with a 114 load rating and these are 116. So basically useless.

From reading the great information from the Bridgestone and Toyo tire websites, they both have the same information, I found out that when you run a passenger tire on a light truck class of vehicle (which includes pickups, vans and minivans, and SUVs) it is the federal law that you have to reduce the load carrying capabilities of the tire by 1.1, in other words divide the max weight by 1.1. So my tires are rated at 2756lbs which means on a light truck their max is actually 2505lbs, nice to know.

I also found out that passenger tires reach a max weight at a pressure lower than max allowed pressure and by increasing the pressure you do not increase the weight capability of the tire. You only increase the speed capability and change the handling characteristics. These tires are rated at a max weight of 2756lbs (2505lbs if on a light truck) at 36PSI which means from 36PSI to their max pressure of 51PSI it is still 2756lbs (2505lbs). So by running a higher pressure you are not increasing the tires ability to handle more weight, you are only changing its handling characteristics. So in this case if you want a stiffer sidewall while towing to reduce flex and sway induced by the sidewall, run a higher pressure. If you don't like the trade off of a harsher ride, it is not necessary.

I wonder why Ford does not put this type of information in the owner's manual under the towing or tire section? It would be really nice to know.

So now we are all educated a little more when it comes to running passenger tires on a light truck (or at least I am) and using it for towing. Of course if you are running LT tires none of this applies because it is a completely different set of rules and load charts.

Oh, by the way, your ST trailer tires should always be ran at the max pressure no matter how much weight you have on them. This was the information I found on numerous different trailer tire sites that make trailer tires. As a matter of fact most of them void the warranty if you were not running at max pressure.
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Old 10-23-2015, 07:20 PM   #12
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For those who remember what happened when Ford thought they knew more about tires and pressure than the tire manufacturers with the Explorer. Unfortunately we lost inocent people due to those idiots. When I towed with my F150, I ran the tires at rated pressure on the sidewall and fronts at 35. Even on my current SRW F250, I run 70psi in the rear 65 in the front. Tires rated at 80 psi max but my Truck tows perfectly with 1,100 lbs of torque weight and bed packed at those pressures. Good luck and be safe!
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Old 10-28-2015, 01:20 AM   #13
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When towing I run my LTX MS2's on my F150 at 41 psi all the way around. 5 or 6 psi does not sound like a lot, but remember that it is about 17% of the recommended 35psi. I find that it does stiffen up the ride a little which is preferable for towing. I wish our TPMS measured temperature so I could see if there is any appreciable temp difference at different inflations.
How do you like these tires? Looking at the new Michelin Defender LTX MS tires for our 2004 Expedition. Load rating 113 which Expy is rated for. They are pricey at $204 each from Costco.

Currently have 285 50 R20's that previous owner put on. Stock was 265 70 17.

Trying to figure out if P rated is sufficient with a RAWR of 4128 or if we should get LT's.
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Old 10-28-2015, 06:48 AM   #14
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How do you like these tires? Looking at the new Michelin Defender LTX MS tires for our 2004 Expedition. Load rating 113 which Expy is rated for. They are pricey at $204 each from Costco.

Currently have 285 50 R20's that previous owner put on. Stock was 265 70 17.

Trying to figure out if P rated is sufficient with a RAWR of 4128 or if we should get LT's.
We have only put 3000 miles on the truck so far but the tires seem fine for what I have driven, no snow or heavy rain. The ride is good at the recommended 35PSI but is extremely rough at the max 51PSI, as would be expected. I really don't have anything to compare it to because I have never had any other tire on it.

I did have a truck in the early 90's that came with LT tires that made the ride very rough. When I replaced them I went with passenger tires and there was a great improvement, did not regret the decision. But the truck was not used for towing, just daily driving, so the change to passenger tires was a good idea.
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Old 10-30-2015, 03:37 PM   #15
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Not sure about the Defender, but when I bough, the Michelin LTX MS2's were Costco's bestselling tire (in Canada and the US) and they had the weight ratings I was looking for. I run them all year round and they are vey quiet and have very good traction in the snow. They probably would not fare that well off road because the tread is not aggressive enough which is what gives it the quietness on the highway. They are definitely a huge improvement over the Wranglers that came with the truck and mileage rating on them was about 10,000 miles more than most comparable tires which is something to factor in. I air them up 5 to 6 pounds for towing which makes the ride a little harsher but makes the tow more stable. The Michelins are also praised on Tire Rack etc. As mentioned above, one of the only complaints is the price, but they are definitely worth the $10 per tire more than the Goodyear replacements were.
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Old 10-30-2015, 04:31 PM   #16
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Not sure about the Defender, but when I bough, the Michelin LTX MS2's were Costco's bestselling tire (in Canada and the US) and they had the weight ratings I was looking for. I run them all year round and they are vey quiet and have very good traction in the snow. They probably would not fare that well off road because the tread is not aggressive enough which is what gives it the quietness on the highway. They are definitely a huge improvement over the Wranglers that came with the truck and mileage rating on them was about 10,000 miles more than most comparable tires which is something to factor in. I air them up 5 to 6 pounds for towing which makes the ride a little harsher but makes the tow more stable. The Michelins are also praised on Tire Rack etc. As mentioned above, one of the only complaints is the price, but they are definitely worth the $10 per tire more than the Goodyear replacements were.
I am a big fan of Cooper Tires. I have never ran the truck tires but have ran them on my passenger cars for years and I love them. I am also upgrading my 65 GTO to 17" tires and I am considering Cooper for it as well. When my Goodyear's on the truck wear out I might try the Cooper truck tires and see how they do.
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Old 10-30-2015, 04:46 PM   #17
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I am a big fan of Cooper Tires. I have never ran the truck tires but have ran them on my passenger cars for years and I love them. I am also upgrading my 65 GTO to 17" tires and I am considering Cooper for it as well. When my Goodyear's on the truck wear out I might try the Cooper truck tires and see how they do.
We ended up going with a set of Cooper Discoverer's LSX Plus 275/55/R20 XL 117T for our Expedition.

Too early to tell how good they are but definitely a little louder than our Hankooks were.
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Old 10-30-2015, 06:18 PM   #18
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We ended up going with a set of Cooper Discoverer's LSX Plus 275/55/R20 XL 117T for our Expedition.

Too early to tell how good they are but definitely a little louder than our Hankooks were.
Don't like loud, that is not good. If you don't mind update me after you have put some miles on them and let me know what you think.
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Old 10-30-2015, 06:25 PM   #19
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Don't like loud, that is not good. If you don't mind update me after you have put some miles on them and let me know what you think.
I should clarify that I had summer only and 111 load rating tires before so not exactly apples to apples. Not sure how much difference one should expect moving to XL all season tires. It's really not too bad. Kids didn't notice. I knew going in that their noise ratings weren't as good as Michelin's from consumer Reports.
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Old 10-30-2015, 07:52 PM   #20
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I should clarify that I had summer only and 111 load rating tires before so not exactly apples to apples. Not sure how much difference one should expect moving to XL all season tires. It's really not too bad. Kids didn't notice. I knew going in that their noise ratings weren't as good as Michelin's from consumer Reports.
Yeah, that would be hard to compare since they are so different.
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