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Old 10-06-2011, 08:43 AM   #11
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P.S. Going from P to LT in the same size tire shouldn't be an issue. LT load range C (50 psi) is probably plenty though. Ford F150 LT factory tires are Range C. Many tire dealers do not recommend Range E (80 psi) for 1/2 ton trucks. A major tire dealer here in MN refused to put Range E on my 1/2 ton truck. I know that some people swear that is the way to go though.

People in farm country put LR E tires on for the 10 ply rating when out in the fields to prevent flats on 1/2 tons not for the load carrying. I ran them on our 04 Ram 1500 at 40psi and they were fine as many farmers do. As to the OP's question, I would check with his Ford dealer as to what was the stock size LT tire option for his truck and put that size on. Also on tireracks site as was mentioned it will show what was the oem LT tire size.

245/75-17
Load Range E was oem tire size for the heavy duty F150 according to tire rack.
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Old 10-06-2011, 04:59 PM   #12
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People in farm country put LR E tires on for the 10 ply rating when out in the fields to prevent flats on 1/2 tons not for the load carrying. I ran them on our 04 Ram 1500 at 40psi and they were fine as many farmers do.
Yes, more resistant to sidewall issues. The tire dealer here refused to put an 80 psi tire on my factory wheels. Running less PSI probably OK but then you wouldn't get the full capacity of the tire. The current 2012 ordering guide for F150 shows an LT option but it is Load Range C; 50 psi. I have the dealer document. You could put on a LR E and run 50psi I would think. Well, these discussions are endless as we all know . . .
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Old 10-06-2011, 05:21 PM   #13
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There are MANY threads here about tires.

Just make sure if you "up" the load range that your rims can take the increased pressure. Somewhere on the rim (not the tire) the max PSI of the rim is stamped in the metal.
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Old 10-07-2011, 01:50 PM   #14
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There are MANY threads here about tires.

Just make sure if you "up" the load range that your rims can take the increased pressure. Somewhere on the rim (not the tire) the max PSI of the rim is stamped in the metal.
Yep, that's why the tire dealer wouldn't put LR E's on my F150.
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Old 10-07-2011, 02:39 PM   #15
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Unless you want a bigger tire for looks, stick with the stock size. Even a slightly larger diameter tire can have a noticible effect on towing.

I went from a C load tire to an E load tire on my Titan for the stiffer sidewall. Towing is much more stable. I do not know the pressure my wheels are rated for. I will look into that tonight. I run 44 psi when the truck is empty and 55 when the truck is loaded or towing.
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Old 10-07-2011, 09:51 PM   #16
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Quote:
Originally Posted by smithmdsmith
Unless you want a bigger tire for looks, stick with the stock size. Even a slightly larger diameter tire can have a noticible effect on towing.

I went from a C load tire to an E load tire on my Titan for the stiffer sidewall. Towing is much more stable. I do not know the pressure my wheels are rated for. I will look into that tonight. I run 44 psi when the truck is empty and 55 when the truck is loaded or towing.
I will be getting new tires next spring (upgrade from hP tires). How do you mean towimg is much more stable? What improvment do you feel?
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Old 10-08-2011, 10:37 AM   #17
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Originally Posted by herk7769 View Post
There are MANY threads here about tires.

Just make sure if you "up" the load range that your rims can take the increased pressure. Somewhere on the rim (not the tire) the max PSI of the rim is stamped in the metal.
And it hasn't been mentioned, if the vehicles/wheels have TPMS (Tire Pressure Monitoring Systems) installed.......which are set for a specific tire p.s.i.

And on another note, excluding some TPMS systems, tires that run over 60-65 psi, need what is called a high pressure valve stem installed to safely run the 80 psi of a Load range E tire.

A lot of people don't know, that the regular ole, black rubber valve stem that everyone is used to seeing in their vehicle or camper wheels.....is rated for 60-65 psi max.

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Old 10-08-2011, 11:48 AM   #18
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About stems, if you do used a TPMS that involves a replacement cap on the stem, DO NOT use a rubber stem even if it is rated for 100PSI.

Centrifugal force will bend the stem over until the TPMS monitor contacts the rim. This will eventually cause a stem leak. Get the stiffer all metal or metal shank ones. They are worth the special order at most tire places.
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Old 10-08-2011, 09:35 PM   #19
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Wow! So much to think about just for changing tires. Glad I joined this site, you guys and gals are most helpful.
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Old 10-10-2011, 09:46 PM   #20
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Originally Posted by boubou

I will be getting new tires next spring (upgrade from hP tires). How do you mean towimg is much more stable? What improvment do you feel?
With the original tires, the truck would feel like it was squirming when I would hit uneven pavement or other less than perfect driving situations. With the heavier duty tires, the truck feels much more sure-footed.
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