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Switched from P tires to LT tires, what pressure should I run them at?

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Hey everyone, I have a 2009 Ford Ranger FX4 and I just dropped a ton of money on some new LT265/75/R16 BF Goodrich All Terrain KO tires. The tires that came on the truck were the size P255/70/R16. What kind of pressure should I be running the LT tires at? The placard on the door shows to fill them to 30psi. Just thought I'd get some input before I mount and balance them today. Thanks everyone. I will post pictures when they are mounted!
 


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What's the load range? I bought E rated BFG Rugged Terrains because of the thicker sidewall. I run them at 40 PSI (max 80 PSI with this load range tire) and have gotten even wear after the first 7000 or so miles. If it's the same load range as the OE tires, I'd stick with the pressure listed on the sticker. Regardless, pay attention to how they wear constantly and take periodic measurements. Adjust the pressure if they aren't wearing evenly (more pressure for higher outside wear; less for higher inside wear) and keep them rotated regularly and you'll be fine.
 

shane96ranger

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It should say right in the tire. Whatever the tire says trumps the door sticker.

EDIT: Just run around 5 psi under the max is what I was told by a guy I know over at Big O.

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It should say right in the tire. Whatever the tire says trumps the door sticker.
No, that is the max the tire can be filled to. The sticker is what Ford says it should be filled to for optimum tire wear, control, fuel economy and ride... of course non standard tires blow that out of the park.

It is going to be different depending on what the tire ends up on, a F-350 with a gooseneck needs more pressure than a little Ranger that runs around mostly empty.

You are going to have to experiment and see what wears and rides the best if nobody else pipes up... and even then it may vary from brand/model to brand/model of your tires.

I just checked the load range E tires on our service truck, max is 80psi... my Ranger would spend more time in the air than on the ground with 75 psi in the tires.
 
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shane96ranger

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No, that is the max the tire can be filled to. The sticker is what Ford says it should be filled to for optimum tire wear, control, fuel economy and ride... of course non standard tires blow that out of the park.

It is going to be different depending on what the tire ends up on, a F-350 with a gooseneck needs more pressure than a little Ranger that runs around mostly empty.

You are going to have to experiment and see what wears and rides the best if nobody else pipes up... and even then it may vary from brand/model to brand/model of your tires.

I just checked the load range E tires on our service truck, max is 80psi... my Ranger would spend more time in the air than on the ground with 75 psi in the tires.
EDIT: What the hell tires are you running that are max 80 psi? My F150 has a max load of 50 psi, and they are some heavy duty tires. Maybe Dude's recommendation was based off my truck and the tire. He came out and looked at the max and said to go 5 under. Didn't even look at the door sticker.
 
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That I know of, the best way to get an accurate reading for tire wear/pressure, would be to do the chalk testing.
 

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Air the tire up to spec, draw a chalk line across the thread and roll the truck. If its all worn off, your good... If the outsides aren't touching, lower air pressure accordingly. Tire/rim width combos make this the tricky bit. I was running 22F/18R psi to get my 14.50 wide tires on 10's to sit flat.
 

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EDIT: What the hell tires are you running that are max 80 psi? My F150 has a max load of 50 psi, and they are some heavy duty tires. Maybe Dude's recommendation was based off my truck and the tire. He came out and looked at the max and said to go 5 under. Didn't even look at the door sticker.
Peerless Widetrack Baja AT's, 235/85-16, load range E on a SRW F-350. The high PSI is super common for heavy pickup tires, the other two trucks are out but I bet they are similar. I know people run that size and even rated tire on Rangers.

45psi isn't bad for a half ton (that is what I run with my oversized tires on my '150), I just don't think your 5psi rule is safe across the board by any means.
 
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I ran LT265/75r16's in a load range E (80psi max) on my 05 sport trac, ran them at 35psi all the way around and they wore great.
 

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