I know this was posted on here somewhere, just having trouble finding it. I just put on Nitto Terra Grapplers 295/70r18. What pressure are you running? Currently I have them at 65psi like the door says. Not too bad but a little squishy after driving on them awhile. (Unloaded) Any suggestions?

As side note tire fit good with no lift, mild hum at highway speeds and speedo is dead on at 65mph. Was reading about 3mph fast before.

 

I noticed the "squishy" or "squirmy" feel for the first few days. I was coming from BFG AT's so maybe it was just adjusting or maybe they broke in somewhat, but I was coming home Friday and tried swerving back and forth just to see how it felt and it wasn't bad at all. I've got almost 5,000 mile on the right now.

I run about 73 in the front and about 68-70 in the rear, but I've got the "Low Tire Pressure" warning message. I would rather deal with that than put up with the rough ride at higher psi's.

 

Why are you getting the light? Too high of pressure? The door says 65 for the stock tires, not sure where the low pressure light comes on at.

 

Mine says 65 psi front and 80 psi rear. I think you get about 10% below that before the low pressure alarm goes off. I do have the F350, but I thought it was the same for all F250's as well.

 

F250 is 65 all around I believe. I have 65 in all 4 and I have no light. I will try bumping the pressure up a bit and see how it is.

When load the truck up do you increase the pressure?


Thanks.

 

Yes I do in the rear. Only when it gets big like my 5th wheel, it weighs 10,500 but only about 2,300 lbs, I think, winds up over the rear axles.

They do great towing, I think better than the BFG's and I ran them for 20 years on every truck I owned.

 

I run 80 in mine all four corners.......I'll put up with a bit harsher ride rather then the feeling of driving on bags full of jello!

 

The TPMS goes off if you are below 62 psi. At the pressures you are running, you should not be seeing the Low pressure warning.

I would inflate all tires to 80 psi. Run around he block a couple of times to reset the TPMS and then lower the pressure to 68-70 that you want to use. By fully inflating the tires you will reset the TPMS and as long as you don't dip below 62 psi, you should not see the the warning message.

 

Ran them all up to 68 and seems better. Will try them tomorrow on the highway. When I checked them they all were 60 to 62, I told them to put them at 65 when they installed them, oh well.

 

2011 F-250 with XLT 18 inch wheels is 65 front and 80 rear for the factory ContiTracs (door sticker).
80 when empty is too much.
I don't follow the door with my 295/70/R18 Nitto Terras.
Following that, the steering control is uncomfortable (squirmy).

Normally I run 75 up front and 72 at the back when empty.
Anything less than 68 at the back and my truck vibrates.
Towing my 20 foot flatbed, the rears get 80 cold.

For the past two weeks, I've actually been running 78 front and 75 rear.
I like that level of PSI but that may be a bit too high for empty.
The edges of the rear tires aren't touching by about half a CM (proven by driving over dust on concrete covering the wheels).
So I need to return to normal before they wear incorrectly but haven't had the time to mess with it.

Find a tire pressure you like and print your front/rear PSI on two labels and cover that door sticker.
This way if a tire shop works on it, they don't return it to 65/80.

 

Thanks, I will give that a try.

 

I have to say that no they don't. The 80 psi tire warning goes off on mine at about 68, but sometimes just below 70. I read it in the manual that it was around 10% or 15% of stated value and the TPMS goes off. I've done it many times, with 3 sets of tires already, I know its true. I try to get them as low as I can.

To the OP you have to air them up and/or check when the tire is cold, you may know I'm just checking. Also, the truck sitting in the sun for several hours will heat the air enough that you get erroneous readings. It matters if you are trying to adjust 1-2 lbs at a time, just sayin.

Yes, I also know you're supposed to air them up to get the TPMS sensor to re-set. I have found that it will re-set by only going to 75 psi too.

But alas, after this weekend I won't have to deal with Ford's crappy system of "protecting the idiots" TPMS.

 

I just checked my door panel and it says 65psi for front and back. I have a 2011 F-250, 18" wheels and it had the factory Continentals 275's. The light was already off when I picked up the truck, so it must have reset immediately. I tried 75 front and 74 rear but I get a rough ride, like a washboard. Will retry them tomorrow morning at 72 and 70. The light must be based on the percentage from the 65psi.

Thanks for the input guys.

 

The light is based on a percentage of the tires max rating, Which on our trucks is 80 psi. So any air pressure below 62 psi sets it off. I leave my tires at 65 psi unless I'm towing, Then I bump them up to 80 psi, Since I get close to max loads with my gooseneck.

When I pick up a nail or other slow leak and the TPMS goes off. If I don't have time to get the leak immediately fixed. I just inflate the tire to 80 psi and the light will go off ( after a mile or two) and stay off until the presure again drops below 62.