I just got rid of the Continentals and slapped some 305/65/18 BFG All Terrains on my stock wheels on my 2006 F250 4x4. They are E rated tires with a max PSI of 65 pounds. Discount Tire aired them up to full capacity when they installed but I have been lowering the pressure over the past few days because I noticed that the edges of rear tire is not making contact with the pavement due to overinflation.

Right now Im at 50psi in rear and 60psi in front, but still not getting full cantact patch on rear outer edges. Im about to lower even more and go to 45 rear and 55 front while unloaded. Just curious what others are running with thier tire pressure. I paid a lot of money for these tires and want to get the most life possible out of them. Thanks in advance for any suggestions.

 

What does the door sticker, owners manual, glovebox, whatever recommend for the truck? I run 30lbs on my early Bronco, but your weight is a lot higher than mine.

 

Assuming alignment and balance is all good...

Take a temperature scanner, and measure the tires temperature at the inside, outside and center of the tread after a run of about 30 min (for your normal drive).

Tire pressure should be set so the temperature is close to identical at all 3 locations.

This procedure will get you slightly different pressures on each tire, depending on the load of the tire at that particular location.

It will vary according to load and speed.

So the pressure right for 40mph around town is different from the 80mph highway speed pressure.


But the method is tried and true.


BTW, start with the factory recommended pressures in all 4 and then adjust it...

 

For a long time i was running about 35 psi on my 05 F250 Powerstroke. Wear was even (Toyo M/S from Les Schwab), but mpg's were suffering slightly.

 

The door sticker usually lists the tire pressure needed at, or near the rated load, which can be quite a bit more than what's needed for an unloaded truck.

For the OP, google "chalk method".

 

Say what? A 2005 F250 Superduty is 65 front and 80-85 rear.

Josh

 

Did you read what I wrote in the post just above?

 

Yeah, and good luck to you during an insurance investigation when they find you are running 30 psi in a tires that should be at 90 psi.

You should be running what the door sticker says, it is afterall the WARRANTY/ INSURANCE Placard after all.

Josh

 

I cal FUD on this for several reasons. The most important is that a tire that is overinflated for the load it's carrying will have a significantly reduced traction on a wet road.