max inflation for BFG 35x12.50r17

[eyesonly]

I've been searching all over, but I can't find this one little piece of information: What's the proper inflation psi for a BFG A/T 35x12.50r17? The most I can find is a max inflation of 50psi at 3000lbs.

Does that mean I should keep them at 50psi? I'm asking because I get low mpg and was reading that keeping tires at proper pressure is helpful.

[Diesel Freak]

First take a look at your tire ply rating. Should be "D" or "E" for these heavy rigs.
Then take a look at your door post. There is a suggested tire pressure rating there.
Hope this helps

[2001Thunder]

should be on the sidewall of the tire, what the max psi should be.

Its on the side wall. These trucks come from the factory with an E rated tire. It is best to keep it that way. Alot of people go to a D because they are cheaper. These trucks are designed to have a hard tire. Especially true on the '05 and up with the coil sprung front end. If the tires are down graded to a D rated tire and psi lowered to below 65psi the front end can vibrate like crazy over bumps. Just some good info.

[R.Taylor]

If you don't have the stock size,make, and model tires on the truck the door sticker isn't going to be accurate.

The proper way to check for proper inflation uses chalk and a lot of effort. Make a nice chalk line across the tread of the tire then drive around. Get out and check the line for even wear. Adjust pressure and retest as necessary.

For best MPG inflate to max PSI. Makes the ride rough though.

Jon, Not that I don't believe you but I can't grasp that a softer more compliant tire would cause vibration. Unless badly balanced the softer sidewalls should work like shocks and absorb bumps.

As a matter of fact there is a Service Msg out about this and i've fixed several by inflating the tires to 75 to 80 psi as directed by an E range tire. They can shake so bad you can lose control. I had one get away from me like that once on a test drive.

[eyesonly]

First take a look at your tire ply rating. Should be "D" or "E" for these heavy rigs.
Then take a look at your door post. There is a suggested tire pressure rating there.
Hope this helps

Hmm if the original tires are rated E, the information on the door post won't be correct, will it?

(edit: I see R. Taylor confirmed this, thanks)

Originally Posted by Jon

Its on the side wall. These trucks come from the factory with an E rated tire. It is best to keep it that way. Alot of people go to a D because they are cheaper. These trucks are designed to have a hard tire. Especially true on the '05 and up with the coil sprung front end. If the tires are down graded to a D rated tire and psi lowered to below 65psi the front end can vibrate like crazy over bumps. Just some good info.

I bought it used from a private party, the owner had lifted it and it has D rated BFGs on it. There is no recommended inflation psi on the side tire, as far as I can tell (I've looked HARD). Just a mention that there's a max load of 3000lbs at 50psi.

Here's a link to the exact tire: BFGoodrich Tires | Mud-Terrain™ T/A® KM2 | Tire Sizes & Specs

So are you saying I should inflate these to 65psi?

[R.Taylor]

Huh, learn something new everyday. I have D's on my truck @~35psi, But I have leaves. It's hard to find 35's with load E.

[R.Taylor]

If you don't have a vibration problem I wouldn't take them higher then the stated 50psi

Best MPG will be at 50psi, But it will ride hard and wear the tires faster/unevenly.

[eyesonly]

Originally Posted by R.Taylor

Huh, learn something new everyday. I have D's on my truck @~35psi, But I have leaves. It's hard to find 35's with load E.

I have an '04 F250 with leaves, though I have removed the overload leaf to reduce the rear end bouncing.

On a side note: I had my Ds at 35psi as well, running Edge w/Attitude also on level 3, boost level 5. What mpg do you get, and where do you find the Edge should be set for best mpg?