so im like brain dead, i guess iraq does that to ya. but im gettin 35s when i get back right. so whats the tire pressure supposed to be at? i mean u cant really go by what the door on the truck says, cuz its not the original size tire. so i mean what do you do? ahhhhhhhhhhhhhhhhhh

 

When I bought my '01 2500, included was a booklet from Michelin explaining tire inflation vs load. Depending on the load I could be anywhere from 50-80 lbs.
You'll find the same problem with a 4x4. Off-road inflation will be different than on-road. Inflation will also change with the on-board load. Hopefully folks with 35's will share their inflation trial and errors. Otherwise it will be trial and error testing between fuel mileage, tire wear and ride comfort. Everybody looks for something different.

 

Go with what's on the tire. Since larger tires are made for larger/heavier vehicles go with what the tire says.

 

Tire gives maximum inflation pressure....... Only time you really need that, is when you are hauling a heavy load, or possibly towing...... and it makes for a pretty stiff ride.

 

exactly, what i usually do is say max is 70, ill run like 60. but thats just because what i wanted to do, no real reason i guess. i dont ever have a load in the truck.just curious what yal did.

 

True, but also going with the max pressure will help against tire wear and will help compensate for environment(cold/hot/humid, etc.)

 

Running full pressure on an unloaded tire (aside from the truck itself..) will tend to wear the center of the tread faster than the edges. Of course, it also makes for the best fuel economy......

Everything is a compromise. Going to low will give you shady handling, poor fuel economy (not that it is that good to begin with...) and odd tire wear......

I suppose, if someone was feeling REALLY froggy, they could pick up on some temp tape, that changes colors with temp variations, slap some across the tread, drive for a bit, and alter pressures so you get a solid color all the way across. I, however, am just not that ****.

 

My pro comps are max at 60, I run them at 50.

 

My rule of thumb has always been for general use, 80% of maximum tire pressure on a radial tire.

Unless I'm towing the 7700# tractor or airing down for off-road, I run my 50# rated FCIIs at 40#...

 

When I got my 35" Toyo Open Country MT's, I emailed Toyo and asked them what it should be specifically for my truck since I too figured the door placard would no longer apply. Here is their response:

--- ToyoTech <Toyotech@ToyoTires.com> wrote:
> Pressure settings for front and rear calculates to
> the same as placard
> at 35 psi cold.
>
> -ToyoTech

I've been doing that for almost 3 years now, and they are wearing perfect. I chalk tested the fronts one time, and the wear was perfect. When I haul heavy loads, I up it to about 40 (if I recall correctly, the max PSI on the sidewall is 45).