Iv got general grabber at2 load range E in size 275/70/18 I'm currently running 50 psi just tring to figure out what psi I should run them for daily driving ? Thanks

 

I'm pretty sure you'll get the standard replies on this one so let's see if I can sum up in one post.

1. Start with PSI stated on driver door placard (Ford's recommended pressure)
2. Increase/decrease pressure in 5 psi increments depending on your preference, load and environmental conditions
3. Perform chalk test to determine over/under inflation
4. Don't exceed max PSI stated on tire sidewall

 

40psi is what I'd recommend for everyday use.

 

When I ran E rated tires I always ran them around 50 psi. That was my happy medium.
Never decreased air but increased when needed.

 

I had a Tahoe with duratrac e rated tires which wore out prematurely from running what a good year vendor told me should be 35 psi as the door sticker stated. Than I tried running stupid high unloaded which was crap for ride quality. I finally settled at 50-60. My wife's expy now has duratracs too, which I run at 50-60 as well, no issues.

 

My max tire psi is 80 but I was told max on the Ford wheels is 50. Door says 40 so I run 40 day to day and 50 when towing or have 1500LBS in bed.

 

Not really a hard ting to figure out. Just stay in the area of you rim and tire specs. Some people average it.

 

Chalk method is best.

 

What's the chalk method?.

 

put a line of chalk on the tread and drive it and see what part wears off. Sides pressures too low center pressure is too high.