FX4life07

iTrader: (1)

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

kobayashi maru

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

snowborderus

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

haha

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.

yelbike

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.

cosway

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.

YoungDiesel

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

cosway

Chalk method is best.

Mattloz

What's the chalk method?.

Fordfan2006

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.