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correct tire PSI

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Old 12-16-2014, 04:08 PM   #1
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Default correct tire PSI

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
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Old 12-16-2014, 04:27 PM   #2
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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
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Old 12-16-2014, 05:15 PM   #3
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40psi is what I'd recommend for everyday use.
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Old 12-16-2014, 10:42 PM   #4
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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.
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Old 12-17-2014, 12:33 AM   #5
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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.
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Old 12-17-2014, 10:40 AM   #6
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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.
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Old 12-17-2014, 10:56 AM   #7
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Not really a hard ting to figure out. Just stay in the area of you rim and tire specs. Some people average it.
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Old 12-17-2014, 10:59 AM   #8
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Chalk method is best.
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Old 12-17-2014, 11:39 AM   #9
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Quote:
Originally Posted by cosway View Post
Chalk method is best.
What's the chalk method?.
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Old 12-17-2014, 11:55 AM   #10
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Quote:
Originally Posted by Mattloz View Post
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.
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