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What tire pressure do you run?

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Old 09-13-2017, 06:28 PM   #11
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I'm running 38-40 psi. in 275/70/18s BFGs
35psi. felt a little soft..... but I drove a SD F-250 13 yrs. prior.....
So the whole F-150 platform felt really soft and squishy to me already.
Thought I read on the forum that people were recommending 50psi in the BFGs because of the E rating.
I get that. I tried 50 PSI when I first bought the tires. I thought I was going to shake my insides out. Dropped that to 45, was a little better. I was so used to running 50 in my Ram, which rode great, that anything less felt like I was doing something wrong. Then I thought, well my F150 is A LOT lighter then my Ram was, so there's no need to run such a high PSI. Dropped it down to 40, which was a lot better than even 45. I noticed that I still wasn't having full contact with all of my tread, especially in the rear. So I dropped it to 35 almost 10k miles ago and that's where I'll run it until the tires can't go anymore.
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Old 09-13-2017, 06:34 PM   #12
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I tried 50psi. in mine... but same thing, real rough.
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Old 09-13-2017, 11:23 PM   #13
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Quote:
Originally Posted by Phil48315 View Post
I'm running 38-40 psi. in 275/70/18s BFGs
35psi. felt a little soft..... but I drove a SD F-250 13 yrs. prior.....
So the whole F-150 platform felt really soft and squishy to me already.
Thought I read on the forum that people were recommending 50psi in the BFGs because of the E rating, are your 17s D rated?
I ran 275/70/18 KO2s last year and ran them at 40psi and that was perfect. I ran them at 33psi for 2 months while testing something and it was very "squishy."
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Old 09-14-2017, 12:23 AM   #14
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48psi on Michelin LT275/70/18. E-rated tire. Rides great.
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Old 09-14-2017, 12:33 AM   #15
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Hi, my truck came with 18" LT tires. The door sticker says to run 40 lbs. on all four corners. My tires have a max cold inflation of 50 lbs. I run 50 lbs. in my rear tires when towing my travel trailer. 35,000 miles on original tires.

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Old 09-14-2017, 01:35 AM   #16
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The sticker on the door is irrelevant if you're not running the same type of tires the truck came with.
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Old 09-14-2017, 03:05 AM   #17
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285/75-17E, 40 psi.
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Old 09-14-2017, 07:55 AM   #18
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Is the chalk test accurate?

i can't decide what to put in my new tires. The original tires were 265/60R18 110T SL which the door jam says full to 43 psi cold. New tires are 275/55R20 117T XL.. Both have a max psi of 50. Since the new tire has sa slightly higher load rating but the same max PSI, I would think that I could run a Lower psi and still achieve the same load rating as the old tire
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Old 09-14-2017, 08:40 AM   #19
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You're probably right in your assumption regarding the new tires running at a little less pressure (unless you're loaded/towing of course). The chalk test is THE way to determine the best tire pressure.
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Old 09-14-2017, 08:57 AM   #20
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I run 40 in mine. It rides and handles great.
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