What PSI
Fleet Mechanic
Joined: Oct 2002
Posts: 1,385
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From: Mercer County, OH
It's been my experience that higher tire pressure will give a bumpier ride, increase tire wear in the center of the tire, give less traction on wet roads and increase mpg.
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Fleet Mechanic
Joined: Aug 2002
Posts: 1,344
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From: Sioux Falls SD
Never set below the tag on the door... Remember all the idiots with Explorers. My 99 4x2 calls for 32 front and 35 rear. Also donot go above max psi on tire sidewall. My tires have a max psi of 35. I keep all four the same at 35 psi and the wear has been even.
Dan
Dan
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Posting Guru
Joined: May 2002
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From: Chicago Area
You should run the tires per the pressure listed on the door jamb. If for some reason you don't have it there, get an owner's manual, or go to Ford. It is not possible for anyone to properly make a recommendation without knowing all the details of your truck, it's tires, and the loads it handles.
For example, my F150 recommends only 26 psi in the front tires (factory "Sport" package, 275/60x17), which surprised me and everyone else who sees it. The rears are 32 psi.
We know it is dangerous to run low, but it also can be dangerous to run high: less tread contact and impact resistance.
For example, my F150 recommends only 26 psi in the front tires (factory "Sport" package, 275/60x17), which surprised me and everyone else who sees it. The rears are 32 psi.
We know it is dangerous to run low, but it also can be dangerous to run high: less tread contact and impact resistance.
Last edited by MrBSS; May 16, 2005 at 04:34 PM.
Senior User
Joined: Dec 2004
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Right now my tires are at about 30-32 PSI. I was going to filll em all up to about 40, but from what i hear its good to leave them as ford recommened? I have oversized tires, thats why I though they should be inflated more. Max cold inflation is 65 PSI, 32".
Posting Guru
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What type of tires are they? Are they P series, LT? If LT, what load range? Also are they original or replacements. If OE are P series and replacements are LT or visa versa, you do not want to go by the sticker. If OE are P series and replacements are LT, the sticker PSI will be too low. Too high if the reverse. The sticker PSI is only good if the tire on the vehicle is the size and type listed. If what is on ther are P series then 32 to 34 would probably be about right. If LT it would depend upon load range. Load range C would probably be about 36-38, maybe 40. I have not had any experience with load range D, but when I had LR E tires, I started at 50 and worked up as needed. This all assumes we are talking about an F150, not a heavier truck.
Senior User
Joined: Sep 2002
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From: Barrington USA
the PSI listed on the door jamb is only good for factory spec tires anything other type of tire would require a different PSI than that, just remember the rims are rated for 60 PSI so u can't go over that
Posting Guru
Joined: May 2002
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From: Chicago Area
While the LT tires, and especially C or higher rated tires, can stand higher pressures and consequently greater loads, I don't think that they require higher pressures. I do know that you cannot assume greater load capacity when using them because other components will then become the "weakest link". Consequently, IMHO, they should probably be inflated to about the same pressure as the standard tires (maybe a few PSI higher) and will then have about the standard load capacity.
I guess I'd recommend that anyone contemplating a significant change from the OEM tires should talk to the tire company.
I guess I'd recommend that anyone contemplating a significant change from the OEM tires should talk to the tire company.
Last edited by MrBSS; May 17, 2005 at 09:05 PM.
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Originally Posted by MrBSS
While the LT tires, and especially C or higher rated tires, can stand higher pressures and consequently greater loads, I don't think that they require higher pressures.