tire PSI
Senior User
Joined: Jan 2004
Posts: 130
Likes: 0
From: Pennsylvania
I guess it depends on if you are using the original size tire or an over size one.On my 87ranger I use 31x10.5x15. The tire manufacturer says 50psi on the tire but on the door ford says use 35psi. I go to 42psi & get good tire ware. I guess you just have to try different psi until you get it right.
Good Luck!!
Matt
Good Luck!!
Matt
Junior User
Joined: Oct 2004
Posts: 76
Likes: 0
From: Mobile, AL
Just yesterday, had my 2000 XLT S/C in a local dealership taking advantage of a $9.95 oil/filter change. Stock tires had 32# each, but during the checkup, later found out they inflated to 35#. Coasts better, but ride is harder. Probably will increase gas mileage some.
Thread Starter
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Senior User
Joined: Nov 2004
Posts: 357
Likes: 0
From: Lancaster, PA
the reason I'm so unsure is because when I got my truck a year ago the middle of the back tires were worn pretty good and i was wondering if they used 35 and it overinflated them and caused the middle to wear. I just got new tires and I don't want to ruin them.
Elder User
Joined: Sep 2004
Posts: 538
Likes: 2
From: Florida
Variations in tire brands, styles and load ratings will call for different air pressures. For tires with 35psi max I usually run them at 32-35 (more in the fronts since that is where the most weight is).
My current tires on my '02 are 44psi max. The dealer had them at 30 and they were half flat and mushy handling. I bumped them to 40 and they handled better but were noisier at highway speeds. I've dropped them back down to 36.
When I get new tires I'll probably start off about 5psi below max (as printed on the tire) and adjust from there. In any case, I will never run my tires below 30 psi no matter what some sticker says. Running below 30 psi will cause excessive heat, drag and wear on most any automotive or truck tire (in my not-so-humble opinion).
My current tires on my '02 are 44psi max. The dealer had them at 30 and they were half flat and mushy handling. I bumped them to 40 and they handled better but were noisier at highway speeds. I've dropped them back down to 36.
When I get new tires I'll probably start off about 5psi below max (as printed on the tire) and adjust from there. In any case, I will never run my tires below 30 psi no matter what some sticker says. Running below 30 psi will cause excessive heat, drag and wear on most any automotive or truck tire (in my not-so-humble opinion).
