cutting tires
Thread Starter
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Laughing Gas
Joined: Jul 2003
Posts: 893
Likes: 8
From: Lincoln, Nebraska
cutting tires
I have put 7000 miles on my pickup since i had it aligned and the tires are cutting bad on the insides. I have a 92 f-150 with factory rims with 33" tires and a 4" suspension lift. Could the alignment be off or is this something that i should expect to happen with the tall tires? i have heard different people say that it is normal and some say that it is off. i should add that it does once in a while pull to the right of left. What do you recommend i should run for air pressure?
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
The proper air pressure depends on how much weight are on the tires. Many people just pump the tires up to the max PSI listed on the sidewall, but that is not correct. That max PSI rating on the sidewall is the maximum air pressure to put into the tire, and should only be at that pressure when the tire is being used at it's max capacity. The max capacity of the tires is usually way more than what is actually being put on them, so if the pressure is too high, it'll wear out the center of the tires quicker than the outside edges. If the outside edges wear sooner, it's under-inflated.
A trick is to get some chalk and mark the tire tread about an 1-2" wide all the way across....then drive the truck so the tire rotates a couple times...and check the chalk line. If its rubbed off in the center more than the outsides, you're over-inflated. If the opposite, your under-inflated. You want that chalk to rub off evenly. Do it on a level surface.
A trick is to get some chalk and mark the tire tread about an 1-2" wide all the way across....then drive the truck so the tire rotates a couple times...and check the chalk line. If its rubbed off in the center more than the outsides, you're over-inflated. If the opposite, your under-inflated. You want that chalk to rub off evenly. Do it on a level surface.
Thread Starter
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Laughing Gas
Joined: Jul 2003
Posts: 893
Likes: 8
From: Lincoln, Nebraska
i checked my tire pressure and they are all at 25 psi the same as when it came out from getting tires put on it. does that sound right? or is there anything else i can do to see if it is aligned right?
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
The only way to check the alignment is put the truck on an alignment rack.
What I do is get a lifetime alignment at Firestone. For $160 or so, they'll align my truck as many times as I want.
What I do is get a lifetime alignment at Firestone. For $160 or so, they'll align my truck as many times as I want.
...specially on lifted fords.. (dont stay aligned??)
