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Unread 04-24-2013, 08:31 PM   #1
sbrody2448
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Uneven Tire Wear - Why? e

I have '99 Grand Cherokee, 8 cylinder with 160K. I have gone through tires so fast due to uneven wear and cannot figure out why. I have had the Jeep aligned 3-4 times at least. I just had it in to Firestone and they could not find any reason for the uneven wear. Tires have been balanced. Thought it was U joint and told that is fine. Had tire rods fixed a while back. The tires I have are a bit wider than stock and I was told that is the reason why the outer edge is wearing faster than the other areas of the tire. I was also told to rotate tires every 4K miles, which seems too often and not the real cause of this. I have had it to various shops and not one can tell me why the tires are wearing unevenly. I am on my 3rd set of tires here and the last one's went on me by 23K. Any ideas?

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Unread 04-24-2013, 08:48 PM   #2
dillonjm
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Quote:
Originally Posted by sbrody2448 View Post
I have '99 Grand Cherokee, 8 cylinder with 160K. I have gone through tires so fast due to uneven wear and cannot figure out why. I have had the Jeep aligned 3-4 times at least. I just had it in to Firestone and they could not find any reason for the uneven wear. Tires have been balanced. Thought it was U joint and told that is fine. Had tire rods fixed a while back. The tires I have are a bit wider than stock and I was told that is the reason why the outer edge is wearing faster than the other areas of the tire. I was also told to rotate tires every 4K miles, which seems too often and not the real cause of this. I have had it to various shops and not one can tell me why the tires are wearing unevenly. I am on my 3rd set of tires here and the last one's went on me by 23K. Any ideas?
2 or 4 wheels drive?

How are the ball joints?

The fact they thought a u-joint would cause uneven wear in this fashion makes me question their knowledge of steering components.
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Unread 04-24-2013, 09:33 PM   #3
doorjamm
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A u joint? On the driveline or axle?I thought all wj axle shafts were cv unless you spent 800 on chromoly IRO swaps.
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Unread 04-24-2013, 09:45 PM   #4
LJman06
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I agree with dillonjm...check balljoints...hell even check hub bearings. typically outside tire wear on cases I've seen is improper alignment, usually toe. judging by the Ujoint comment, this wouldn't seem too far fetched.
you can check toe real easy with a buddy. essentially measuring track width. go by the seem on each tire with a tape measure as high as you can on the back (control arms will limit you) and equally as high on the front. Difference should be about 1/8" with the front measurement being less.
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Unread 04-24-2013, 10:42 PM   #5
CrazyWalnut13
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I agree with what the others have said, and also 4-5k miles is about right for a rotation. And as long as the tires aren't directional, you could have them dismount/flip/remount the front tires during the rotate so that the next time you rotate, the more worn parts will be on the inside.
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Unread 04-24-2013, 10:55 PM   #6
tjkj2002
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Quote:
Originally Posted by sbrody2448 View Post
I have '99 Grand Cherokee, 8 cylinder with 160K. I have gone through tires so fast due to uneven wear and cannot figure out why. I have had the Jeep aligned 3-4 times at least. I just had it in to Firestone and they could not find any reason for the uneven wear. Tires have been balanced. Thought it was U joint and told that is fine. Had tire rods fixed a while back. The tires I have are a bit wider than stock and I was told that is the reason why the outer edge is wearing faster than the other areas of the tire. I was also told to rotate tires every 4K miles, which seems too often and not the real cause of this. I have had it to various shops and not one can tell me why the tires are wearing unevenly. I am on my 3rd set of tires here and the last one's went on me by 23K. Any ideas?
What tires are mounted? Some tires just wear funny no matter what and if your using the wrong tires that can be a issue also as well as the width.


Oh and yes rotate at least every 4-5k.If real aggressive tread rotate much sooner,say 2k-3k.
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Unread 04-25-2013, 06:56 AM   #7
zbban1
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This might sound stupid, but do you use it to deliver a newspaper route? That'll wear out the outsides of front tires super fast (speaking from experience).
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Unread 04-25-2013, 08:30 AM   #8
imaguy3
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slow down on cornering too, these aren't race cars.
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Unread 04-25-2013, 07:47 PM   #9
sbrody2448
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Its a 4 wheel drive. I was told the ball joints were fine as were the U joints. There are no upgrades on the suspension. I drive this pretty much like an old lady and do not deliver newspapers. (?). I will check the toe on this as I have had it aligned several times. Hub bearings? Had not heard about that. This is frustrating.
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Unread 04-25-2013, 09:11 PM   #10
LJman06
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if the hub bearing is bad the whole tire will "wobble" around....may or not be cause of what you describe but worth checking. check tie-rod ends for play as well.
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