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Old 11-18-2012, 07:37 AM   #1 (permalink)
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Weird tire wear. Only the middle worn out.

Two of my friends and I have been getting weird tire wear in the rear. Only the middle of the tire is bald with quite a bit left on both corners.

I run around -2.5 deg camber, toe settings I don't have a number, but it's slightly toe in. Tire pressure around 25psi.
Street driven in a mild manner.
Any idea?


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Old 11-18-2012, 07:42 AM   #2 (permalink)
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Time to hit the twisties and get those corners worn down...
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Old 11-18-2012, 07:58 AM   #3 (permalink)
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Well, the first thing you might check would be the accuracy of your tire guage.
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Old 11-18-2012, 07:59 AM   #4 (permalink)
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Sounds like way too much air pressure.
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Old 11-18-2012, 08:09 AM   #5 (permalink)
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When I experienced that problem on my 06 Exige, it was a combination of over inflation and horrible alignment. It was mostly the latter, the alignment acted like a cheese grater to the middle portion of the tire. So I'd certainly check on both.
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Old 11-18-2012, 08:59 AM   #6 (permalink)
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Quote:
Originally Posted by drchris1 View Post
Time to hit the twisties and get those corners worn down...
Thanks for the help.


Quote:
Originally Posted by Simplife View Post
Well, the first thing you might check would be the accuracy of your tire guage.
Pretty sure its accurate.



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Originally Posted by gwkoch View Post
Sounds like way too much air pressure.
25 psi is way too much? A friend of mine runs 21-22 psi and has the same problem

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Originally Posted by mikepal View Post
When I experienced that problem on my 06 Exige, it was a combination of over inflation and horrible alignment. It was mostly the latter, the alignment acted like a cheese grater to the middle portion of the tire. So I'd certainly check on both.
How would the alignment cause that? Im assuming you mean toe settings. Camber should only increase wear on the inside of the tire.
Correct me if Im wrong, but I thought Toe in will wear the outsides of the tires and toe out will do the opposite.

Cheers.
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Old 11-18-2012, 09:47 AM   #7 (permalink)
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R888s?
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Old 11-18-2012, 09:48 AM   #8 (permalink)
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Yes, usually middle tire wear is caused by over inflation.
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Old 11-18-2012, 11:11 AM   #9 (permalink)
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R888s?
We've had the same problem with a048lts and a050


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Old 11-18-2012, 11:12 AM   #10 (permalink)
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Yes, usually middle tire wear is caused by over inflation.
25psi is considered over inflation?


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Old 11-18-2012, 12:04 PM   #11 (permalink)
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You rotating tires at all? I ran 4 sessions on r888s on the same corners and had the "groove of doom." Just have to remember to rotate...tire direction does not matter when it's dry.
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Old 11-18-2012, 12:11 PM   #12 (permalink)
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Yes, usually middle tire wear is caused by over inflation.
This.
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Old 11-18-2012, 08:41 PM   #13 (permalink)
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Yes, usually middle tire wear is caused by over inflation.
Or by driving on railroad tracks.
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Old 11-19-2012, 01:04 AM   #14 (permalink)
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I'm running 27psi in A048s on an Elise and get very even wear (standard -1.5 camber) on the rears so I don't think it is your pressure.

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...
How would the alignment cause that? Im assuming you mean toe settings. Camber should only increase wear on the inside of the tire.
Correct me if Im wrong, but I thought Toe in will wear the outsides of the tires and toe out will do the opposite.

Cheers.
This is more likely - toe setting out will scrub the tyres and wear them very rapidly.
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Old 11-19-2012, 01:24 AM   #15 (permalink)
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I've experienced it on A048's with textbook over inflation. Though it sounds like toe in this case.
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Old 11-19-2012, 02:52 PM   #16 (permalink)
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I run 235/45R17 AD08 with 21psi in the rear, and have the same problem
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Old 11-19-2012, 03:05 PM   #17 (permalink)
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You can get center wear from under inflation too. The center of the contact patch can squirm and resonate due to the low center loading and wear in a pattern resembling over inflation. I would go up a few pounds, especially your buddy running in the low 20psi range.

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Old 11-19-2012, 07:42 PM   #18 (permalink)
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Quote:
Originally Posted by beat View Post
Two of my friends and I have been getting weird tire wear in the rear. Only the middle of the tire is bald with quite a bit left on both corners.


A search will reveal that this topic has been covered dozens of times with the general consensus being that the indicated pressures on the door will typically cause a pair of AO48s to wear in the middle. I’ve gone through probably 10 sets of rear tires (AO48s) and always run my pressures lower for more even wear.
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Old 11-19-2012, 09:21 PM   #19 (permalink)
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Quote:
Originally Posted by Zen Dude View Post


A search will reveal that this topic has been covered dozens of times with the general consensus being that the indicated pressures on the door will typically cause a pair of AO48s to wear in the middle. I’ve gone through probably 10 sets of rear tires (AO48s) and always run my pressures lower for more even wear.
21-25psi is already way lower than what's specified in the manual (28psi)
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Old 11-20-2012, 08:32 AM   #20 (permalink)
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Tire pressure is the common answer to center wear. However, in this case on the rear of an Elise, Exige (or even Europa and Esprit) it is caused by too much toe-in. As a previous post suggested by the alignment checked. It's highly likely you'll find there's nearly 1/4" of toe at the rear. Great for keeping the rear end stable, but terrible on tire wear.

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