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Old 06-23-2015, 01:52 AM   #1
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Default Inside tire wear pattern question

My BFG Rivals (225 on 15x9 6ULs and 949 Big Grip Kit) are wearing strangely during the most recent track day.
The outside edge of the tires are wearing nice and evenly, but the inside edge looks like it's barely wearing at all.
Camber is -2.4 in the front and -2.2 in the back

Is this normal/expected? Thanks.

Inside rear. (also: yay tread splice)



Inside front.



Outside wear, for reference




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Old 06-23-2015, 03:32 AM   #2
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No wear on the inside would suggest lack of negative camber. Feathered edge on the outside would suggest a toe issue. What is the toe setting also do you have access to a pyrometer?

Here are two pictures of the same tyres on the same car with the same pressures but different alignments.




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Old 06-23-2015, 12:54 PM   #3
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Thanks for the reply. Here's my alignment sheet. Toe is set to 0 across the board.

I use a pyrometer to set my tire pressures at the track. I was getting an ~15 degF delta from outside to center on all tires (outside: 128F center: 140F inside 140F)
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Old 06-23-2015, 04:21 PM   #4
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you should be aiming for no more than about 20 deg diff between outside to inside. If the inner is hotter than the outside too much negative camber. Outer edge hotter than inner not enough neg camber or too much toe in. Centre hotter than edges over inflated, centre cooler than edges under inflated.

151, 141, 133 are temps from my data. The average is 141.7 and I could decrease pressure or decrease negative camber. However you also need to look at the difference in the average temps of the front and rear.
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Old 06-24-2015, 12:49 PM   #5
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Quote:
Originally Posted by Eipgam View Post
you should be aiming for no more than about 20 deg diff between outside to inside. If the inner is hotter than the outside too much negative camber. Outer edge hotter than inner not enough neg camber or too much toe in. Centre hotter than edges over inflated, centre cooler than edges under inflated.
That has not been my experience.

Using a tire pyrometer-949 Racing


The OP's tires look fine to me.
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