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      06-24-2015, 06:00 AM   #4
ND40oz
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Drives: M2 CS
Join Date: Dec 2009
Location: Denver/Frankfurt

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Quote:
Originally Posted by Blubaron79 View Post
I always wear my rear tires out first. After a week I'm sure I'm off by 20%. Ran my 2009 xdrive hard to 120k miles. Never a problem. (They were staggered too)

Just don't run different tires.
There's no possible way you could be off by 20%. That's like having a 30" circumference tire and a 24" circumference tire.

The stock 19" wheels using a 225/40/19 and 255/35/19 have rolling circumference of roughly 26" of which a one percent difference would put you at 25.74". Considering the tread depth of the Potenza S001 RFT is only 10/32 of a an inch or .31", you'd have to have a new tire and an almost bald one to have them more then .26" in circumference difference.
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