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      12-16-2008, 10:20 AM   #26
Nikolas
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Drives: 996 TT
Join Date: Jul 2007
Location: Sierra Mountains

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Quote:
Originally Posted by Native_One View Post
Would the tire diameter be that sensitive? There was about 8 months of wear on them...

Does that mean that all have to be replaced at once?

An engineer that I work with, and former Benz tech, said the system monitors wheel spin based on weight which the lighter tires would be a different equation than the OEM's...
I have never heard of an AWD system that monitors wheel rotation based on weight. That just makes no sense, granted I am no engineer though. Depending on how much wear you had over 8 months, yes it can be that sensitive. Generally with AWD, it is good to replace tires all 4 at a time with the same brand and matching diamter if you go staggered. I think the exception would be if the tires have minimal wear. 8 months could be 10,000 miles. On our cars, that could be significant wear on the tire.
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