Quote:
Originally Posted by Opie55
I tried to research this in a fair amount of depth once, although not necessarily for this car. It's rather confusing and seems to be largely theoretical. What you won't find is examples of people saying "my car suffered a major failure and I was told it was because my tires sizes were too far off." Nonetheless, the drivetrain is supposedly unduly strained because the different diameter tires tires rotate a different number of times per mile. Car makers have different recommendations, with 2/32" difference on the low side and 4/32" on the high side. A new tire is about 11/32" tread depth and a worn out tire is about 3/32" in depth. So if you are at 5/32" on one side, a new tire is probably too much on the other side.
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For what its worth all of the seven tires I mentioned that were replaced were all done by my BMW dealer while under warranty and using BMW Road Hazard.