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      11-12-2012, 11:04 PM   #24

Drives: 2009 Z4 35i
Join Date: Jun 2012
Location: San Francisco Bay Area

iTrader: (0)

They did not remove my tires before checking the wheels for out of round.

However, as I argued above, a wheel can become out of round through normal use and not as a result of a major impact. I believe the weak wheels bend over time, ultimately resulting in cracking. I caught the cracks in my wheels early and they were so small they just looked like pencil lines. I believe they bent before they started to crack.

The extra width of the rear tires and 2 degree negative camber have to promote cracking in the rear. My guess is that there may be other suspension differences between front and rear that would contribute as the rear wheel cracking as well.