Just took my 2009 Z4 into the dealership to get its two rear wheels repaired due to cracking. Yes 19 inch style 296. They refused to repair them under warranty due to the fact that they were bent (out of round). Of course, this was not unexpected. Quoted cost to repair was $1524. I am replacing them all with after market 18 inch wheels and tires. I believe that these 296 wheels are defective for their intended use and that BMW is not honoring its warranty obligations. For those that have had cracked wheels and want to do something about it, I suggest reporting the problem to the following law firm, the FTC and the BBB. Links below.
http://www.kellergrover.com/bmw-crac...estigation.htm
https://www.ftccomplaintassistant.go...d.aspx?Lang=en
https://www.auto.bbb.org/lemon-law-complaint-form/
It could be that it is all for naught, but you never know. If no one complains, nothing will happen. It takes 15 minutes for all three. I would love to see BMW be forced to step up on this issue.