Both of my rear aluminum wheels have cracked without any accidents occurring or even anything other than normal driving. both times my tires needed replaced. i have owned 20 cars in my life and never had to replace a wheel. now with this bmw i have had to replace all 4 wheels to ensure it doesn't happen to my remaining two wheels. in my discussions at tire centers this is said to be a very common problem with bmws and in my opinion is consumer fraud. *tr