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Originally Posted by Bmw135er
Running a 295 on the back can do that as well. I was running 255/295 and swapped to 275/295. It's definitely different, but not fixed. I think the 295 is too much tire for this car and that's what caused the floating feeling. It seems a lot better with 275s or 285s out back. I do have a proper alignment as well. That being said, I'd like to hear your feedback as well post alignment.
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You are correct. The car does not behave correctly for a number of reasons with a 295 or larger tire out back. The factory suspension parameters and alignment settings need to be abandoned for these sizes to work as well.
Most importantly, if running a large tire out back such as a 295, one should not run an aggressive offset wheel on the front of this car as it further upsets the balance due to track width bias from front to rear.
OP, let me know what your suspension set up is, I can provide you with some parameters to go by to get your M3 back to where it should be.
Malek