We have done quite a bit of research on this subject. It turns out that a 265/285 tire setup is just not ideal given the OEM wheel widths. It is important to note that you are sacrificing sidewall support by fitting a tire that is "too wide" for the given wheel width. By running a tire that is bulging, you will negatively impact handling over stock.
To combat this, we ended up releasing a 19" wheel for the M2 and Competition models that allows for the 265/295 staggered fitment with relative ease. A 265/35-19 is a bit too tall up front and can cause rubbing issues under compression, therefore a 265/30-19 is recommended.
We paired a 265/30-19 and 295/30-19 R888R with our M2/M2C specific EC-7 wheels in a 19x9.5 ET28 and 19x10.5 ET45 respectively. This is a
spacer free fitment for those on stock suspension. A spacer is required for those running the M Performance coilover or KW HAS kits.
There is a lot of good fitment and tire information in this detailed thread:
https://f87.bimmerpost.com/forums/sh....php?t=1600433
Here are a few photos from that test fitment!
- Max