On the Z4M a good 17" winter setup (assuming the wheels fit over the rotors) would be 225/50-17 with about 40mm offset in the front and 20mm in the rear.
The 225/50-17 tyre size is closest in diameter to the OEM 225/45-18 front and 255/40-18 rear sizes.
For the past 5 winters I've been very happy with my 225/45-18 Sottozero setup on 18x8 OZ Ultraleggera wheels with 40/20mm F/R offsets.
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