Wheels are 18" x 8" with 30mm offset and I have 245/45/18 Nokian winter tires on them. The wheels are made by WSP in Italy and are called Neptune GT, specifically made for BMW. Here is a
link to the wheel on their website. They also have a wide variety of 18" wheels for BMW.
Good luck!
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2013 535xi, Carbon Black, beige interior, M Sport package, HUD, DDC & ARS, ACS springs, Kelleners wheels
2010 Z4 35i, Crimson Red, beige interior, 6sp manual, Adapative Suspension
2000 528i, Cosmo Black, beige interior, Sport package (retired)