When you go to bbs-usa.com and look up both cars, they use the same CH015 (18x8.5), but the Z4 M has a note for that wheel saying front axle only. Although, the BBS CH winter wheel is a 17x8.5 for all 4 (CH007), et38. They indicate it fits all 4 corners. My bet is the CH015 will fit all corners too and would make every bit as good of a winter setup as the CH007.
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'08 Carrera S 6MT Guards Red/Black ext leather, Carbon fiber pkg, sport exh, sport chrono +, PASM, Nav, Bose, 19" forged turbos, red tranny tunnel
'07 MV Agusta F4 1000 R 1+1, Corse Red/Silver, RG3 race pipes and factory race ECU
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