Are you sure is 18", I just see 19" listed as the smallest wheels for the X6.
Anyway the X6 has taller tires, the front center bore is larger on the X6 and the offsets are pretty different. So it's looks like a bad idea.
__________________
F10 520d M-Sport Alpine White | HRE P43SC 20x9+20x11 | Michelin PSS 255/35+295/30 | KW V3 Coilover | M5 Front Sway Bar + M550d Rear Sway Bar | 3DDesign Front Lip | BMW M Performance CF Spoiler | BMW M Performance Diffuser | BMW M Performance Black Grills | BMW M Performance Pedals |
|