LeMan's my bad I meant to say it's 22mm in the rear.
The fronts are 20mm and the rears are 22mm. 18x8 and 18x9.5.
Those are the OEM offsets.
I have 19" aftermarket with a 15mm 19x9 and 20mm 19x10 as well as a set of 20x9 15mm offset and 20x10.5 with a 30mm offset.
http://www.realoem.com/bmw/showparts...83&hg=36&fg=15
Offset for the X5 Style 87
http://www.realoem.com/bmw/showparts...91&hg=36&fg=15
45 front and 30 rear. I was thinking of the 19" Spoke 63 but the offset is 48mm front and 45mm rear.
I would like to see them on but also you have to get adapters since the bore size is 74.1 for the M5 wheels.