I have an X6M that I have been tweaking a bit since I bought it and have used a set of alloys from my previous vehicle to achieve a square setup. I now run a 22x10,5 ET38 front and back, with 295/30-22 tires. Has to be said that I also installed fender flares to give it a more aggressive stance, so I have used spacers front and back to bring the rims out somewhat.
Works great