I recently purchased the BMW M Performance 310 Wheels from the dealer. Here are the before and afters:
Winter Setup:
Pirelli Scorpion Ice & Snow
Front - 275/40 R20
Back - 315/35-20
Summer Setup:
BMW M Performance 310 Wheels
Dunlop SP Sport Maxx
Front – 285/35 R21
Rear – 325/30 R21