I went to
18" V Spoke 281.
Dunlop SP Winter Sport 3D Run-flat
From my BMW parts dept. for these guys.
For my 550i i would not want to drop to 17" wheels. This is one big, heavy car. I miss the 19's for fair weather days.
The 18's do ok. I haven't had much snow, but with wet roads, the Wintersport 3D's are working very, very well.
12 550xi Dark Graphite Metallic II. Convenience, Cold, Driver's Assistance, Premium Sound, Sport, BMW Apps