Squared is the way to go for a winter set-up. Smaller the rim the more rubber on the road. 18" would be the most ideal, but 19" should be ok too. The BMW Store online has some pretty good package deals.
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2018 M550ix|Carbon Black|Dinan Modifications|2003 540i|Jet Black|M-Sport|2021 X5 Mineral White
Prior BMW's: 1987 325e|1993 740i|1998 740il|2001 530i|2002 745li|2007 750li|2006 750li|2001 530i|2012 535xi|
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