Given the continuing snow and ice in the U.S., this is very relevant:

From article:
Driving a car with high-performance summer tires is great until the temperatures start to dip.

Summer tires are standard equipment on many high-performance cars such as those from Audi, BMW, Mercedes-Benz, Porsche, and other manufacturers, and the tires are designed to provide optimum dry-conditions performance and good handling in wet conditions.

There is, however, a catch. At 7 C (45 F), their compound loses adhesion and, as a result, they cannot be used safely under wintry driving conditions.

Article continues here with many BMW 3er photos

Freude am Fahren.

<br />
E90 2010 335d
E60 2008 550i
E90 2006 330xi
E90 2006 325i
E90 2006 330xi*
E39 2003 530i*
E46 2000 328Ci*
E36 1996 328iS*
E36 1992 325i*
E30 1991 318is
E21 1982 320iS*
E21 1980 320 (6-Zyl)*
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