Blizzaks and a hardtop got my Z4M Roadster through the massive snow fall in DC last winter. I wasn't able to go out on day one, but I was passing large trucks after the roads were snow plowed. Blizzaks did an amazing job of grip, even on packed snow. I never once lost traction. The hardtop was able to withstand several feet of snow on top of it; where as I'm not so sure the soft top would have done that well.
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