For a winter/snow tire, going as narrow as possible will result in best snow performance. I would not do 245 in a dedicated snow tire. You might as well just go with all seasons then.
Which specific bridgestone blizzaks you looking at? Personally I went with a square setup of michelin xice2 in a 245/50/18 for the G (same as front tire). I didn't like the super soft sidewalls of the bridgestones (ws-70).
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