A 215 vs a 205 on a 16" wheel is a minimal height difference and the computer won't really know. The 205 would probably be better in the snow because the narrower footprint will have an easier time getting through the snow to the road surface if possible. I ran 215 Eagle GT+4's on my old 89 Cavalier Z24 and never had a problem driving in the snow. I climbed some pretty decent snow covered roads in Vermont too. I really don't think you need snow tires/wheels but if you're really looking to protect your stock rims then I guess it's a good reason. You'll hate the way they ride 95% of the time unless you plan on swapping them back and forth depending on the weather.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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