Assuming no other difference between 17" and 18" rims besides the diameter (double check), I run 205/50R-17, 225/45R-17 Blizzaks on my winter rims. No issues, but the rears definitely look very narrow. But you want the tires to be as narrow as possible with snow tires, so they cut instead of plowing through the snow.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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