Quote:
Originally Posted by 370zDoc
Will the stock 18" potenzas be as bad as the 19" potenzas in snow?
Pardon my cluelessness; first sports car and never had to deal with tire science 
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The stock 18"s are Yokohama Advans, not Potenzas, but yes, they will be equally horrible in the snow.
I recommend going to TireRack to put together a winter setup (wheels + tires). You can do one for the Z for about $1200 excluding shipping.