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I keep my tire size the same (175-70-13) on my 94 Sentra. I figure the tradeoff is in not reducing the contact patch on ice and on dry pavement. I also do some winter road rallies with it and haven't had a problem. Usually by the time I get to a road (sometimes 50 cars back from the first) it's been swept clean of snow so I can use the extra rubber on the road.
If you're in an area that gets huge amounts of snow all the time, or you run studs, reducing width can be a benefit as the tire is able to bite through all the snow and get down to the surface underneath, which, with any luck, isn't ice. Also, if you have really wide tires, you should go with something more narrow in winter for sure.
Those WRC guys are running God's own set of studs and actually need to dig away all the snow to bite into the ice or gravel, thus a much narrower tire is more effective.
Edit - wait a minute, just how much snow are you getting in Miami Beach?
If you're in an area that gets huge amounts of snow all the time, or you run studs, reducing width can be a benefit as the tire is able to bite through all the snow and get down to the surface underneath, which, with any luck, isn't ice. Also, if you have really wide tires, you should go with something more narrow in winter for sure.
Those WRC guys are running God's own set of studs and actually need to dig away all the snow to bite into the ice or gravel, thus a much narrower tire is more effective.
Edit - wait a minute, just how much snow are you getting in Miami Beach?