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Stronger wheels, lighter wheels, or truer wheels all would be improvements. Larger wheels by themselves may not be an improvement. Lower profile might enhance handling, but two years ago Road & Track tested 4 different wheel sizes on a BMW and found the stock size to offer the best performance. Why - the suspension was tuned for the stock wheel size.
Summer and winter tires and wheels are your best bet.
Road & Track has also discussed why performance tires are a very poor choice for winter. Among other things, the softer rubber used in performance tires loses a good deal of its grip when it gets cold.
If you are going to buy new wheels and tires, why not use your present wheels for the winter?
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2 8s & 2 7s 600,000 miles total
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