That's really the question.
The original 14" wheel/tyre configuration was just right for balance & nimbleness. Maybe many would disagree but I reckon increasing the rubber takes more away from the driving than it gives back. That might not be true on the track but it seems to be true for public roads where a greater variety of conditions operate.
There's a money consideration too. For the price of cheap Korean 17s you can get top brand 14s. If you want to put the steelies away I'd look out for some original Mk2 BBS alloys.
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