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I would be wary of running big, heavy 17's on a Non-S Cooper. I know others are doing it but it seems to me it would hurt acceleration. I lost 4lbs a corner swapping out heavy Miglias to Konigs and felt a huge difference.
I stayed with stock size 16", but lost almost 16lbs. all around...what a difference, for the better of course!! Less noisy too, don't know how, but it is!!