I replaced the alloys on my Super a few weeks back and put the Super's alloys on my wife's LX. I weighed each wheel and tyre combination and was surprised at the outcome:
Stock steel wheels with 155/70r13 tyres: 11kg/24.2lbs
Stock Super S alloys with 175/60R13 tyres: 12kg/26.4lbs
AEZ "Dino" alloys with 185/50R14 tyres: 14kg/30.8lbs
I had hoped to lose a little unsprung weight with the AEZ alloy and tyre combo but ended up gaining over four pounds. A 17" wheel and tyre combo must weigh at least 35/38 lbs. Not at all good for all around handling on a small car like the Micra.
For a quick tutorial on unsprung weight go to: http://en.wikipedia.org/wiki/Unsprung_weight
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