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Gees, my 172 came with 15x7s (they did in this country) and - I just measured one - they only weigh 8.5 kg. Sure, the 15" tyre is a bit heavier than a 16" tyre, but only about 1 kg.
trophy turini's with tyre weigh in at about 16 - 16.5kg. I've got some 15" f1 cup wheels with tyres which come to 15kg. You do feel the difference but that could also be due to the slight difference in rolling radius as another factor
1) Braking was sharper. I even swapped them round again, just be sure.
2) The suspension did its thing a lot better... in fact, as soon as std wheels went back on the car, my rear dampers started leaking. Lighter wheels = less work for the suspension.
3) The brakes ran a little cooler too... every little helps I suppose.
4) Tyre wear was very even (could also be due to offset & springs though).
I was very pleased with them. If I get another 182, I'll stick another set of superleggs on again (15's this time).