Thanks Bennito. You would have seen a lot of clean sti's during your time in Cape Town no?
The 17"s ride ok. I changed from a coilover system to a conventional spring and strut setup with a less aggressive drop, so the ride is not harsh at all. However, though the 17s have firmer sidewalls which might make handling better in certain instances, it's as if the firmer sidewalls lend themselves to more wheelspin. Even unintentional wheelspin and chirping when taking off at the lights. 15"s with more sidewall and more elasiticity in the sidewall seem a little more forgiving here in my experience.
I just had the 15"s on a scale. 9.2kg or +/- 20.2lbs each. I also weighed my 205/50/15 semi and it's the exact same weight. A regular street tyre should weigh nearly the same Id imagine. Looking at Kumho KU31s for the wheels.
@ BenFenner the 17's have a bit of concaveness to them. Just at the end of the spoke they turn in. I know its kindof a paradox but good, concave rims are not readily available in SA. Unless you import.