Quote:
Originally Posted by engnr1
Have test driven both 18" and 17". On smooth pavement, little difference (17" with narrower tires rides quieter). On rough pavement, 17's more tolerant. Could not really drive the car at track speeds, but the 17's give a nice, lighter (but still communicative) steering feel and handles nearly flat. I think it becomes a matter of taste; still not sure if I am going to get the 17" or 18" wheels. The 18's have a nice muscular look and fill the wheelwells better - but seem relatively common on both S and 2.7 models. In my view, the 17's have a appealing retro look which reminds me of a certain rear engine German 60's sports car. Apparently PAG likes the look as well - considering the visuals of the 2.7 (including the fold-out poster of the red model in the brochure) consistently show the 17" wheels.
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Adding to the above. I too like the looks of the stock 17 inchers. That said, I bought another member's 19" Carrera S wheels and I have to say I've been pleasantly surprised at how nice the 19 inchers ride (both sets of wheels are on Pilot Sports). I also like the way the Cayman looks with the Carrera S wheels. It's a toss up in my mind. You could probably find a better deal on the 17 inch wheels w/tires in the aftermarket than you would on the 18 inch wheels. Compare the factory cost of the 18 inch wheels/tires to the aftermarket.
Bottomline, there won't be a huge difference in ride comfort between the two wheels in day-to-day driving. Effects on acceleration are imperceptible. Handling, of course, is different. I haven't noticed a significant change in fuel economy. If it's changed it may be slightly lower with the 19 inchers, but again I haven't really noticed a difference.
I know you asked about 18" wheels. I'm sharing my experience with the 17" and 19" because logically one would think the 19s would be more extreme than the 18s.