Well this is my question for you guy. Current i have touring 18's and planing purchasing new wheel for my z. which now i'm stuck between choosing 17 or 18 wheel. I want to have 17 simple b/c they are just lighter and better all around acceleration over the 18 only thing that is making me want keep 18 size is i have 4.083 final drive gears launching wise i launch pretty low enough without spinning or get some sort wheel hop (@ 1.25k rpm). Think i will able get the 17 make it up with the proper sidewall height and still keeping vdc happy daily driving?

 

why not 15s as they are obviously lighter than 17s?
my point being that a 17" wheels being smaller doesnt automatically mean its lighter than a 18" wheel.

 

http://www.1010tires.com/tiresizecalculator.asp

 

Keep 18's IMO

Just stick to choosing a lightweight model. There are wheels in 9.5/10.5" widths that can weigh in at 22lbs or less. Off the top of my head those touring 18's are about 28lbs IIRC.

Use a tire calculator to choose a good overall diameter and difference in front and rear diameter so VDC stays happy.

 

Thanks for the advice