19 or 20 wheels for 350z ??

[ZUL8ERmark]

Ya the 06 07 track or grand touring which it is now called comes with 18x8.5 and 19x9.5 on it and look great and then the new 07 nismo ed has the 18x9 and 19x10 i think soo should be fine

[NSRsheets]

Have the Z book from the dealer right here. It says the optional staggered fit wheels are 18x9 in the front and 19x10 in the rear.

[ZUL8ERmark]

tru tru wasnt sure on the track or the gt but if thats what it tells then lol soo i guess its the same as the nismo then

[nsrZ32]

bigger= heavier= slower

Exactly.

18's are more than enough. The diameter isn't what matters, its the width that's important.