I want to upgrade to the Nissan factory six spoke 18" wheels. I have seen plenty 8" AND 8.5 inch width with varying offsets advertised here and on EBAY.

What is the width and offsets of the factory 18" wheel that is optional on the 350Z?

It is my understanding the fronts and rears are identical...now I am not so sure.

Will tire pressure sensors on the standard 17" factory wheels work on the 18" wheels?

 

Performance - 18"x8" with I believe a +30 offset Front and Back
Track Model - 18x8" Front +30 Offset / 18"x8.5" Rear +35 offset

I'm pretty sure thats right. Unfortunately I can't answer your question about the TPS.

 

Performance/Touring - 18x8 - 30 offset
Track - 18x8-30 front, 18x8.5-33 rear

(According to pg. 9-9 of the 2005 350Z owner's manual)

 

Never thought to check the owner's manual. I have seen EBAY offering 8.5 wide rears in the same 6 spoke style...perhaps in error.

 

Damn I was real close.