from what i used to know before about offset is there is the negative offset and positive offset.if u want to have the deepdish look u'll need to go with negative offset and vice versa for the positive. however after i read through a lot of web site for wheels and in this forum all i see is +20, +30, or +40 which i don't understand at all what those terms mean so i'm just thinkhing that someone could explain it to me and if u can also tell me how to convert it to those plus and minus system that would be great.
another thing, i was looking around to searh for wheels on sedan and i found this set
18*7.5 +40 fr and 18*8.5 +43 rr
what would this wheel look on the sedan (will it fill the wheel well)

 

They should fit fine. Here is a link to some 40mm offset wheels on my G35C. Should help you somewhat

https://g35driver.com/forums/showfla...sed&sb=5&part=


BillR
G35C Laser Red, Prem, Nav

 

actually the specs were from Nismo GT4 wheels so it should fit no problem but what i really don't understand is what are all these numbers??? +20 +30 +40 could someone help straighten things out for me

 

the positive offset is "x" mm from the center of the wheel towards the outside where the wheel bolts on.

This link should help
http://www.tirerack.com/wheels/tech/offset.htm


03 CB G35 Coupe 6MT
estimated arrival - 5/6/03