Okay, so I've finally got the hang out 17 x --- with --- offsets and fitment. Now I'm trying to figure out 18s. I've found some Advan RG2s (18/7.5+40 5/114 with tires) and am wondering if these would work for the S2000 (modification doesn't matter).

 

No offense, but it doesn't sound like you got the hang of anything. Whether they are 17s or 18s, you don't want 7.5" wheels all around. This is not a Civic, where drivers run 215 tires.

What you need to be most concerned with is the offset of the wheel...40 is getting a little bit low if you don't want to roll your fenders and run a proper tire size. Try to keep it above 45 if you want an easier fit. As far as wheel sizes, if you want 18s, run something like 18x7.5 and 18x9, or 18x8 and 18x9.

 

Nope...still aint got it, broham...you need about 10 more mm to clear without modding and a wider rear rim.