I'm running 18's front (9) and rear (10) both w/ 20 offset. I have 255/40 on front and have 285/35's currently, but had 275/40 mounted on the rear previously. No issues running this setup. you should be fine.

 

Well, thanks to all the input, I went ahead and bought a set of Enkei GTC-01 18x9+18 and 18x10+22. I should have them in a week or so and will post pics when I get them.

 

Fenders are not rolled at all. Now that i revisit this thread i think you'll fine.

 

I'll know for better or worse in the next week or so. Watch, I'll probably put these on and decide they're not aggressive enough!

 

Blitz BRW Profile-8? I think I recall that being there typical Z/G size offering. I considered them at one point, but they were heavier than I wanted for an 18.

 

Okay, just to give resolution to this for anyone who might search it in the future. I got the wheels installed (18x9+18F, 18x10+22R) and am running 245/40/18 up front and 275/40/18 in the back with no rubbing.

I also installed a Hotchkis TVS kit at the same time for a modest drop and still no problems.

It looks to me like this is pretty maxed out to avoid rubbing without rolling the rear fenders, but now I'm kind of hooked and wondering what a wider tire would do...

In any case, coming from a +30/+35 offset on narrower wheels with the same size tires and a stock suspension to this has given new life to my 6-year old car!

Sorry for the crappy iPhone pics, but I think you get the idea:

 

if you want to go wider in terms of tires for those wheels, no more than 255/35 for the fronts and and 285/35 for the rears.