I'm not sure I understand how you got to your question from my quote, but anyway…
My comment was in response to 19" wheels alone. I didn't say anything about whether or not he would rub on an 18" wheel. My response was aimed at the OP's first post about whether or not to choose a 19" or 18" wheel. Both could be made to rub, quite easily, but as everyone knows, it's a hell of a lot easier to get a 19" rubbing at stock height, than it is to get an OEM tyre spec rubbing.
Yes, the theoretical situation you pose would pan out exactly as you describe. Those closest match being the 235/40/18 (I owned a set of Michelin PSC's at that spec) and they are very, very closely matched to my 235/35/19s. That was the reason I chose them. But that's another story no? Yes, an 18" will rub with 235 tyres (depending on offset/drop), but few people would choose to run that spec, and the OP had already noted that he'd run a 225/40/18 if on an 18" wheel. So why would I bother to address that?
I chimed in as I have the same car and run 19"s, so the info is based on my personal experience. It sounded like the OP wanted some feedback about 19"s, so I gave him the easy line. Especially as the 19" wheels he talked about buying, are the ones I currently run. Seems fair that I gave some feedback on ease of use/legal tyres etc. If he was any other way inclined he would get the 19"s and make them work like some have, no matter what, like myself.
I've gone through various heights/suspension/offsets/wheels/camber plates I've had offsets around ~30 on 19" 235/35/19 and 18" with 235/40/18 and the stock 225/40/18. There is still a small difference between them (the first 2 I mentioned that is), but it only takes a few mm for it to rub or not. Just like the fender screw mod saved a few people from rubbing. And what was the depth of that screw head – 3mm if that. Same with the fender roll. There's not a lot in the roll – about 2mms of extra width, possibly 3mm before you get to resetting the fender location or possibly flaring/custom body work. And for most who've done the basic roll with mostly normal offsets and legal tyres specs, the rubbing is only on the plastic wheel lining. I know I don't have a build thread to give me scene points for it, but I've been through it, so shared a small touch of advice, which I've now hopefully elaborated on. (Somewhat unnecessarily I think)
I'm sure I could make a whole lot of s*** rub with some 16"s, some bags and frame notching, but I don't think I need to cover that too.
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