Ok, here are some pics to help you to decide. Michelin Pilot Sport Cup 235/40/18. My car is not lowered. I am running -1.6 camber on one side and -1.9 on the other. (for a particular track) I still don't know if the tires will hit the fender under hard braking, it looks as if they may. The pics are from my phone camera but you can see well enough how the 235's fit.

(I forgot to remind you that I have 10 mm hub centric spacers on the front to clear the A-arm bolt. 5 mm spacers wobbled)

Les