Thank you, Humble, for answering with your usual detail!
I currently have 225 45 R18's on 18x8 et 40 Rota Gravels so I figure I can go up to 245 properly. Looking to work with the wheels I have at the moment.
I used to be pretty low on KW coilovers but the long bumper overhangs were limiting where I could bring the car lol! So I went back to factory sport package Bilsteins which are pretty high.
Right now I want to try wider and taller so 245 40 is out for now. I am choosing between 245 45 and 235 45, but I am afraid of affecting acceleration with too tall a tire, so 235 45 has the edge at the moment.