For normal road tyres and no grief go for 215/35/18’s.
Start going bigger and you may run into issues.

Also so don’t forget the track tyres like r888’s etc have a bigger diameter and width than a road tyre of the same size, so they will come up bigger and possibly rub.

I had t1r toyos on my old 18” rims and with over 500hp it was like driving on ice, they were terrible.
Mid you need grip go with some decent track tyres.
Leave the 18’s for show type use

Cheers Paul