I am running 255/40R17 and 255/35R18 tires on 8.5″ wheels, each with a 40 offset. My car is lowered 0.25″ in front and 0.5″ in the rear compared to stock. My coupe could take a smaller offset (32-35) or wider wheel in the rear without rubbing, but I don’t think sedans are quite as roomy.
FWIW Kris Linquist (krisl) had a post stickied on bimmerfest for a while which had a link to a much larger database than what is preserved in the bfest wiki. If you search for it you could probably turn it up. I don’t know if the database is still around.