[kiwi jetjock]

Hi all. I am a "virgin bimmerfester" and would like some help with tire sizing on a 1998 740 e38.[/B] Still have OEM 235/60/15's fitted but want to change to 18".I know BMW recommend 235/50/18 front and 255/45/18 rear. Will 245/50 or 245/45 fit all round?
What other options are there?
Thanks for any advice