After posting the pics of my '03 Z4, it was suggested I get new wheels for it. I'm totally ignorant as to what will and won't go with my car. Can anyone tell me the ups and downs of 16", 17", 18" and 19" wheels? Performance doesn't mean much to me, I'm past the boy racer stage and it's mainly aesthetics that concern me. Do I have to fit spacers etc.? I had a look to see if there was a faq and read a few of the posts in the forum, but a lot of it goes over my ignorant bonce. The wheels I have fitted are the factory ones.