The part number on the back of the wheels is BM316007 with a size stamp of 7Jx16H2. I uploaded pics to 318ti site, but can't seem to get them into this post.
The 225/50R16's are a popular size for sure. The tire calculators show them to be 24.9" tall, while the 205/60R16's show 25.7" of overall height. I am guessing that folks like the wider tires better and the low profile better too. Maybe my tire choice is odd enough that I need to learn how to figure how to find the clearance if nobody else has run a tire this tall.
Thanks for sharing what you folks have done.