Can someone explain offsets to me??? I'm new at this. I'm thinking of getting 17" rims for my S. What profile tire do I get, and how much of a drop should I do?

I noticed on my bimmer that I have lower profile tires on the back...why is that??

 

http://www.tirerack.com/wheels/tech/offset.htm

This should give you everything you need. We have wheels listed on our web site that will have the offset to fit your car.
If I can help let me know.

Jim 877-522-8473-364