I am currently getting a set of 17" BMW BBS (RC 090) Style 5 wheels which I hear came originally on the E39. (I bought 1 in really good shape for $150) I understand the offset on these are is IS 20 mm The offset on my 15" Bottle caps is ET 20 mm. I know the hub diameter on the 17" wheels is 74.1 mm and the hub diameter of my 1989 E34 525i (M20) is 72.56.
My question is: Is there anyone else out there that is running these rims with the same build car as mine. I know that hub centric rings are going to be required. Is Metal or Plastic better? I understand I should be using 235-45/17 tires, right? What problems or issues have you experienced