BMW: rims, bolt pattern, style wheels

Question
I have a 1991 525i.  I am thinking of putting on some 18" Breyton style wheels.  18/8.0 with a 5/120mm bolt pattern and a offset of 20mm.  Will these rims fit well?  Should I get 17's or 19's or another size?  Will 18" wheels mess up my steering our cause any potential harm to my vehicle?

Answer
Paul,
 The wheels should fit, however I'm not sure of the backspacing/offset requirements for your vehicle.  Breyton should have a list showing what vehicles can use those wheels.
 The car had 15's factory, so I wouldn't get TOO crazy with size.  18's would probably fit, but you "might" need to roll the fenders.  I would say that 17's are the best bet.

 Hope this helps,
 Josh