isn't the 305 the width of the tire and the 40 the height? Or were you just refering to the tire in general?
You think clearance will be an issue...it looks like the car sits pretty high on its "feet" even with 20" installed...or is this an optical illussion?
I have 18" right now (factory) and can't make up my mind..BMW are tough cars to mod..the original rims 19" and 20" look the best, maybe the 20" ACS.
Other question is anything above 20" not going to make the ride less comfortable?