205/40/17... Only thing I could use on my Rolla, I even used 5mm spacers on the rear, I had rub on the bottom of the springs... Unsure of offset though, but every set I've tried on had the same problem.
I had 17's on before, literally only for one day (about 10 miles, total). The rears rubbed on the rear spring perches like eage8 said. The front were ok, but a full turn left or right slightly brushed the fender and the inner wheel well covers. Those problems can be worked out. The one thing that was a total bust, the amount of power loss!