Hmm, Here in DK the ST is fitted with 205-45/16.
I found some very nice alloys AEZ Icon 5, ET40, with Michelin 205/45-17 tyres fitted.
I have never noticed any difference in handeling, but my speedometer is now 100 pct. accurate :-)
My ST is not lowered, and I just love the new look of the car every day..
(See my avetar)

\Michael