Pirelli P6 185/60 R13 80H were absolutely fine. 185/60x14 you mention would be completely wrong as in going to 14 inch from 13 inch would require a profile drop. Not researched but 185/50 or 185/55 on a 14 inch rim would be more appropriate.
For what reason would it need a profile drop? Gearing? I`ve not had a problem (I was initially on 185/60 14`s, the difference in acceleration wasnt noticeable, the rubbing was however).
I`ve not tried 185/60 13`s so cant comment, the widest I`ve gone on standard steels was 175/60 13`s.