My 2004 has a 6-inch wheel. I have always used a 180/55 tire on it. I like the way the bike turns into corners and holds its line. Would I notice much difference with a 190/55? Just curious . . .
190 may rub the swing arm, I have a 5.5 inch rear and always had a 180/55 tyre on it, bike originally came with a 170. Why mess with a successful formula, just my two cents