[kn7671]

For those against the 20" wheel thing, with the 2015 Mustang right around the corner, I would assume that there will be a 20" wheel/tire option available from the onset. Here's a quick history on the tires sizes offered:

1979-84 Mustang = 14" (forget the Michelin TRX metric sizes)
1984-86 Mustang SVO = 16"
1985-90 Mustang GT = 15"
1991-93 Mustang GT = 16"
1994-04 Mustang GT = 16" std, 17" opt
2005-09 Mustang GT = 17" std, 18" opt
2010-14 Mustang GT = 18" std, 19" opt
2015-?? Mustang GT = 19" std, 20" opt

I ride on 19" Brembo's, but 20" wheels in a few years will look pretty normal on a Mustang from the way the trends have gone over the last 35-years.