whats the biggest tire a Dart Sport or Duster will fit with comfortably???

I think the largest available size that will fit a 14x7 rim is 245-60-14. I plan on running this size in back and 205-70-14 in front. The 205s are less than a half inch smaller in diameter. I would have gone with 15 inch rims except I have a set of factory mag wheel covers for the 14s.