if you go with the focus rims (16") then yes your tires will be too small. But if you stay with the same size rime you will be fine.

99 contour se debadged "knauberized" fog light mod 17" Enkei CDR9 225/45/17 Contiextremecontacts Alpine CDA-9807 and 2 12" Kicker Comp C12 subwoofers http://members.cardomain.com/ridered81