This about somes it up,
the distance from the inner edge of the rim to the mounting face of wheel, minus the half the rim width(distance between bead seating area), if its negative then your already up against it with clearance.
If your on 14"s then I'd recommened 195/45 or 185/50(expensive if you can find some) though I'm sure 175/60 would be alright, but think the rolling diameter gets a bit large on that profile.
are they the slot mag style one's??