205 is not too narrow for a 7" rim...they'll seat with no issues, and they'll ride handle and wear normally unless over/underinflated. I ran 205/65/15s on my Mustang with 15x7 turbine style wheels years ago because they were free and I was a poor teenager-absolutely no issues. What can get you is the aspect ratio...with a 205 cross section tire, anything less than 55 probably wouldn't seat very well.