Front Rubbing - Tires, Suspension or Wheels?

Its a little difficult since the tire sticks out past the wheel lip, but here is what I did. I put the straight edge against the edge of the tire and measured from the mounting surface = 5.6875 (5 11/16). Then I measured from the edge of the rim to the straight edge = .8125 (13/16). That difference is 4.875 (4 7/8). From 5.5" that's .625" or ~16mm. Summit lists the wheel at -12mm and the Center Line website says 14 lbs (whatever that means).