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BDC: Rubber is pretty darn heavy. I was always under the assumption that unless you were going for over-the-top bling that the tires were heavier than the wheels. Remember, tires are all *steel*-belted radials and they have metal in them near the outer diameter.
From tirerack.com's published specs for Michelin Hydroedge tires are the following weights compatible with the wheels you listed:
185/70r14: 19 lbs, 893 revs/mile
185/65/15: 19 lbs, 856 revs/mile (a LARGER tire, same weight/width shorter sidewall)
205/55r16: 23 lbs, 839 revs/mile (a 215/65r16 is 25 lbs at 776 rev/mi)
215/60r17: 25 lbs, 770 revs/mile
Clearly rim size is not the sole determining factor of tire weight. A shorter sidewall can even offset a slight increase in outer diameter for a given width. A larger diameter tire for a given rim and width is heavier. Also tires are much heaver than the (admittedly already light) wheels you listed.
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