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Exactly!  Not only unsprung, but also rotating mass.  They say that 1 unit of unsprung rotating mass is equivalent to 4 units of fixed sprung mass.  Thus, your 15.5 lbs of weight loss to wheels is approximately an equivalent to removing 62 lbs of weight off the frame.  Can't wait to read your ride report.  Now how do I convince the wife I need new $4000 wheels??!??