Some worthwhile further reading, including worked examples, comparing a wheelset with superior aerodynamics versus one that is lighter.

"... the point of all this was to demonstrate the relative unimportance of wheel rim mass and why aerodynamics matters even when accelerating"

[1] http://alex-cycle.blogspot.co.uk/2014/12/the-sum-of-parts-ii...

[2] http://alex-cycle.blogspot.co.uk/2014/12/the-sum-of-parts-ii...

[3] http://bicycles.stackexchange.com/questions/15047/are-aerody...