I recently purchased a set of Easton EC90 Aero wheels, full carbon, clinchers, campy, weigh in at about 1500 gm mol. Immediately have noticed 1.5-2 mph average speed on 50-75 mi ride. Rode the Hotter'n Hell 100 yesterday in Wichita Falls, Tx 5 of us went 100k in a five man line the whole way, averaged right at 22 mph. Today we went and climbed Mt Scott in the Wichita Mts near Lawton, OK, about 1000 ft vertical in just over 2 miles. Rode the same wheels, they climb very well also. I also believe it has been said that aero trumps weight even going up hill.