70-75% of drag comes from the rider who has much more surface area than their components and relatively horrid (.75 on the hoods, .8 on the drops which are faster due to reduced surface area and therefore CdA which isn't much better than a flat board at 1.0) drag cofficient.

Fast clothing and positioning will do more for you than wheels. especially where the comparison is against contemporary alloy wheels (somewhat aero, 25-30mm deep, 14/17 gauge spokes) not the box-section straw man companies trot out to make their product look better.

Here's the FLO data at 30 MPH - the non-disc carbon fiber wheels are only a big win with enough side wind to generate lift. Note the open pro up top.

http://www.flocycling.com/aero.php



For comparison purposes, total aero drag can break 3000g at 30 MPH in a road bike position.

Good numbers are hard to come by, although Biggest Bang For Your Buck In Time Trial Equipment | CyclingTips gives a time-trial biased info graphic which is interesting



Last year's aero jerseys (Louis Garneau Corsa 2.0, Castelli Aero Race 4.0) are currently $100 close-out items at competitive cyclist, and new prior year sizing samples (LG Modo) $50 off ebay.

I got myself a Corsa 2.0, and liked it enough to add a Mondo to cover two hard days a week without intervening laundry loads. Comfortably snug like a nice pair of cycling shorts, no annoying flapping anywhere, and very good at wicking sweat.

I want to see how aero jerseys compare to skin suits, actual race-cut jerseys, and regular euro-fit as opposed to the over-sized club fit straw man and if I can't find data am tempted to play with my power meter and rchung's virtual elevation model to estimate CdA.