Effective difference between high profile versus disc?
 

Currently running a rear disc, but have a 82/101 carbon tubular set on the way. Anyone seen and definitive info of the aero differences between a 101 and a disc (not factoring in crosswinds, which is why the wheelset)

Thanks..

Look:

http://www.analyticcycling.com/WheelsConcept_Disc.html

Difference between deep rim wheel and disk is less than difference between standard wheel and deep rim.

So in real world, a disk wheel gives an advantage of a couple of minutes over and Ironman distance. A worthy upgrade if you are losing your age group by a couple of minutes. Otherwise, save your money, hire a coach and train more. ;)

Going from an 808 front and rear to an 808 front and 900 disc rear will net you about 10 seconds according to Zipp in a 40k tt.

In addition according to Zipp the 101 is a bit slower than an 808 at low yaw but comparable to an 808 at higher yaw and even a little faster way out. So going from a 101 to a disc would probably get you a little more than the ten seconds quoted in Zipps data.