Originally Posted by
PeteHski
I think you need to chill out and have a beer or something. I don’t see disc brakes adding any more aero drag than rim brakes given their frontal area. Especially if the frame design is optimised around them. I’m pretty sure Pinarello are saying that their new Dogma is fractionally more aero in disc form. Not that the difference would be significant for the average rider or even a pro. My point was that rim brakes are not going to make a comeback on the basis of being more aero.
There's a recent Nerd Alert podcast that interviews the guy at Cannondale responsible for their SuperSlice TT bike. There is a fair amount of discussion about the the use of rim brakes vs. disc brakes on TT bikes. One data point is that
any set of brakes costs about 2 W at 30 mph, but it's easier to reduce the drag of disc brakes (if you're worried about that teeny weeny amount of drag.)