I'm curious as to your input on the following:
I just purchased a new set of AC Carbon 58 wheels with the ceramic bearings and Sapim spokes upgrade. I noticed that when the bike is on a repair stand and the front wheel is spun it seems to take forever for the wheel to spin down. I decided to try an experiment and put two bikes side by side on the stand. One bike with the new AC wheels, and the other with a set of Zipp 404 clinchers with standard bearings. When the wheels were spun simultaneously with the same amount of force the Zipp wheel continued spinning about a minute and a half longer than the AC wheel. I would have thought just the opposite would have occurred. Any thoughts on this? Thanks.
As an aside, I am the owner of both wheelsets. The local bike mechanic that I use who also happens to be a wheel builder opines that the AC hubs are superior to those of the Zipp. Assuming that they build comparable hubs, I would have thought that the ceramic bearings would have won a rollout contest. Perhaps there are other factors that I am not considering.