Originally Posted by burnthesheep

Cool.

What about the part though where I said a minuscule detail involving your aero is significantly more important than a watt in the wheel hubs?

Is the concern that they don't spin nice in a work stand, don't roll as far down a small roll down test, or are they sooooooo slow descending that they outweigh the importance of your position on the bike?

I'm a marginal gains kind of thinker for TT, but there has to be some practical application as well.

Also, the whole spin down and little tests done aren't the practical application anyway. You'd need to be able to accurately replicate it at the speeds of concern like a rolling resistance test using a set of rollers and really nice power meter.

Unloaded bearing spin is a worthless assertion of their capabilities under load and at speed.