Was your crr constant regardless of speed? Or was it based on a computation of the sum of all inputs? If the most common theory about why there's a tipping point at the top end of pressure holds true, than speed would be a large factor in crr.

As far as the "feeling" vs. actual performance, my data was based on PM readings from three different pressures. Like you, they were my tires on my bike on my road at my weight at that time.

I'd be interested in reading Zipp's take on the pressures being solely to protect their rims from damage, I was running well above their recommended when I broke my two.

Sure you've seen this, but others may not have.

For me the bottom line is that there are a tremendous amount of variables here, without testing each tire on a variety of surfaces under a variety of loads at a variety of pressures and speeds, we're making semi educated guesses. You're mileage may vary. In the two files from different tests I have, the Veloflex carbons either rock the world or get beat out badly by most other tires. Go figga.

Having been through the wind tunnel I'm pretty convinced that field testing for crr is a fool's errand, though I'm sure we'll keep trying. Extremely subtle changes in head position, hand position, leg position can all effect cda by 20 watts or more.

I've got a set of Vredenstiens to try out next. report to follow.