The whole crr thing has been rehashed many times.
Resistance relates to specific tires, under specific loads, at specific pressures on a specific surface.
"Rolling resistance is casued by rubber deformation losses in the
tread, the tube and the casing. The tube is firmly attached to the
casing by inflation pressure so it is like a tread inside the tire.
The whole tire flexes in three dimensional space, X, Y and Z. You can
verify this typically by laying a stadard business card between tire
and tube. It will shred to fine confetti when ridden. It is this
motion that causes hysteretic loss in the elastomer in the casing, the
tread and the tube. If the tire has patterned tread, such as a knobby
tire has in the extreme, deformation of the tread into the voids will
cause additional loss. That is why knobby tires roill so poorly."
Jobst Brandt
I mostly wanted to stir the s--t. Because nobody can say tire A is faster than B without factoring in all the variables.