Originally Posted by
Sangetsu
Lower rolling resistance with modern clinchers is accomplished by gradually making the rubber thicker in the very centre of the tread, meaning that the contact patch is the same size as narrower tires which had a uniform tread.
The contact patch size is set by tire pressure.
Contrary to what some people believe, higher pressures and harder compounds always result in decreased rolling resistance.
Not outside the lab and velodrome. Past some point on the road Crr goes up, presumably because road irregularities are no longer being absorbed by the tire's compliance.
From Tom Anhalt's measurements on rollers indoors and via Chung's virtual elevation model outside
