Originally Posted by
Spoonrobot
I've found the additional hysteresis losses from pedaling large tires at low pressure can at times overpower the improved rolling resistance.
'rolling resistance' is another name for 'hysteresis losses'. Given two tires of
identical construction, the wider one will generally have lower rolling resistance(less hysteresis losses) than the narrower one at a given pressure, and presumably could be run at a lower pressure than the narrower one and have the same rolling resistance (hysteresis losses), or at a much lower pressure and have greater rolling resistance (hysteresis losses).
In my experience, the difference in aerodynamic resistance of a wide tire compared to a narrow tire is greater than the difference in rolling resistance when riding fast, and the weight might slow you down more on hills than you would gain from the improved rolling resistance.