Originally Posted by
wilson_smyth
The results are also not hugely useful. They find, almost every time that a stiffer harder tire has better rolling resistance, and most tires have lower rolling resistance at their highest psi, but it's well kown that in the real world, running a rock hard tire at its max psi is not beneficial to reducing rolling resistance.
To follow their logic to conclusion I think if they tested a thin solid wheel it would have fantastically low rolling resistance, and technically top their tables, but it's real world usage would be non existant.
For these reasons I take all results on that site with quite a few pinches of salt.
You might want to read the series of articles on the Silca site
https://blog.silca.cc/tag/technical/page/2 where they discuss how to properly interpret the results of a drum test. They also discuss impedance, where road roughness causes a sharp increase in rolling resistance. If you understand impedance and why you would never operate at pressures where it occurs, it makes perfect sense not to test tires for those conditions.