Originally Posted by
Sy Reene
To your points above, it seems that many of the issues relate to the very wide rim widths being made hookless but for road riding (ie. 25mm ID widths). All of this for the supposed aero benefit.
From the below, a hookless rim with a 19mm ID width is supposedly compatible with every road tire width you'd probably ever want to be able to run, and supposedly, a 19mm rim width allows higher pressures than the 73psi bandied about all of the time.
If you look at rim manufacturer websites the allowable tire widths are far more restricted.
As to the 5 bar / 73psi, that comes directly from ETRTO. So essentially the absolute do not exceed limit of hookless on any size tire is 5 bar / 73psi or lower if dictated by the manufacturer.
I'd love to get the current ERTRO standards handbook but it's 150 €, so a bit too steep just for wanting to know a few things.