False. ETRTO and ISO, the professional engineers that are experts in this area, specify a max adoptable pressure of 72.5 psi (5 bar). They also allow a safety factor of only 1.1 for blowoff pressure. That means that it’s considered OK for the tire to blowoff at 80psi per the standard. Now keep in mind that’s a static test (no impacts) performed in a lab (no sun softening up the rubber) with brand new, clean parts (no soap residue from getting tire on rim, no corrosion, etc). There are factors that affect the failure pressure that aren’t included and might not even be known. And that all assumes rim and tire quality control is very good. Quality spills happen. Do you feel safe with that margin? I don’t.
Then also consider that many people have crappy air pressure gauges that read off by up to 20%.
Contrast that with the 1.5 safety factor for blowoff pressure that is specified for hooked rims. And also consider that with road hookless you have to use a pressure much closer to the max then you do with hooked, just to prevent pinch flats.
Those are facts. Hard data that does not rely on any anecdotes.
It’s true that the spec should be considered minimum criteria and rim makers are free to design too much better safety factors. But it’s also true that some (especially Zipp) are violating this minimum spec with regards to tire vs rim width.
Everyone that does not have an interest in seeing you hookless rims that has weighed in on the hookless debate says it’s not as safe as it should be for road use. The only ones pushing it have a significant financial conflict of interest or are only armchair engineers.