FWIW, a 30mm external and 23mm internal will contain a 28mm tire inside it’s profile. But just barely. ERTO standards say you shouldn’t run anything on a 25mm hookless rim narrower than 29mm. I think there is just too much being given up there (illustrated by the data Marc found) just so the manufacturer can save a couple of dimes per rim.
is this no longer current?
because this shows a 28mm tire going on a 25mm internal. me, i always run 5mm to 7mm delta between nominal tire size and internal bead width. that’s to me the sweet spot. 28mm on 23mm internal width, 30 an 32mm tires on 25mm width. but you can certainly run a 28mm tire on (say) a zipp 353 NSW by this chart, tho this chart is from 2022 and something might’ve changed to which i’m naive.
as to your view of hookless, all my favorite road wheels are hookless. maybe it’s a fluke. maybe it’s a coincidence. but this debate feels a lot like road disc brake. “we don’t need it.” “you’re pushing something on us we didn’t ask for.” but the difference this time is that everybody has plenty of hooked beads to buy and i expect that to remain the case for a long time.
FWIW i put my wife on shimano wheels, in some part because of hooked beads. i don’t trust her to always use the pressure gauge i have her when she inflates her wheels. one very real - and in my view the only - drawback to hookless are those who just don’t understand the pressure restrictions and aren’t likely to focus on them in the course of their riding.
