Originally Posted by
msu2001la
Oh -sorry if my posts come across as argumentative - not my intent. You're correct that in practice I am not likely to ever run anything narrower than 28mm on my own 23mm i.d. hookless rims, so it's a non-factor for me. I mostly just want to try to understand the limitations and technology involved.
Oh, no - not what I meant.
The easiest explanation is this: ETRTO recommendations have always been conservative. Go back a few years and look at recommendations for tire/rim combos for regular clinchers and you'll see that it was pretty routine for users to operate outside of the recommended parameters, 'specially once players like HED started widening rims. But yeah, practically speaking, it's less likely that users would
want to use combos outside of what's currently recommended. If I wanted to run 25s on my 303S (I don't), and the calculated necessary pressures looked okay, I wouldn't be too ascared about it, though.