Originally Posted by
terrymorse
That’s not what happens. When fully inflated, the valve stem is pushed outwards by the internal pressure. When the pressure drops, the stem retreats into the rim. If you tightened the valve nut when fully inflated, it will be even tighter when deflated.
Wrong. As the pressure drops, yes, the nut stays pressed against the rim but not with however many PSI of pressure. Maybe you forgot—-rubber stretches. I can pull the stem up easily—- no pressure holding it—-and remove the nut easily.
You don’t use knurled retaining nuts, I do. You don’t know what you are talking about—- sorry but it’s a fact. Having changed who knows how many tubes over decades of commuting and pleasure-riding, and Never having had one stick …. You are doing it wrong, or just imagining stuff. IRL the nuts are tightest when the tire is fullest.