Originally Posted by
Lascauxcaveman
I've gotten away with that, too. (Though not up to 100psi) If you get a tight-enough fitting tire (smallish for its nominal sizing) on a tight-enough fitting rim (largish for its nominal sizing), you can get away with it. You can also stop and check the sidewalls as you inflate; sometimes if the fit is not fortuitous, one part of the bead will start creeping up and get ready to unseat itself and -- KABLOOEY!
If you're paying attention you can catch this before it blows, and deflate in time. I pretty much avoid playing this game anymore.
Whenever I pump a tire, mounted in a hooked rim or not, I check to make sure the tire is seated properly at 20, 40, 60 and 80 psi