Bicycle tires are bias ply, so the cords don't separate as the tire swells, like a radial. My tire engineer warns against exceeding sidewall rating by more than 10 percent. Orris says the first thing to fail should be the sidewall. Steel rims are formed from one piece of sheet and will not fail, but some aluminum rims might fail by the flange breaking off. The rim fragment will be a bullet.
Organic materials can spontaneously com- bust in it.
When this happens the gasses expand even more and what you have is a one-cylinder engine with no crankshaft and no exhaust valve. Navy has one serious accident a day from high-pressure air. Tires have a warning on the sidewall not to exceed a certain pressure to seat beads. Usually it is less than 125 percent. Most of the tire-explosion problems we have seen are from putting tires on the wrong size rims.