Originally Posted By: CapriRacer
I'm a little unclear on the question, but rubber valves snap in. They are held in both by the air pressure (which is plenty large enough to hold them in) and the mechanical action.
But I suspect, the tire tech was pointing out that the valve area on the rim was corroded.
Also, when a tire is operated flat, it is not uncommon for the valve to be pulled out. The beads will wedge the valve out. Many people think it was the valve that came out first and caused the flat, but that is exactly opposite to what happened - the air was gone first.
No corrosion. Costco tire tech stated that there is only 1 standard size for valve stems. Found that comment also odd but said nothing to him.
I guess the "mechanical action" failed.
Is the air pressure enough to hold the valve stem in place?. Not to think of a worse case scenario where someone would kick my tire, habit, and accidentally kick a valve stem in causing a flat.. Don't mean to be joking about this but I always kick my tires...habit