Originally Posted by
Maelochs
Please read better. I inflate the tire to whatever pressure and tighten the nut. The valve is pulled as far as 80–120 PSI allow.
When the tube is less full I can easily lift the stem a little.
Nonsense. Please consider a little physics:
When a tire is fully inflated, the valve stem is protruding as far as it ever will. Try pulling on the stem, it won't move. If you tighten the stem nut at this point, the stem will be held there at it farthest protrusion point when the tire is deflated.
Once the stem nut has been tightened under full tire pressure, you will not be able to "easily lift the stem a little" when the pressure is reduced, as the stem is being held at it's "as far as it ever will" protrude point by the nut that was tightened under full inflation.