>>The internal piece is the same on all, bicycles included! 
  Not quite right.  There are 2 different valve stems for bicycles.  I don't 
remember the name but the serious cyclists have something else available due to 
the very high pressures they run compared to autos.  Forgot what it's called 
but I believe both the internals and externals are different.
  Ed in NC
--
  Ed Conen - Raleigh NC
 "I purr, therefore I am." 
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