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Old 01-12-22, 09:00 AM
  #75  
Trakhak
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Removable valve cores were introduced for use in tubular tires, which become expensive throwaway items if a nonremovable valve fails in an otherwise good tire. Manufacturers of clincher tire tubes then began using them too.

By the way, if a long Schraeder-to-Presta adapter doesn't work right for you, the problem isn't the length of the adapter; it's more likely that the cause is the chuck being applied to the valve at an angle.

Presta valves are designed to open from air pressure, not from contact with a Schraeder chuck. In fact, the longer adapters sometimes work better, with compressor hoses in particular, since they ensure that the Schraeder chuck won't interfere with the free movement of the Presta core. The proof is that you can snap off the top of the valve core and the Presta valve will still work perfectly well to inflate the tire. Just be sure never to let the pressure in the tube get low enough to allow the core to fall into the tube.

Of course, when you're out on the road and have to use a Presta hand pump to inflate a tire, you have to be careful to hold the pump at a right angle to the valve stem. Plenty of us who have used a Silca hand pump have had the interesting experience of canting the pump just a bit too far from the correct angle and bumping the valve's inner core, resulting in the pump handle suddenly being launched across the street.

Edit: yes, the exception where long valve adapters might not work properly is in using them with Schrader pressure gauges.

Last edited by Trakhak; 01-12-22 at 09:23 AM.
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