Originally Posted by
seypat
The question I would ask is, "How many people have valve stem caps on their automobiles?" If you don't, then you can say the caps aren't important. If you do, then you're talking out of both sides of your mouth.
Is that a dare to come up with some BS argument about why they are important on Schrader stems, but not Presta? I'll bite:
Schrader stems are basically hollow at the tip, so more prone to dirt collection.than a screw-tipped Presta. Basically, the Presta is self-capping.