Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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If you're talking about the small nut and valve stem sticking up out of the valve, don't sweat it. At anything above 50psi (or maybe even lower) air pressure inside the valve keeps it closed, so the tire is perfectly functional. Breaking stems off was very common back in the day of Silca pumps w/o thumblocks where if you slipped there went the valve. The only issue was that everybody knew you were a klutz.
The only problems with a broken stem are that you cannot check pressure with a hand gauge, and if the valve tends to stick closed, you'll need a nail or bobby pin to "burp" it before pumping. Other than that all is OK, but you might want to put plastic caps on both your valves to hide your embarrassment.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance