The Valve

My bicycle has Presta valves. Here's the end of one of them:

Presta Valve

Why do I have a picture of one of my Presta valves? Because it popped out of its casing today. This makes it awfully hard for air to stay in the tube.

Update: Well, I just screwed the valve back into the stem. I took a quick 20 mile ride (ha! ha! "quick", right) and it seems to be holding the air. We'll see if the tire's flat next time I go out and look.

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