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I was asked if there was any advantage Presta valves had over Shrader valves. I didn't know of one; do any of you?

Dancer
 

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Dancer said:
I was asked if there was any advantage Presta valves had over Shrader valves. I didn't know of one; do any of you?

Dancer
Yes. They're much easier to fill at high pressures. With a shrader valve there's a spring holding the valve closed, and you have to depress the core to inflate. You always lose some air when you take off the pump head. With presta, air pressure alone keeps the valve closed (no spring), so it closes securely at the end of each pump stroke, and you lose no air when you take off the pump head (nor when you put it on, for that matter). Presta is MUCH better for bike tires, with their high pressures and low volumes (compared to, e.g., car tires).
 
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