scrap pad

presta

Thing I learned about inflating my tires: Presta valves have a screw-tip. So, on the left, the valve cap is on. In the middle, the cap is off, but the tip is still screwed down. Trying to pump the tire up with the valve tip screwed down won't work. I tried it. For a month. On the right, the tip is loosened. This is how it needs to be for pumping.

presta bike tube valve, in 3 positions

(this photo on flickr)

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