I am so relieved to hear that I am not alone in my struggle to pump tires with Presta valves! There are days (rare indeed) when all goes well on the first attempt, but for the most part I have to allow far too much time for this task.
When it suddenly *does* work, I have no idea what I did that was any different from the multiple frustrating attempts. My biceps are getting quite a workout, though.




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So it sounds like Presta valves are known for this, and that it isn't uncommon to have problems with them when you first start using them. This is good to know. I feel better about it now... so practice, practice, practice sounds like the key?
