Quote:
Originally Posted by anthonyk
That's weird. I've used presta exclusively for about 15 years and never had a leaky stem. Are these budget tubes or something?
I guess all my rims have been drilled for presta, so maybe it's the grommet that's causing problems. I usually keep the nut on the stem cinched down pretty tight, and maybe yours are moving around when you ride and causing problems. 
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I believe the last two were seamless Continental tubes.