Old 09-21-18, 05:38 AM
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I used to use Schrader adapters on Presta valves for a long while. There is a tiny rubber o-ring inside the Schrader adapter, and as soon as that o-ring falls out (and it can if you aren't careful removing the adapter. if you do lose the o-ring the air will leak out almost as fast as it goes in.

If that's not it .... maybe you damaged the Presta valve while screwing on the Schrader adapter.
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