Do any exist? I want to easily use a gas station compressor without worrying about popping my valve core out when I unscrew the adapter after use.
No, I don't want to "just use Schrader-valve inner tubes".
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3I've never seen one that did screw onto the valve core.– Daniel R HicksFeb 5, 2021 at 13:56
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1I have a track pump with a chuck for Schrader to which came with a press-on unthreaded adapter for Presta.– CarelFeb 5, 2021 at 14:37
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2Consider that if your valve core is loose enough to back out with the adapter, then it was already loose enough to leak air anyway, or worst case, back itself out completely while riding and be lost. Trying to find an adapter that lets you leave the core "loose" seems like an XY problem.– Criggie ♦Feb 5, 2021 at 21:59
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1@DanK Yes, but those screw on the valve core, not the threaded area below it. You can tell because the rubber o-ring seal is closer to outside than the adapter's inner threads.– Gregory LeoFeb 6, 2021 at 0:39
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3@Criggie I cannot agree with that. I have unscrewed the core even when I have tightened the core right before putting the adapter on. There was no losing air whatsoever even before that. This is a good question and no XY problem.– Vladimir F Героям славаFeb 6, 2021 at 9:44
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2 Answers
Never seen one myself - there are pumps that have push-on "speed" adapters for presta, but they are part of the pump head and you wouldn't find one at the service station.
The best fix is to unscrew your valve core and add a small dab of hand-strength threadlocker. The Locktite one is normally blue, but other brands have other colours. Then reinstall the core and snug lightly. You can reinflate immediately.
Once this is done, there's much less chance of the core coming out with the thread-on schrader adapter which you still need.
Another possible solution is to simply carry your own pump and not depend on machines. A quality presta capable minipump is cheap enough, and will be with you if the puncture is far from civilisation and fuel stations. Minipumps are slow and tiring, so you might choose a "small floor pump" which are faster but larger, while remaining smaller than workshop-sized floor pumps. I have one and its somewhere between the two for speed. Or you could carry CO2 sized for your presta tube.
You should always carry the small threaded schrader adapter too, along wiht the usual on-bike tools and emergency spares like master link and tyre levers.
SKS makes a press-on adapter. Unscrew the valve nut, push the adapter on, use the schraeder head on the air hose, pull the adapter off and thread the valve nut back down. Tell your shop it's p/n PU4001 from Q.
