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  1. #1
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    Presta valve adapter external threads

    Wikipedia indicates schrader valves can have imperial or metric external threads. This might explain why my compressor fitting will thread onto a schrader valve, but not onto my presta valve adapter! I can find no reference to 2 types of adapters - any ideas?

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    coprolite fietsbob's Avatar
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    I've just used either the schrader Thumb-lock or a press on and open the valve to the air compressor..

    If you have Presta Valves , I have a Presta head floor pump. ..

    Silca , it's gasket seals around the un threaded band between the cap thread and the ring nut thread.

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    Understood. I'd like to use my portable compressor (for car tires) that only has a screw-on attachment at the end.

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    Schrader valves all have the same thread -- worldwide. What you see is the identical dimensions expressed in both imperial and metric, but they're the same.

    Externally threaded adapters, usually have the identical thread, but may not be made to the same tolerance. I suggest you take whatever needs to fit with you when you buy an adapter and confirm the fit.
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  5. #5
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    Quote Originally Posted by Beckler View Post
    Wikipedia indicates schrader valves can have imperial or metric external threads. This might explain why my compressor fitting will thread onto a schrader valve, but not onto my presta valve adapter! I can find no reference to 2 types of adapters - any ideas?
    Do you have one of the relatively uncommon adapter that allows a Presta pump to inflate Schrader tubes? Or one of the much more common that allows a Schrader pump to inflate Presta tubes?

  6. #6
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    Quote Originally Posted by HillRider View Post
    Do you have one of the relatively uncommon adapter that allows a Presta pump to inflate Schrader tubes? Or one of the much more common that allows a Schrader pump to inflate Presta tubes?
    Sry, yes standard one that inflates presta tubes.
    Last edited by Beckler; 01-18-14 at 05:17 PM.

  7. #7
    Constant tinkerer FastJake's Avatar
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    The adapters are a pain and don't always work. I'd either drill the rims for Schrader valves if possible or just get a presta floor pump. Pumping up tires with a floor pump really isn't a chore.
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    coprolite fietsbob's Avatar
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    I'd like to use my portable compressor (for car tires) that only has a screw-on attachment at the end.
    Sorry the car tire is high volume . low pressure , A bike tire is low volume at high pressure ,

    so, what you would like is not the way things work . buy a floor pump for your P/V tubes.

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