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Presta to Shrader adapters
 LeoH member offline
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posted 7/17/2019
at 10:42:07 AM
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I have a bike with a Presta valve on the rear, I see adapters that allow you to use a Shrader fitting to inflate the Presta valve, but it isn't clear to me looking at them, how that process goes.
Do you unscrew the top of the Presta valve nipple, then screw on the adapter? I understand the concept, just not the steps involved.

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posted 7/17/2019
at 11:11:58 AM
post #1 viewed 372 times
Yes. Unscrew the presta and screw on the adapter. The nschrader inflator the presses the presta pin down to open the channel to inflate.

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posted 7/17/2019
at 12:00:31 PM
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Yes as far as unscrewing the presta valve then putting on the adapter but the adapter itself doesn't push in the presta valve. It seems to be just a hollow tube with a gasket to prevent air leaking around the threads. Just like without the adapter it should be the air pressure from the pump that pushes in the valve otherwise putting on the adapter would let all the air out of the tube.

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posted 7/17/2019
at 12:36:24 PM
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Thank you. I haven't needed to use one yet, but I've dodged the bullet too long to not have one tucked in my bikebag.

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posted 7/17/2019
at 1:39:07 PM
post #4 viewed 357 times
They are cheap and I have had a couple for a number of years but have yet to use one. I could see using one for the first part of a fill at a service station but would not fill to recommended pressure with an air compressor and not many bike pumps now have only a shrader pump head.

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posted 7/18/2019
at 10:16:45 AM
post #5 viewed 339 times
Exactly why having one, in case, is worth the couple of bucks.

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posted 7/18/2019
at 11:27:30 AM
post #6 viewed 334 times
Exactly why having one, in case, is worth the couple of bucks.

-- posted by LeoH


Just don't put it on the valve and leave it with the presta valve open. Use it when there is no other option for filling the presta valve.

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posted 7/18/2019
at 11:33:42 AM
post #7 viewed 330 times
Exactly why having one, in case, is worth the couple of bucks.

-- posted by LeoH


Just don't put it on the valve and leave it with the presta valve open. Use it when there is no other option for filling the presta valve.
-- posted by ptsbike


Also, if yours is made of aluminum instead of brass, don't just leave it on the valve stem and risk getting it more or less permanently stuck by corrosion. I did! Brass ones don't seem to present that problem.

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posted 7/18/2019
at 12:41:52 PM
post #8 viewed 327 times
You can make one by cutting the top off a plastic Presta dust cap. It is not perfect but it does work. And you must have a few just lying around. I've broken the top off a few from overtightening.
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