Presta tube question
05-20-18, 04:55 PM
#1
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Presta tube question
I have issues with the standard treaded presta valve getting stuck inside my pump fitting and have to force it off which has ripped a hole in the tube at the base. I’m now trying to figure out what this type of tube is called that doesn’t have the threaded stem, can anyone help?
05-20-18, 05:18 PM
#2
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They're just called "non-threaded valve stems". Might have to actually open the boxes to find out which ones have them.
But if you're ripping tubes getting the pump off, you're probably doing it wrong.
But if you're ripping tubes getting the pump off, you're probably doing it wrong.
05-20-18, 05:26 PM
#3
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Not sure how else to get it off, I put it on the stem, lock it down then when I unlock it, it's a PITA to get off. It's not a very expensive pump so that could be the issue. I'm not new to cycling so the only thing I can guess is that the pump is the issue.
05-20-18, 06:19 PM
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The wiggling is what tears the tube - a quick straight smack is the best.
Some people have troubles with the unthreaded stems not being grippy enough and the head comes off too easily.
05-20-18, 06:42 PM
#6
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Michelin Airstop is the brand of unthreaded Presta tubes I use.
05-25-18, 07:31 AM
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why is that valve so long?
05-25-18, 08:26 AM
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Put your hand/fingers around the valve and push it off with your thumb.
05-25-18, 08:32 AM
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Could be the pump head is a little gummed up causing it to stay in the locked position even when you release the lever. If you can take it apart try putting some silicone lubricant on the moving parts or if not able to disassemble soak the head in some mineral spirits or even hot soapy water may help. But, as you say it's a cheap pump it may just be ready for the pump graveyard.
05-25-18, 09:26 AM
#10
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I 'm only pushing my Silca pista (track) pump's bell shaped head's gasket onto the smooth band on my threaded P/V stem .
after doing what you may be doing , pushing it on too far, onto the ring nut thread..
presta
and, as an added benefit, not having to replace the rubber gasket,
in decades of use, after that..
....
after doing what you may be doing , pushing it on too far, onto the ring nut thread..
presta
and, as an added benefit, not having to replace the rubber gasket,
in decades of use, after that..
....
05-25-18, 09:38 AM
#11
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Check your rim, if there is a burr around the valve hole, it will ware the tube around the valve stem causing it to come off. I had this problem when I used a Zephal HP. Worked my ass off to get it to 100 psi, then the valve rips out with a 'whoosh' of air. And I'm standing there like a dummy looking at the valve still in the pump head.
A little sanding the valve hole takes care of it.
A little sanding the valve hole takes care of it.
05-25-18, 10:27 AM
#12
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Long valves are the trend -- they work on deep and shallow rims, so it's fewer parts for bike shops and online retailers to stock.
05-26-18, 04:52 PM
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Might be the chuck on your pump. Mine wore out and was allowing me to push it way too far down on the stem and because of that was way too hard to remove.
If you are talking about a normal floor pump, then there are replacement hoses with chuck that can be had fairly cheap. Though you might buy an entire new floor pump just as cheap depending on how fussy you are about brands.
If you are talking about a normal floor pump, then there are replacement hoses with chuck that can be had fairly cheap. Though you might buy an entire new floor pump just as cheap depending on how fussy you are about brands.
05-26-18, 05:06 PM
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05-27-18, 06:08 AM
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A tiny dab of silicone grease in the pump head will help, but I agree with the others that you are probably pushing the head too far down the stem.
05-27-18, 08:19 AM
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Changing a tire on a friends bike, I ripped the valve right off the tube, as I didn’t realize the valve nut was on the inside. Had never seen that before, but now I know why it was done. Seemed to work quite well. Tim
05-28-18, 08:33 AM
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Would also seem to prevent any tube bulge beyond the tire bead at the stem when filling, which has happened to me before since I didn’t get that part seated properly.
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