My valve doesn't let air out when you press down, When you unscrew it to loosen it to put air in it then try to screw it back in it let's air out right when you touch it, Funny thing is the back tire is an old school valve with a center pin and it works fine
Thanks, BikeBlogger-- your video helped me understand why my presta valve was leaking--- didn't even KNOW there was a "core" that could become loose. Just tightening it did the trick. Thanks a bunch!
Thank you that solved my problem that I´ve been fighting with a lot. Now feeling pretty stupid not figuring it out by myself but main thing it´s now finally fixed!
Perfect, thank you! This will save me having to replace entire tubes every time one of my valve stems gets bent. I wish I had thought to google this years ago.
Thanks for saving me from needing to return the tube. As others have stated - what a stupid design. I've had so many problems with the Presta valves over time.
I've had presta valves for 20 years and changed bike and had 3 duff tubes so far all leak 2 continental with removable cores and one that came with the bike. I think I only replaces the tubes once on my last bike and I used to ride tons, now get a flat every 20miles which is absolutely ridiculous
Hi very good video I recently had got some continental tubes for my bike which is presta. I went out for a ride and thought what, tyre is flat not gone over anything these are brand new tubes. After walking home and next day taking cap off I discovered the valve had come out and stuck in the cap. Being new to presta I thought it must be a faulty innertube so complained to Amazon and they sent me out 2 replacements. Now knowing from this video that it was because the valve was completly loose, which caused the problem. It has given me knowledge and others who see this video who did not know. Thanks
Incredible video….now I know exactly what to check for without automatically assuming that I need a new stem. Was puzzled why I couldn’t figure out how the stem was losing air.
I also have Continental tubes, I actually bought a bunch of them in bulks and I think that most of them have this issue of being not screwed strong enough because air escaping my tubes is a common problem. Thanks a lot for the clip! hope it helps, might update in a few months if it does.
Oren I have been having the same issue with Continental tubes. I was thinking that the batch I bought was defective? Have you had issues since correcting this problem? Much appreciated.
*Schrader valves on bike inner tubes only support a max PSI of 65 so that's why the Presta valve was invented. Yep, they're a pain to maintain, however thanks to the presta valve we can put 120 psi in bike road tires and roll faster.*
@@wrxgereboost *Schrader valves on bike inner tubes hold a max psi of around 65 psi. Schrader valves in general hold a max psi of 15,000 psi, but on a bike tire you are mechanically challenged if you believe you can safely pump 120psi into a bike tire with Schrader valve.*
I'll agree to that lol, the actual shrader on a bike doesn't go higher, but like you said shrader in general do, just saying it would be better off to have a new version of shrader for a bike than ever use presta again
@@wrxgereboost *Yeah I personally resent the presta valve however I like to go fast on my Continental Contact Speed bike tires and they won't roll fast and easy without at least 100 psi in them so I tolerate the Presta.*
My tube had a slow leak. Cured it by screwing in the valve core tighter. I guess it loosened by my overdoing it when I loosened the sleeve to pump up the tube. I think the leak path is along the threads between the core and the stem.
TopTip - I have just removed my stem valve following puncture repair inspection revealed Soaps water suds at the tip. I wrapped a small amount of PTFE tape around the stem thread and replaced it. No more leakage 👍🏻
Just a got a used road bike with Presta valves and one tire had a slow leak I knew NOTHING about Presta valvesso you helped me out big time. I won't buy a new tube until I try your trick Mine had no caps, should I buy some? Thank you again .
just a side note: when I went to release the presta knob to add air, the knob sheared off from the long stem that goes down the core. It happen twice on both the front and rear tube. If this happens to you, you can order new presta cores to replace. Just make sure your tube allows for replacement because some don't. but remember that you have to remove the old long piece of stem that is still inside the tube or you can end up puncturing the tube from within. this is what I did to find it quickly. 1. add the new core to the tube. 2. add air to the tube like blowing into a balloon. close off the stem. you just need enough air to be able to hear the long piece of stem floating inside the tube. 3. listen for it as you shake the tube slowly. Remember you want to make sure the piece inside drops towards the stem. 4. once you hear it, locate it by softly pinching the tube until you feel it. make sure you hold on to it. 5. As you are holding it, remove the new stem core that you installed earlier. 6. Now, there should be no air since you removed the stem core. 7. kind of guide the stem core piece towards the stem hole and feed it into the stem. 8. once you know that it's inside, tilt the stem downward and watch it fall out. if anyone has a better way to remove, then let us all know. in the 30 years of cycling I can't recall that I have ever had a Presta knob shear off from the stem core. kind of weird or just cheap tubes. they are from Specialized. The tubes are still good other than the presta valve breaking off. it took me no more than 5 minutes for the whole routine. If you would like a video, like my post and reply.
There is another reason to remove and reinstall (the same) core -- sealants. Say you get a flat around 1h ride from home. You unscrew core, put some sealant into the tube, insert core back, inflate the tube, rotate the wheel, wait few minutes and you can get back home without entire procedure or removing entire wheel, changing tube, etc.
@@95Geli 1:36 OP states the ONLY reason you would like to remove the valve core is when it breaks which is not true, because there is pretty good reason for removing it -- putting sealant inside the tube in case of the puncture, as I described above.
OK I ran into this one this afternoon on the wife's bike and was unaware about the valve core possibility. But I removed the existing inner tube and inflated it outside of the wheel and it keeps pressure. Then I installed a brand new inner tube fresh out of the box and it does the same thing - on an inner tube that's brand new! Looking, the rim tape on the wheel looks intact/good and the wheel itself doesn't seem to have any sharp edges that would cause it - I've been using presta valves since the early 2000s and now I have two "bad" ones in one hour? One on a brand new inner tube? Tire looks hardly ridden as well.
Thanks for your video. The presta valve broke off of my back tire. I picked up an inner valve core to replace it, but I can't get the original one to come out. It appears that the valve core and the stem are one piece. I can't unscrew it. Could this my problem? Are some made this way? Cuz if it is, I need to bring the bike into a shop. I'm not real bike tech savvy, but I try smaller fixes when necessary. Any advice would be greatly appreciated!
I can hear mine leaking. But I cannot get it to turn out. It seems the whole stem turns not just the core. There is nowhere to grab the stem to stop it from turning. Maybe I should use a cloth and some pliers. Should it be this hard?
After i inserted the pump head, this valve leaking when pumping in air. When i remove my pump, no leak again. Was it deal to the same problem? Valve loose? Thanks
Easy enough. The presta valve may have been slightly bent but my pump pulled the whole thing out. Here's hoping I can just replace the core. The tube was new.
Good video! Just a quick question for you Bike Blogger, I've noticed that the last few times when using the Joe Blow pump that we both have that it will hiss or leak air while I'm pumping. I'm still able to reach maxium tire pressure but it leaks the whole time I am inflating. Has this ever happened with your pump and would you know why this happens and what to do about it? FYI it never did this before and it is still practically brand new. Thanks BB!
+trevorduvall I had the same issue once, trevorduvall. There should be a little cap on the side of the pump near the bottom. Make sure it is screwed on all the way. That fixed it for me.
If you run tubeless, the valve cores can get clogged or fouled by sealant. I replace cores from time to time. It’s a 2 minute job. But I have the tool.
Great video. Had this issue and didn't realised you could remove that part on a Presta (more familiar with schrader valves). You saved me buying a new tube.
the air would be entirely gone overnight while it's Ok even the bike is on the road for few hours, this has continued for few weeks. Wondering if it's due to presta valve or a hole in the tire, thanks if you have an answer to it.
Thanks for the great vid. I'm not crazy about the freakin presta valves - what a pain. I'm going to try to tighten mine and see if that's the problem with air coming out quickly after I unscrew the adapter after using an electric air pump.
I bent the presta valve core after incorrectly pumping tire. Tubeless tire. Just need to find out what presta valve is appropriate for my tubeless tire.
Can you get the valve core from a different tire and put it on another one??? I'm asking because my tire is missing the core so the air comes out... but I have a flat one nd I was wondering if I could take the inside of it nd put it on the other one??? Plz help.
Probably too late, but yes, obviously the air will come out of the tube immediately of their is no valve core, and , if the tube is not punctured,the valve core from a flat one should be fine--provided it wasn't leaking before you got a flat.
Thanks for this. The spoke tool also provides a good guage for how loose the core is, even I it is more than hand tight. In my case, I used the spoke tool to tighten the core and determined it was very loose. I was able to tighten it a bit more and hopefully solve a problem that I could not find the source of.
I think my Presta valve may be leaking. I am losing about half my pressure in 24 hours. How do I tell if my valve core is removable/replaceable? Do only the removable ones have flats on for pliers? Thanks for any help. 😘
I can't say for certain but Park Tool makes a specific tool VC-1 for removing valve cores that are on tight and it uses the flats to unscrew it. Since the tool relies on the flats to remove the valve core I think you can be fairly certain if it doesn't have flats it isn't removeable.
Let's hope the next time I get a flat and change the inner tube for one that unknowingly had a leaky valve I don't spend ages trying to find where on the 2nd tube it was punctured.
I think some valve cores cannot be removed. I have just tried to remove a GOOD one from a tube to be used to replace a bad one of another tube temporarily, and I broke the core. The tube is useless now.
@@mg1881 Yes i think Silicone would be better , i dont think the rubber will react to it like it does to most other lubricant. just make sure there no petrolium product in it :)
BARNTRIKEMAN Yeah, I have a little tool too that makes the job easier. I went back and check all my tires and the majority of the valves were loose. :\
+BikeBlogger I think they do that on purpose; just like knives are rarely sold fully sharp. You have to 'finish' it yourself. Things get damaged around warehouses so by leaving it 'loose' it is less likely to have that valve core rubber ring gasket go bad -- if it is fully tight it can and will wear out just via time. Trust me on that one. BTW the way around the cost issue is simply to remove the old core from any time you need to replace a flat tube. Stick it in a little drawer somewhere. (I save the rubber tube for other purposes much of the time) I just got my first bike with presta valves and need a new dual-purpose head to handle putting air in them from my compressor. My bike store doesn't sell them! Every place I have been only sells the silly hand pumps.Those presta adapters are a PITA and I see them littered all over the city wherever bikes are parked.
Check this one out. Today I had a flat. I patched it and road away. Maybe 2 miles up, I go flat again. I was done! I had just put a new tire on and I was pissed. I got a ride home. Took the tube out and could not find a hole. I finally just put the tube back in and pumped it up (I figured I wanted to stretch the new tire because it's new and tight on the rim). It's been about 7 hours and the tire is holding all the pressure???? I rode it around the block and all is fine. If I wake tomorrow and it still has the air - the only thing I can imagine, is someway the valve opened and let the air out??? It's habit for me to close the valve, but maybe I didn't? Even if I didn't, why would it let the air out like that? I"m lost. I hate the thought of going for a ride tomorrow and having to call for another ride. We'll see, I guess.
What I hate about those removable conti valves is, that they came loose far too often, unscrewing my Lezyne pump after inflating the tyre...forcing me to start all over...
This makes no sense. If the replacement valves cost the same as replacing the entire Tube what is the point of purchasing valves? I've been replacing my tubes each time I change my tires, which I do roughly every 10 months. It costs me a little more to use new tubes but I don't worry about a tube failure from wear and tear.
Sometimes the valve cores break. They are tiny, so it makes sense to always carry one or two around with you. It's annoying having to change a tube just because the value has broken, and if you don't have a spare tube you are screwed.. That said, it doesn't make any sense to buy the cores seperately, just remove them from old tubes that are torn or you've patched once too often..
If there is a problem on the seat of the valve core where the rubber o-ring seals against an outer lip (as usually seems to be the failure point), then Teflon tape would only help act like a threadlocker and not seal any air movement.
If you have a non removable leaky valve then yes, I think the easiest thing to do would be change the tube. Sometimes they come with manufacturer defects so it's good to give it a look over before installing.
THE SECURING VALVE NUT HAS BEEN INSTALLED UPSIDE DOWN ! THIS MEANS THE WHOLE VALVE WIGGLES ANS MOVES AND EVENTUALLY THE TUBE SPLITS AT THE SEAT OF THE VALVE.
I've had tires I've ridden for years with a Presta with no valve nut on... I could see riding it flat and aggressively causing problems tearing the stem off though.
To be absolutely sure you can check the tube by removing it from the bike, pump it up, and submerge it in water and look for bubbles indicating air escaping. It could be a tiny pin hole. ua-cam.com/video/N6Dya1DwRNM/v-deo.html
What about if you forgot to tighten the valve into the wheel before adding sealant? I've just fucking done it without thinking and now the wheel loses air slowly
It's not uncommon for a tube to ship with a loose core...any time I buy a tube I check the core tightness before I install the tube or stick it in my saddle bag.
Okay so who invented this Presta valve thing and why even is it a thing. the thing sucks ass so many problems I thought this was like some revolutionary type of thing at first
I have no idea who thought a presta valve would be a great invention!
Its so dumb....When it gets dirt in it it just brakes off....
the money making industry...
@@Movementdeluxe user error... That's what valve caps are for
Seems like a French or Italian idea to me...
My valve doesn't let air out when you press down, When you unscrew it to loosen it to put air in it then try to screw it back in it let's air out right when you touch it, Funny thing is the back tire is an old school valve with a center pin and it works fine
Presta valve - a solution we had no problem for
Thanks for the advice; this stops me from buying a new bicycle to fix the problem.
Thanks, BikeBlogger-- your video helped me understand why my presta valve was leaking--- didn't even KNOW there was a "core" that could become loose. Just tightening it did the trick. Thanks a bunch!
Thank you that solved my problem that I´ve been fighting with a lot. Now feeling pretty stupid not figuring it out by myself but main thing it´s now finally fixed!
Perfect, thank you! This will save me having to replace entire tubes every time one of my valve stems gets bent. I wish I had thought to google this years ago.
Good video. Before discarding an old damaged tube I always save the valve cores. Have a pill bottle full of them.
Thanks for saving me from needing to return the tube. As others have stated - what a stupid design. I've had so many problems with the Presta valves over time.
I've had presta valves for 20 years and changed bike and had 3 duff tubes so far all leak 2 continental with removable cores and one that came with the bike. I think I only replaces the tubes once on my last bike and I used to ride tons, now get a flat every 20miles which is absolutely ridiculous
Hi very good video I recently had got some continental tubes for my bike which is presta. I went out for a ride and thought what, tyre is flat not gone over anything these are brand new tubes. After walking home and next day taking cap off I discovered the valve had come out and stuck in the cap. Being new to presta I thought it must be a faulty innertube so complained to Amazon and they sent me out 2 replacements. Now knowing from this video that it was because the valve was completly loose, which caused the problem. It has given me knowledge and others who see this video who did not know. Thanks
thanks!! Was thinking I needed to replace the entire tube, which I literally just replaced; this vid saved me hours of time, and about 20$!
Incredible video….now I know exactly what to check for without automatically assuming that I need a new stem. Was puzzled why I couldn’t figure out how the stem was losing air.
Thanks brother, just went and bought a pump and a new inner tube to find out it was the valve the whole times so this video came in very handy ❤️👍🏾
I also have Continental tubes, I actually bought a bunch of them in bulks and I think that most of them have this issue of being not screwed strong enough because air escaping my tubes is a common problem. Thanks a lot for the clip! hope it helps, might update in a few months if it does.
Oren I have been having the same issue with Continental tubes. I was thinking that the batch I bought was defective? Have you had issues since correcting this problem? Much appreciated.
*Schrader valves on bike inner tubes only support a max PSI of 65 so that's why the Presta valve was invented. Yep, they're a pain to maintain, however thanks to the presta valve we can put 120 psi in bike road tires and roll faster.*
My mountain bike has no need to have a pressure greater than 65 psi. Just give me a Schrader valve.
Whoever believes that shrader holds less I'm sorry you live In The mechanically challenged world, Presa is a scam
@@wrxgereboost *Schrader valves on bike inner tubes hold a max psi of around 65 psi. Schrader valves in general hold a max psi of 15,000 psi, but on a bike tire you are mechanically challenged if you believe you can safely pump 120psi into a bike tire with Schrader valve.*
I'll agree to that lol, the actual shrader on a bike doesn't go higher, but like you said shrader in general do, just saying it would be better off to have a new version of shrader for a bike than ever use presta again
@@wrxgereboost *Yeah I personally resent the presta valve however I like to go fast on my Continental Contact Speed bike tires and they won't roll fast and easy without at least 100 psi in them so I tolerate the Presta.*
My tube had a slow leak. Cured it by screwing in the valve core tighter. I guess it loosened by my overdoing it when I loosened the sleeve to pump up the tube. I think the leak path is along the threads between the core and the stem.
TopTip - I have just removed my stem valve following puncture repair inspection revealed Soaps water suds at the tip. I wrapped a small amount of PTFE tape around the stem thread and replaced it. No more leakage 👍🏻
Just a got a used road bike with Presta valves and one tire had a slow leak I knew NOTHING about Presta valvesso you helped me out big time. I won't buy a new tube until I try your trick
Mine had no caps, should I buy some? Thank you again .
Exactly what I needed to see. Thank you !!
just a side note:
when I went to release the presta knob to add air, the knob sheared off from the long stem that goes down the core. It happen twice on both the front and rear tube. If this happens to you, you can order new presta cores to replace. Just make sure your tube allows for replacement because some don't. but remember that you have to remove the old long piece of stem that is still inside the tube or you can end up puncturing the tube from within. this is what I did to find it quickly.
1. add the new core to the tube.
2. add air to the tube like blowing into a balloon. close off the stem. you just need enough air to be able to hear the long piece of stem floating inside the tube.
3. listen for it as you shake the tube slowly. Remember you want to make sure the piece inside drops towards the stem.
4. once you hear it, locate it by softly pinching the tube until you feel it. make sure you hold on to it.
5. As you are holding it, remove the new stem core that you installed earlier.
6. Now, there should be no air since you removed the stem core.
7. kind of guide the stem core piece towards the stem hole and feed it into the stem.
8. once you know that it's inside, tilt the stem downward and watch it fall out.
if anyone has a better way to remove, then let us all know.
in the 30 years of cycling I can't recall that I have ever had a Presta knob shear off from the stem core. kind of weird or just cheap tubes. they are from Specialized. The tubes are still good other than the presta valve breaking off.
it took me no more than 5 minutes for the whole routine. If you would like a video, like my post and reply.
THIS was exactly what I needed! Thank you and a thumbs up!
Thank you for posting these videos I enjoy taking a lift on your commute as much as your tutorials.
There is another reason to remove and reinstall (the same) core -- sealants. Say you get a flat around 1h ride from home. You unscrew core, put some sealant into the tube, insert core back, inflate the tube, rotate the wheel, wait few minutes and you can get back home without entire procedure or removing entire wheel, changing tube, etc.
so, the sealent will defenitely not seal of the valve?
@@95Geli 1:36 OP states the ONLY reason you would like to remove the valve core is when it breaks which is not true, because there is pretty good reason for removing it -- putting sealant inside the tube in case of the puncture, as I described above.
you just saved me the price of an inner tube. I'm used to schrader so didn't know this!
Very helpful thanks . Had tire go flat couldn't figure out why . Now I know
Great, now we have to check two things to see where the leak is
OK I ran into this one this afternoon on the wife's bike and was unaware about the valve core possibility. But I removed the existing inner tube and inflated it outside of the wheel and it keeps pressure. Then I installed a brand new inner tube fresh out of the box and it does the same thing - on an inner tube that's brand new! Looking, the rim tape on the wheel looks intact/good and the wheel itself doesn't seem to have any sharp edges that would cause it - I've been using presta valves since the early 2000s and now I have two "bad" ones in one hour? One on a brand new inner tube? Tire looks hardly ridden as well.
I just messed up one of my presta valves using cheap Walmart bike pump. You live and you learn, I guess. Time to replace the valve core
So simple, i nearly chucked the tube but a little tightening fixed it. Thanks.
Thanks for your video. The presta valve broke off of my back tire. I picked up an inner valve core to replace it, but I can't get the original one to come out. It appears that the valve core and the stem are one piece. I can't unscrew it. Could this my problem? Are some made this way? Cuz if it is, I need to bring the bike into a shop. I'm not real bike tech savvy, but I try smaller fixes when necessary. Any advice would be greatly appreciated!
I can hear mine leaking. But I cannot get it to turn out. It seems the whole stem turns not just the core. There is nowhere to grab the stem to stop it from turning. Maybe I should use a cloth and some pliers. Should it be this hard?
After i inserted the pump head, this valve leaking when pumping in air. When i remove my pump, no leak again. Was it deal to the same problem? Valve loose? Thanks
So Simple, Did Not know about that, Thanks.
Easy enough. The presta valve may have been slightly bent but my pump pulled the whole thing out. Here's hoping I can just replace the core. The tube was new.
I overtightened the valve nut and the valve stem is now leaking a lot. Do you think this would require a new tube with valve?
Good video! Just a quick question for you Bike Blogger, I've noticed that the last few times when using the Joe Blow pump that we both have that it will hiss or leak air while I'm pumping. I'm still able to reach maxium tire pressure but it leaks the whole time I am inflating. Has this ever happened with your pump and would you know why this happens and what to do about it? FYI it never did this before and it is still practically brand new. Thanks BB!
+trevorduvall I had the same issue once, trevorduvall. There should be a little cap on the side of the pump near the bottom. Make sure it is screwed on all the way. That fixed it for me.
Respect now i know how to put puncture proof tire solution in to it
If you run tubeless, the valve cores can get clogged or fouled by sealant. I replace cores from time to time.
It’s a 2 minute job. But I have the tool.
Careful threading these!
These type of valve are meant to be used when you put sealant for tubeless tires.
Excelent... !! Tku..... Idea: stop the lake with silicón grase to...
I love you, man! Loose friggin valve core!
Great video. Had this issue and didn't realised you could remove that part on a Presta (more familiar with schrader valves). You saved me buying a new tube.
the air would be entirely gone overnight while it's Ok even the bike is on the road for few hours, this has continued for few weeks. Wondering if it's due to presta valve or a hole in the tire, thanks if you have an answer to it.
Mines leaking from the round wide part that is touching rim. What’s the fix for this? I keep turning it thinking it’s tightening but still leaks air
Thanks for the great vid. I'm not crazy about the freakin presta valves - what a pain.
I'm going to try to tighten mine and see if that's the problem with air coming out quickly after I unscrew the adapter after using an electric air pump.
I didn't that because I've thrown away 3 inner tubes. But I did question after the 3rd inner tube what was going on?
Thank you this was so so helpful!
Many thanks
Great video, thanks
I bent the presta valve core after incorrectly pumping tire. Tubeless tire. Just need to find out what presta valve is appropriate for my tubeless tire.
this just happened to me. what did you end up doing?
I will give that a try! Thanks!
Continental inner tube good quality and normally have same issue I just tight them up with spanner so simple when u know what ur doing
Thanks for sharing
Can you get the valve core from a different tire and put it on another one??? I'm asking because my tire is missing the core so the air comes out... but I have a flat one nd I was wondering if I could take the inside of it nd put it on the other one??? Plz help.
@@kithkin01: What a small, nasty insecure clown you are. Why not just answer her question, instead of abusing her for no reason?
Probably too late, but yes, obviously the air will come out of the tube immediately of their is no valve core, and , if the tube is not punctured,the valve core from a flat one should be fine--provided it wasn't leaking before you got a flat.
@@Jigaboo123456 I have a problem, I know. But with white knights like you around, I'm always sure to be put back in my place. Thank you courageous sir
That bottom security "screw" is that right way of that? Or you put it up side down I bought bike with that tyre and I am not sure
a spoke key makes a good tool if you have one the right size
Thanks for this. The spoke tool also provides a good guage for how loose the core is, even I it is more than hand tight. In my case, I used the spoke tool to tighten the core and determined it was very loose. I was able to tighten it a bit more and hopefully solve a problem that I could not find the source of.
Just Make sure the core is tight or get tube without removable cores if there available also I think the hold air a lot better JMO
Thanks for the video tips
Thanks , just what I neded to know !
ok so the top of mine that has the twisty thing broke off, can i put it back in?
I think my Presta valve may be leaking. I am losing about half my pressure in 24 hours. How do I tell if my valve core is removable/replaceable? Do only the removable ones have flats on for pliers?
Thanks for any help. 😘
I can't say for certain but Park Tool makes a specific tool VC-1 for removing valve cores that are on tight and it uses the flats to unscrew it. Since the tool relies on the flats to remove the valve core I think you can be fairly certain if it doesn't have flats it isn't removeable.
Hands up anyone watching in 2024!!
Thanks for posting. Useful to know.
Thanks, this was quite informative!
How do I fix a bent end?
Let's hope the next time I get a flat and change the inner tube for one that unknowingly had a leaky valve I don't spend ages trying to find where on the 2nd tube it was punctured.
I think some valve cores cannot be removed. I have just tried to remove a GOOD one from a tube to be used to replace a bad one of another tube temporarily, and I broke the core. The tube is useless now.
شكرا لك اخي الكريم
Cheaper tubes won't unscrew like that: they will break off.
thats bad... i had this issue today... tried a drop of oil inside core. my last try before buying new tube, it seems to be working though
petrolium based products usage on rubber material is ill advised mate.
@@42024247514 how about silicone grease on that little o-ring?
@@mg1881 Yes i think Silicone would be better , i dont think the rubber will react to it like it does to most other lubricant. just make sure there no petrolium product in it :)
Great video...that's exactly what my problem is (2nd time it's happened too). Now I know what I need to do :-).
Well how the heck do you fix it if it’s not removable? Could you please do a video on that?
Hi BikeBlogger. I have a little spanner that fits the valve.
BARNTRIKEMAN Yeah, I have a little tool too that makes the job easier. I went back and check all my tires and the majority of the valves were loose. :\
+BikeBlogger I think they do that on purpose; just like knives are rarely sold fully sharp. You have to 'finish' it yourself. Things get damaged around warehouses so by leaving it 'loose' it is less likely to have that valve core rubber ring gasket go bad -- if it is fully tight it can and will wear out just via time. Trust me on that one. BTW the way around the cost issue is simply to remove the old core from any time you need to replace a flat tube. Stick it in a little drawer somewhere. (I save the rubber tube for other purposes much of the time) I just got my first bike with presta valves and need a new dual-purpose head to handle putting air in them from my compressor. My bike store doesn't sell them! Every place I have been only sells the silly hand pumps.Those presta adapters are a PITA and I see them littered all over the city wherever bikes are parked.
Check this one out. Today I had a flat. I patched it and road away. Maybe 2 miles up, I go flat again. I was done! I had just put a new tire on and I was pissed. I got a ride home. Took the tube out and could not find a hole. I finally just put the tube back in and pumped it up (I figured I wanted to stretch the new tire because it's new and tight on the rim). It's been about 7 hours and the tire is holding all the pressure???? I rode it around the block and all is fine. If I wake tomorrow and it still has the air - the only thing I can imagine, is someway the valve opened and let the air out??? It's habit for me to close the valve, but maybe I didn't? Even if I didn't, why would it let the air out like that? I"m lost. I hate the thought of going for a ride tomorrow and having to call for another ride. We'll see, I guess.
two wheeled soto:
I'm having the same problem. Did youy ever find out the answer?
What I hate about those removable conti valves is, that they came loose far too often, unscrewing my Lezyne pump after inflating the tyre...forcing me to start all over...
Thanks! Problem solved.
This makes no sense. If the replacement valves cost the same as replacing the entire Tube what is the point of purchasing valves? I've been replacing my tubes each time I change my tires, which I do roughly every 10 months. It costs me a little more to use new tubes but I don't worry about a tube failure from wear and tear.
Sometimes the valve cores break. They are tiny, so it makes sense to always carry one or two around with you. It's annoying having to change a tube just because the value has broken, and if you don't have a spare tube you are screwed.. That said, it doesn't make any sense to buy the cores seperately, just remove them from old tubes that are torn or you've patched once too often..
I agree with sisiophus
Valve cores are wayyyy (think around 1/10th the price) cheaper than a tube if you buy the cores intelligently.
I'd rather buy a new tube for 8$ that will actually work.
both tires with Presta valves will NOT unscrew as shown on this video (from a Continental CityRIDE)
Not all presta valves will unscrew. Most cheaper inner tubes don't have removable valve cores.
I think it is moraly right to steal your friend's stem valve core. just saying
Swap them
You could just use teflon tape. You wrap it around the threads and just screw the valve in. You don't have to overtighten the screw then.
If there is a problem on the seat of the valve core where the rubber o-ring seals against an outer lip (as usually seems to be the failure point), then Teflon tape would only help act like a threadlocker and not seal any air movement.
I haven’t ridden in a few days and last night my valve randomly exploded out of nowhere and leaked all the air out and won’t inflate again
Should you just buy a new intertube??
If you have a non removable leaky valve then yes, I think the easiest thing to do would be change the tube. Sometimes they come with manufacturer defects so it's good to give it a look over before installing.
@@BikeBlogger i have bought several new tubes, and it still goes down - when riding.
THE SECURING VALVE NUT HAS BEEN INSTALLED UPSIDE DOWN ! THIS MEANS THE WHOLE VALVE WIGGLES ANS MOVES AND EVENTUALLY THE TUBE SPLITS AT THE SEAT OF THE VALVE.
I've had tires I've ridden for years with a Presta with no valve nut on... I could see riding it flat and aggressively causing problems tearing the stem off though.
Before you do anything just put the valve in some water and if it bubbles you know the leak is coming from the valve.
tightening It didn't fixe it for me,
hope it turns out to be just that , saves a few dollars ...
Thanks, process of elimination.
So, to clarify, if it's not the valve core it's the inner tube.
To be absolutely sure you can check the tube by removing it from the bike, pump it up, and submerge it in water and look for bubbles indicating air escaping. It could be a tiny pin hole. ua-cam.com/video/N6Dya1DwRNM/v-deo.html
@@BikeBlogger you may also use soap foam directly on valve on tube under pressure
This MUST be whats wrong with minw, but it keeps happening, only when riding the bike, otherwise it stays up
Why are presta valves even a thing when we already have schrader? Presta just seems more leak-prone, fragile and unnecessarily complex.
My valve was wonky, I literally hit it with a hammer and it seems to have stopped leaking now!
You hit it in?
Journeyman mechanic.
Of course, no force. Just get a bigger hammer.
Sounds about right with this type of valves haha
What about if you forgot to tighten the valve into the wheel before adding sealant? I've just fucking done it without thinking and now the wheel loses air slowly
Thanks for showing, but god please EU, forbid this valve and ban it from the market.
It's not uncommon for a tube to ship with a loose core...any time I buy a tube I check the core tightness before I install the tube or stick it in my saddle bag.
A valve core removal tool makes it a lot easier fyi
I always have trouble with theses valves for years now hate them
They always leak. Leave bike alone a week and have to reinflate again
Okay so who invented this Presta valve thing and why even is it a thing. the thing sucks ass so many problems I thought this was like some revolutionary type of thing at first
I never knew
Some of these poorly designed valves come fully made with no integral parts. Schrader valves every time.
Bad design... hufff
Never had an issue like this with the old kind.. I'm just sayin
@@JJPhilosophy a nigthmare to me..