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Presta tube not inflating!

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Presta tube not inflating!

Old 12-12-12, 07:08 AM
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crinx83
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Presta tube not inflating!

Sorry, i should have posted the topic here, but this forum area isnt well named (should be "help / support" if its the help section!)

https://www.bikeforums.net/showthread...topped-working!

Am posting it here because this area seems busier and i need some help asap!
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Old 12-12-12, 07:19 AM
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jimc101
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Have you got the correct pump / pump head correctly set up, pumps come in different versions, some Schrader only, some presta only , some both, where the head need to be undone, and re-assembled to fit the appropriate valve, and come which auto select the valve type. Are you using the correct one?

Check out the Park Tools guide to how here https://www.parktool.com/blog/repair-...nd-installaton

For the forum to post in, look at the posts in the general forum, it's not about fixing bikes in there, more like what color should I paint the frame, of what saddle to get next; Bicycle Mechanics is pretty self explanatory as a name, and for what questions are going to be asked in it.
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Old 12-12-12, 09:41 AM
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Did you back off the nut and burp the valve?

Presta valves are simple check valves without springs, and designed to open by air pressure alone as you pump, and close immediately to keep the air in. Based on that most pumps don't have a valve depresser the way Schrader pumps do.

That said, modern valves tend to stick when they've been closed for a few days or more. So it's necessary to unstick them by burping. Back the nut off all the way and press the valve in for a second to break the seal, then you can pump normally. When burping you want to let the least amount of air out as possible since you'll be working to replace it, so the easiest way is a quick tap with the pump head.
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Old 12-12-12, 09:49 AM
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due ruote 
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[Pardon the double post; I put this response on your other thread as well.]

Seriously, I don't mean to pile on, but you clearly are doing something wrong and probably multiple things. It's not the bike's fault, and getting a different one won't help.

A screwdriver shouldn't be anywhere near your wheel; you're just asking for trouble. Also, you needn't buy those tubes with slime in them. Regular ones work fine.

Put one side of the tire on the rim. Put the valve in the valve hole on the rim, then fit the tube into the tire. Push up gently on the valve so that part of the tube is in the tire. Now you need to seat the second tire bead on the rim. I've read conflicting advice on this, but I like to start at the valve area. Get that part of the bead seated, taking care to keep the valve stem straight, ie. it should point at the hub. Then work your way around the rim in both directions, using nothing other than your hands to push the bead into the rim. I hold the wheel in front of me with the bead I'm seating facing me, and push it into the rim with my thumbs. You need to be extra careful here to avoid pinching the tube between the tire and rim! Keep pushing the tube in if it tries to slip out, which it will. When you approach the side of the rim opposite the valve, it will obviously become more difficult to fit the tire. Go back to the valve and pinch the sides of the tire together so the beads are as close as possible to the center of the rim. Do this all the way around the tire. Then go back and use those thumbs to finish the last bit.

As for the inflation problem, unscrew the valve core, then press in on the core. Also, you need to push the pump head firmly onto the valve stem. Put your thumb on the tire to support it and shove it on there so you have a good seal.
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Old 12-12-12, 10:13 AM
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jyl
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You should bring the wheel to a bike shop, pay them for a tube change, and have them show you how it is done. Bring your pump and have them show you how to use it to inflate the tire. You should leave with a couple of regular tubes of the correct size and not slime-filled, a tube repair kit, and a pair of tire levers. Those should cost around $10.

The reason I suggest you go get help from a bike shop is that you have been hacking at your bike, using a phillips screwdriver to force the tire on, puncturing the tubes in multiple places, getting slime everywhere, and breaking off Presta valves. I think you don't have enough experience doing mechanical things and using tools to efficiently learn how to do this on your own with just "internet advice". Maybe you can eventually figure it out, but only after a lot more frustration, ruining more tubes, possibly bending your rim, and maybe even injuring yourself.

There is a point when actual hands-on help is needed, and you are there.
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Old 12-12-12, 10:38 AM
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Also, in your original post, you said the tires had slowly gone flat. If they went flat over night, that would suggest a puncture. If they are just losing air over the course of a week or two, that is quite normal. And I agree with getting some hands-on instruction. Or at least finding a Youtube video and getting the proper equipment (tire levers).
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Old 12-12-12, 10:42 AM
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My pump has a head that will work wth presta or schrader. I find i have to be very careful and precise with presta valves to make sure the valve is inserted in the head correctly in order to get the valve to take air.
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Old 12-12-12, 10:45 AM
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drill out the hole and replace with a schrader tube. endo, finito, splitto down the road-o. life is too short to be fussing with acient technology. join the 21st century and ride your bike. sorry for my rant to you Frenchie lovers

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