Help with valves

HarrisonLennon

Hey guys n gals,

I could actualy chew my inner tube in two. I'm desperately trying to keep motivated to use my bicycle. I love it, it's healthy. And free to ride. Unless you an idiot like me.

Who everytime try's to put air in my tyres pulls the valve out of the presta which stays attached to my crappy pump. And can't fit it back in.

It kills me. So I go and buy a whole new inner tube.

I'm sick of the presta, and want to go for an old fashioned schrader.

So can I just buy an inner tube for my wheel with a schrader valve. It's a slime wheel. More racer then mountain bike. It has 28 x 1 1/4 x 1 3/4 on the tyre.

DirkVoodoo

This doesn't sound like the fault of the Presta.

I'd suggest going to a shop/friend/youtube and seeing how it's done, countless people use Presta everyday without any bother.

HarrisonLennon

DirkVoodoo wrote: »

This doesn't sound like the fault of the Presta.

I'd suggest going to a shop/friend/youtube and seeing how it's done, countless people use Presta everyday without any bother.

Oh no no, you must have misunderstood me. I'm an complete muppet. And its hardly the fault of a world famous valve. I just want to know if I can change to schradar inner tube. Clearly I'm a novice.

Cork24

are you unscrewing the valve to lose..

if the valvegets stuck inside your pump you can screw it back into the tube...

HarrisonLennon

Cork24 wrote: »

are you unscrewing the valve to lose..

if the valvegets stuck inside your pump you can screw it back into the tube...

Yup, that's generally the problem. When I screw off the pump. It pulls the valve out. And for some reason won't sit right for me again. I'm be much happier with a schradar.

So..

LeftBlank

HarrisonLennon wrote: »

Yup, that's generally the problem. When I screw off the pump. It pulls the valve out. And for some reason won't sit right for me again. I'm be much happier with a schradar.

So..

If the valve hole is big enough to accomoate schrader, then there's no reason why it should not work.

OTOH, I have never heard of a presta pump that needs to be screwed in, only ones that you push in and pull out.

quozl

I'm also a novice and wouldn't have a clue myself but I know a man who might -
http://sheldonbrown.com/flats.html

A Schrader valve won't fit through the valve hole on a rim drilled for Prestas.

Schrader valves are wider so they won't fit. If the wheel is wide enough you could possibly drill it out - I've seen that mentioned somewhere as a possibility - but IMO you'd want to be an expert to have any idea if you can trust the wheel after that. Me and you would be insane to do it, I think.

Is it possibly your pump at fault? I'm also a novice and I've found my limited exposure to Prestas fine so far - after find a youtube video explaining how they work! I didn't know it was possible for the valve to come off, so thanks for letting me know to watch out for that myself!

HarrisonLennon

LeftBlank wrote: »

If the valve hole is big enough to accomoate schrader, then there's no reason why it should not work.

OTOH, I have never heard of a presta pump that needs to be screwed in, only ones that you push in and pull out.

It's a multi pump. Can be presta or schradar. Stupid really. And I know I'm failing. Just have bad luck.

But yeah thanks. If that's what it comes down too. Just fitting through the whole in my wheel. Happy days. You've answered my question.

jimm

There are little "flat spots" on the threads of Presta valves where the outer part screws into the inner core. Always make sure this connection is tight with a pliers before using. Found this out the hard way, like yourself.

HarrisonLennon

quozl wrote: »

I'm also a novice and wouldn't have a clue myself but I know a man who might -
http://sheldonbrown.com/flats.html



Schrader valves are wider so they won't fit. If the wheel is wide enough you could possibly drill it out - I've seen that mentioned somewhere as a possibility - but IMO you'd want to be an expert to have any idea if you can trust the wheel after that. Me and you would be insane to do it, I think.

Is it possibly your pump at fault? I'm also a novice and I've found my limited exposure to Prestas fine so far - after find a youtube video explaining how they work! I didn't know it was possible for the valve to come off, so thanks for letting me know to watch out for that myself!

Ah I see. I'll check out that page and just have to try and try. I want aware you could actually manage to put the valve back in successfully if it popped out. I tried but wouldn't work.

HarrisonLennon

jimm wrote: »

There are little "flat spots" on the threads of Presta valves where the outer part screws into the inner core. Always make sure this connection is tight with a pliers before using. Found this out the hard way, like yourself.

Will do. Thanks pal

quozl

Here's some details on how to do the conversion - http://sheldonbrown.com/gloss_p.html#presta

If you want to convert a rim drilled for Presta valves to accept Schrader valves, drill it out with a 21/64" drill bit.

I don't think that would work wonderfully on very narrow rims, so YMMV

Brian?

Does this video help at all?

http://www.youtube.com/watch?v=JJFfH3kT7tc


Have you a picture of the pump you're using?

Big Eejit

Bloody hell! I read through a page of gibberish only to find out that the OP's core needed tightening? BOOOOOO!

No Pants

Before you fit the tube, unscrew the inner valve, add some Loctite and screw it back in. That's what I do.

I thought that only some Presta valves had a removable component, not all.

ednwireland

i have a lezyne pump which screws onto the valve, i had some vittoria tubes which have brass shafts and steel valves (guess what happens pump up gets hot, the guys at vittoria never heard of things expanding at different rates) similar problem with schwalbe tubes. pretty much used continental tubes since then and had very little problem.

as said before if the hole is big enough schrader will be fine, the reason presta is used on racing rims is narrower rims presta needs smaller holes

Wishbone Ash

Is your pump a small hand pump/mini pump or a floor/track pump?

HarrisonLennon wrote: »

. I just want to know if I can change to schradar inner tube

HarrisonLennon wrote: »

I'm be much happier with a schradar

I'm open to correction but I don't think you'll get a road bike tube with a Schrader valve. I've never seen one.

LeftBlank wrote: »

I have never heard of a presta pump that needs to be screwed in, only ones that you push in and pull out.

My Lezyne mini pump has a connection which screws in.

HarrisonLennon wrote: »

It's a multi pump. Can be presta or schradar. Stupid really

That's standard practice and hardly stupid. In fact, it's very convenient for anyone with several different bikes.

cdaly_

Wishbone Ash wrote: »

I'm open to correction but I don't think you'll get a road bike tube with a Schrader valve. I've never seen one.

When you say 'road bike tube' do you mean 700c or skinny? My wife's hybrid runs 700c x 32 tyres with schrader valves and I recall using schrader valves on my old 27" x 1 1/4" road bike tubes.

Wishbone Ash

cdaly_ wrote: »

When you say 'road bike tube' do you mean 700c or skinny? My wife's hybrid runs 700c x 32 tyres with schrader valves and I recall using schrader valves on my old 27" x 1 1/4" road bike tubes.

Yea, I should have clarified that I was referring to 700/23, 700/25 etc.

doozerie

Most, and perhaps all, Lezyne pumps use a threaded attachment to valves. I've read quite a few reports of people finding that the presto valve core unthreaded when unscrewing the Lezyne hose from it after pumping up a tyre, and it has happened to me too on occasion. Lezyne introduced a new version of their hose, over a year ago now I think, labelled "V2", which has a small little rubber button/valve on it to allow you to release air from the hose before unscrewing it from the presta valve. Breaking the airtight seal is supposed to make the presto valve core less likely to unthread. It seems to work.

If you are using a Lezyne pump then you can either buy a "V2" adaptor for a track pump (just a small cylinder with the release valve built into it, which threads onto the end of your existing track hose), or you can buy a replacement "V2" hose for hand-held pumps which you use instead of the older hose. Alternatively, for hand-held pumps you can just unscrew the hose from the pump end first and this will break the airlock before unscrewing the hose from the presto valve.

If you have a non-Lezyne threaded pump where the hose can't be detached from the pump end then some of the options already mentioned, of tightening the valve cores (there is a small little tool available to do just this, or just carefully use a pliers) or buying tubes without removable cores, are the best bets.

LeftBlank

Wishbone Ash wrote: »

Yea, I should have clarified that I was referring to 700/23, 700/25 etc.

http://www.chainreactioncycles.com/Models.aspx?ModelID=26727