presta valve stems bending

wle said:

what makes presta valve stems bend over?

almost all mine get bent somehow.

not sure if it is floor pump or the frame pump that does it.

It will be to do with one of those pumps (I don't know which particular heads you've got). You're
probably being too rough with the frame pump.

In future, try unscrewing the little presta nut by the minimum amount that's needed to work and try
and keep everything aligned well without pushing/pulling sideways too much.

They are possible to bend back to some extent but don't bend more than once whatever happens.

~PB

wle said:

what makes presta valve stems bend over?

almost all mine get bent somehow.

To remove a frame pump from a Presta valve, you should give the pump barrel a sharp rap with your
hand so it is knocked off the valve. Never "wiggle" it off.

Quoted message said:

In future, try unscrewing the little presta nut by the minimum amount that's needed to work and
try and keep everything aligned well without pushing/pulling sideways too much.

good idea.

wle.

anonymous said:

What makes Presta valve stems bend over? Almost all mine get bent somehow. Not sure if it is floor
pump or the frame pump that does
it. or - well this can't be it - the tire caps.

Presta valve stems don't bend, they break off. You must be having some other problem.

Quoted message said:

They get so bent that it is hard to screw them back closed because the screwer thingy rubs the
valve body.

You must mean the valve nut. That gets bent by using a bad pump chuck and removing it by bending
it from side-to-side. Pull the pump chuck straight off. For a hose pump, this ought to be obvious,
for a frame fit pump with attached valve chuck this is done by pushing the pump off with the palm
of the hand.

How about observing when the valve nut becomes bent after each inflation. That ought to be an easy
method of finding the answer to your first question.

Jobst Brandt [email hidden]

Quoted message said:

You must mean the valve nut. That gets bent by using a bad pump chuck and removing it by bending
it from side-to-side.

It seems strange to call the part on which the small knurled captive nut turns a "nut". That is the
part that gets bent.

~PB

Quoted message said:

anonymous said:

What makes Presta valve stems bend over? Almost all mine get bent somehow. Not sure if it is
floor pump or the frame pump that does
it. or - well this can't be it - the tire caps.

Presta valve stems don't bend, they break off. You must be having some other problem.

How about "valve core stem" or just "valve core"?

~PB

John Dacey said:

Main Entry: valve <fluff snipped, caps below added for emphasis> 3 a : any of numerous mechanical
devices by which the flow of liquid, gas, or loose material in bulk may be started, stopped, or
regulated by a movable part that opens, shuts, or partially obstructs one or more ports or
passageways; also : THE MOVABLE PART OF SUCH A DEVICE

From which we see that the word "valve" is ambiguous. It would be nice to have a word for this part
that wasn't.

--
Benjamin Lewis

Seeing is deceiving. It's eating that's believing.
-- James Thurber

Pete Biggs said:

Quoted message said:

Quoted message said:

What makes Presta valve stems bend over? Almost all mine get bent somehow. Not sure if it is
floor pump or the frame pump that does
it. or - well this can't be it - the tire caps.

Quoted message said:

Quoted message said:

Presta valve stems don't bend, they break off. You must be having some other problem.

Quoted message said:

Quoted message said:

You must mean the valve nut. That gets bent by using a bad pump chuck and removing it by bending
it from side-to-side.

Quoted message said:

It seems strange to call the part on which the small knurled captive nut turns a "nut". That is
the part that gets bent.

Quoted message said:

How about "valve core stem" or just "valve core"?

That doesn't work either because Presta valves have removable cores, similar to Schrader
valves. These can be detected by two flat sides on the valve cap thread, the means by which the
core is removed.

How about threaded valve shaft and nut?

Jobst Brandt [email hidden]

"Pete Biggs" <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

Quoted message said:

anonymous said:

What makes Presta valve stems bend over? Almost all mine get bent somehow. Not sure if it is
floor pump or the frame pump that does
it. or - well this can't be it - the tire caps.

Presta valve stems don't bend, they break off. You must be having some other problem.

How about "valve core stem" or just "valve core"?

~PB

Dear Pete,

Seems reasonable, although I rather liked the original poster's "the screwer thingy" phrase.

Sometimes I bend my screwer-thingy valve core stem, but it usually bends back with a deft flick
of my immensely powerful blacksmith-like fingers as I fix another flat under the spreading
chestnut tree.

Well, my fingers and a pair of needlenose pliers.

Henry Wadsworth Longfellow

On Mon, 24 Nov 2003, [email hidden] (The Face That Lunched A Thousand

Cranks) said:

Pete Biggs said:

How about "valve core stem" or just "valve core"?

That doesn't work either because Presta valves have removable cores, similar to Schrader
valves. These can be detected by two flat sides on the valve cap thread, the means by which the
core is removed.

How about threaded valve shaft and nut?

Jobst Brandt

Stop talking Pidgin Bicyclese!!! The thing you call a valve shaft is a _valve_ by definition. Adding
unnecessary gilding to the word "valve" can only be for the purpose of sounding self-important, just
like those folks you've previously branded as illiterati for trying to foist "crankarm", "wheelset"
and similar redundancies on an unsuspecting rbr readership teetering on the cusp of analphabetism.
Check it out in the online Webster's Dictionary:

Main Entry: valve <fluff snipped, caps below added for emphasis> 3 a : any of numerous mechanical
devices by which the flow of liquid, gas, or loose material in bulk may be started, stopped, or
regulated by a movable part that opens, shuts, or partially obstructs one or more ports or
passageways; also : THE MOVABLE PART OF SUCH A DEVICE

Welcome to the ranks of the Great Unwashed, Jobst. Benighted and sometimes guilty of "driving
the intelligence level of bike talk down at an accelerated rate", we're nonetheless great fun
at parties.

-------------------------------
John Dacey Business Cycles, Miami, Florida businesscycles.combusinesscycles.comOpen ↗ Now in our twenty-first
year. Our catalog of track equipment: eighth year online
-------------------------------

Quoted message said:

Quoted message said:

Quoted message said:

anonymous writes:
>What makes Presta valve stems bend over? Almost all mine get bent somehow. Not sure if it is
>floor pump or the frame pump that does
>it. or - well this can't be it - the tire caps.

Quoted message said:

Quoted message said:

Quoted message said:

Presta valve stems don't bend, they break off. You must be having some other problem.

Quoted message said:

"Pete Biggs" <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

How about "valve core stem" or just "valve core"?

Carl Fogel said:

Seems reasonable, although I rather liked the original poster's "the screwer thingy" phrase.

Well, that has. . . warmth.

We call the center vertical component of a Schrader valve a "pin" Any reason the Presta one can't be
a 'presta valve pin'? I think if the OP said, "Not knowing how to use my pump, I bent the presta
valve pin", we should know what he meant better than the original "stem", right?

--
Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971

Quod licet Iovi, non licet bovi. On Sun, 23 Nov 2003 23:15:42 -0800, Benjamin Lewis

Quoted message said:

John Dacey said:

Main Entry: valve <fluff snipped, caps below added for emphasis> 3 a : any of numerous mechanical
devices by which the flow of liquid, gas, or loose material in bulk may be started, stopped, or
regulated by a movable part that opens, shuts, or partially obstructs one or more ports or
passageways; also : THE MOVABLE PART OF SUCH A DEVICE

From which we see that the word "valve" is ambiguous. It would be nice to have a word for this part
that wasn't.

Except that in the past, others who have tried to use words that resolve ambiguities and enhance
meaning have sometimes been clubbed down here with a vigor normally reserved for fur seal pups.

In any case, Mr Brandt's "threaded valve shaft" fails to bring clarity because there are many valve
stems whose _externals_ are also threaded for their full length.

Isn't the moving part of a bike tube's valve its "piston"? (e.g., "I bent the threaded end of the
valve's piston."😉. Andrew M's "pin" is probably best though.
-------------------------------
John Dacey Business Cycles, Miami, Florida Now in our twenty-first year. Our catalog of track
equipment: eighth year online. businesscycles.combusinesscycles.comOpen ↗

A Muzi <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

Quoted message said:

Quoted message said:

>anonymous writes:
>>What makes Presta valve stems bend over? Almost all mine get bent somehow. Not sure if it is
>>floor pump or the frame pump that does
>>it. or - well this can't be it - the tire caps.

Quoted message said:

Quoted message said:

>Presta valve stems don't bend, they break off. You must be having some other problem.

"Pete Biggs" <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

Quoted message said:

How about "valve core stem" or just "valve core"?

Carl Fogel said:

Seems reasonable, although I rather liked the original poster's "the screwer thingy" phrase.

Well, that has. . . warmth.

We call the center vertical component of a Schrader valve a "pin" Any reason the Presta one can't
be a 'presta valve pin'? I think if the OP said, "Not knowing how to use my pump, I bent the
presta valve pin", we should know what he meant better than the original "stem", right?

Dear Andrew,

"Valve pin" it is--as long as I get to call it the "valve pin thingy" under stress and wave my hands
wildly at the frightened local bike shop employees.

You know! Like this! Sort of!

Carl Fogel