A Cycling & bikes forum. CycleBanter.com

Go Back   Home » CycleBanter.com forum » rec.bicycles » Techniques
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Valve Exender Question



 
 
Thread Tools Display Modes
  #1  
Old November 22nd 05, 05:27 AM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question

Howdy folks. I've got a pair of Spinergy Rev-X tubular wheels that require
a valve extender for my Tufo tires. As those who use valve extenders know,
you have to leave the valve open before you attach the extender to the
valve. But for me, this results in a loss of pressure in the rear tire.
Have any of you ever dealt with this? If so, how did/do you solve this
problem.

Thanks in advance for your help.

Regards,

Philip


Ads
  #2  
Old November 22nd 05, 05:45 AM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question

I think the tire or it's valve is defective, or perhaps there is dirt
or somethign holding the valve open -- that doesn't happen to me. And
the fact that it only happens with your rear wheel suggests the same
thing.

JT


Thanks for the response. I'm not sure what you mean. I thought you have to
leave the valve wide-open before you attach the extender, else you can't
pump up the tire once it's on the rim.


  #3  
Old November 22nd 05, 05:46 AM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question

On Tue, 22 Nov 2005 04:27:09 GMT, "Philip W. Moore, Jr."
wrote:

Howdy folks. I've got a pair of Spinergy Rev-X tubular wheels that require
a valve extender for my Tufo tires. As those who use valve extenders know,
you have to leave the valve open before you attach the extender to the
valve. But for me, this results in a loss of pressure in the rear tire.


I think the tire or it's valve is defective, or perhaps there is dirt
or somethign holding the valve open -- that doesn't happen to me. And
the fact that it only happens with your rear wheel suggests the same
thing.

JT

****************************
Remove "remove" to reply
Visit http://www.jt10000.com
****************************
  #4  
Old November 22nd 05, 06:02 AM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question

On Tue, 22 Nov 2005 04:45:21 GMT, "Philip W. Moore, Jr."
wrote:

I think the tire or it's valve is defective, or perhaps there is dirt
or somethign holding the valve open -- that doesn't happen to me. And
the fact that it only happens with your rear wheel suggests the same
thing.


Thanks for the response. I'm not sure what you mean. I thought you have to
leave the valve wide-open before you attach the extender, else you can't
pump up the tire once it's on the rim.


Sorry, by "holding valve open" I meant something preventing it from
being closed by air pressure from inside the tube, even though it's
unscrewed.

Yes you have to leave it wide completely unscrewed, but it shouldn't
leak air -- the pressue in the tire will keep the valve sealed
(closed, even though it's screwed open) and it shouldn't lose air any
faster than if screwed shut. If it does, there is a problem with that
particular valve.

JT


****************************
Remove "remove" to reply
Visit http://www.jt10000.com
****************************
  #5  
Old November 22nd 05, 06:08 AM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question


"Philip W. Moore, Jr." wrote in message
et...
I think the tire or it's valve is defective, or perhaps there is dirt
or somethign holding the valve open -- that doesn't happen to me. And
the fact that it only happens with your rear wheel suggests the same
thing.

JT


Thanks for the response. I'm not sure what you mean. I thought you have
to
leave the valve wide-open before you attach the extender, else you can't
pump up the tire once it's on the rim.



Air shouldn't leak out of the valve even when it's "open" because air
pressure in the tube pushes the core out and seals it. If you are losing
pressure in this one tire, there is a problem in the valve that is not
simply the result of it being in the "open" position, or in the tube.

Used to use Rev-X wheels myself and did not have leakage problems with valve
extenders.

Cal


  #6  
Old November 22nd 05, 08:30 AM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question

Philip W. Moore, Jr. wrote:
Howdy folks. I've got a pair of Spinergy Rev-X tubular wheels that
require a valve extender for my Tufo tires. As those who use valve
extenders know, you have to leave the valve open before you attach
the extender to the valve. But for me, this results in a loss of
pressure in the rear tire. Have any of you ever dealt with this? If
so, how did/do you solve this problem.


As others said, it must be that particular tire/valve. (The front uses an
extender, too? And it doesn't leak?)

Could you use the extender to pump up to full pressure -- then remove it and
close the valve -- and then replace the extender on the /closed/ valve?
You'd just have to re-assemble the arrangement to add air...

Clincher Bill


  #7  
Old November 22nd 05, 01:55 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question

On Tue, 22 Nov 2005 07:30:01 GMT, "Bill Sornson"
wrote:
Could you use the extender to pump up to full pressure -- then remove it and
close the valve -- and then replace the extender on the /closed/ valve?


Not practical on a deep tubular rim.

JT

****************************
Remove "remove" to reply
Visit http://www.jt10000.com
****************************
  #8  
Old November 22nd 05, 02:52 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question

its very easy to check
pump it up to pressure, check the extender tip if air is coming out
(wet finders with soap and seal the opening) if no air is coming out
then there is still a slight possibility of air escaping from the joint
(but very unlikely).

In that case your tire may have a puncture. How fast is air leaking
?????

If the air was coming from valve you may have bent the screw valve or
the rubber ring inside is bad or something is preventing it from
closing all the way. remove the tire and check. Dont throw the tufos
away you can fix the valve if the core is removable. after repair a a
tad of grease to the valve before you add the extender and use a pair
of pliers to tigthen them dont crush it).

  #9  
Old November 22nd 05, 03:36 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question


Philip W. Moore, Jr. wrote:
Howdy folks. I've got a pair of Spinergy Rev-X tubular wheels that require
a valve extender for my Tufo tires. As those who use valve extenders know,
you have to leave the valve open before you attach the extender to the
valve. But for me, this results in a loss of pressure in the rear tire.
Have any of you ever dealt with this? If so, how did/do you solve this
problem.


Clinchers, long valve stem. --D-y

  #10  
Old November 23rd 05, 03:40 AM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Valve Exender Question

Philip W. Moore, Jr. wrote:
Howdy folks. I've got a pair of Spinergy Rev-X tubular wheels that require
a valve extender for my Tufo tires. As those who use valve extenders know,
you have to leave the valve open before you attach the extender to the
valve.


My Tufos have removable cores, so I bought Tufo extenders: they allow
the valve to be reinstalled at the accessible end of the extender.

But for me, this results in a loss of pressure in the rear tire.
Have any of you ever dealt with this? If so, how did/do you solve this
problem.


I use teflon plumber's tape on the threaded joints.

It's also possible your valve stem is slightly bent; I've known that to
make the valve's locknut press against the inside of the extender. That
prevents the valve from seating and so air gets out. To fix this I've
either carefully straightened the valve stem, installed it at the
accessible end of the extender or replaced the valve.

 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Good morning or good evening depending upon your location. I want to ask you the most important question of your life. Your joy or sorrow for all eternity depends upon your answer. The question is: Are you saved? It is not a question of how good Maggie General 0 April 22nd 05 12:27 PM
Good morning or good evening depending upon your location. I want to ask you the most important question of your life. Your joy or sorrow for all eternity depends upon your answer. The question is: Are you saved? It is not a question of how good Dan Techniques 0 April 22nd 05 03:48 AM
valve and pressure question Mark Shaw General 6 April 11th 05 02:13 AM
Noob Question: Valve Stem Lock Nuts xkred27 General 8 March 14th 04 03:49 PM
Tyre suddenly leaks air at valve. HELP! gkmac Unicycling 5 December 16th 03 11:20 PM


All times are GMT +1. The time now is 07:47 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright 2004-2022 CycleBanter.com.
The comments are property of their posters.