Go Back  Bike Forums > Bike Forums > General Cycling Discussion
Reload this Page >

Tube not inflating - issue with valve?

Notices
General Cycling Discussion Have a cycling related question or comment that doesn't fit in one of the other specialty forums? Drop on in and post in here! When possible, please select the forum above that most fits your post!

Tube not inflating - issue with valve?

Old 08-11-20, 07:15 PM
  #1  
jawchops
Junior Member
Thread Starter
 
Join Date: Apr 2020
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Tube not inflating - issue with valve?

Hi folks: I installed a new tube in my road bike's rear tire, but I cannot inflate the new tube. It's a presta valve. I unscrew the nut at the top of the valve, but cannot seat the pump on the valve. Also, when I push on the nut, there's no telltale "psssht". So, I don't know if there's something wrong with the valve, or it's user error. Any tips would be greatly appreciated!
jawchops is offline  
Old 08-11-20, 08:31 PM
  #2  
woodcraft
Senior Member
 
woodcraft's Avatar
 
Join Date: Apr 2012
Location: Nor Cal
Posts: 5,277
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1482 Post(s)
Likes: 0
Liked 519 Times in 307 Posts
One possibility is that the tube was damaged while putting things together, & it won't inflate because there's a hole in it.
woodcraft is offline  
Old 08-11-20, 10:07 PM
  #3  
AdkMtnMonster
Airplanes, bikes, beer.
 
Join Date: Jan 2020
Location: Off the front
Posts: 325

Bikes: Canyon Endurace CF SL 8.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 172 Post(s)
Liked 362 Times in 143 Posts
Does the pump have a pressure gauge? What does it read during each compression stroke? Do you hear any air moving whilst pumping?
AdkMtnMonster is offline  
Old 08-11-20, 10:56 PM
  #4  
dabac
Senior Member
 
Join Date: Mar 2008
Posts: 8,219
Mentioned: 43 Post(s)
Tagged: 0 Thread(s)
Quoted: 928 Post(s)
Liked 94 Times in 72 Posts
Originally Posted by jawchops View Post
Hi folks: I installed a new tube in my road bike's rear tire, but I cannot inflate the new tube.....Also, when I push on the nut, there's no telltale "psssht".
If you haven’t been able to get any air in there, there won’t be any leak on depressing the nut.

Are you using the pump head right? Maybe you’re trying to connect it with the head in the ”closed” position. Try again with the lever on the pump head the other way.
dabac is offline  
Old 08-12-20, 03:45 AM
  #5  
jpescatore
Senior Member
 
Join Date: Oct 2017
Location: Ashton, MD USA
Posts: 842

Bikes: Trek Domane SL6 Disc, Jamis Renegade

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 242 Post(s)
Liked 117 Times in 93 Posts
This may sound gross but: with the nut fully loosened on the presta valve, you should be able to blow air into the tire with your mouth. If that works, not the valve.

The other posts asked the right questions, one addtional one: the pump you are using can do presta valves, yes? And you have the inflation head (what you are pushing on the valve) in the presta setting if it can do both presta and schrader and isn't a dual use head?

Last edited by jpescatore; 08-12-20 at 03:57 AM.
jpescatore is offline  
Old 08-12-20, 05:55 AM
  #6  
blakcloud 
Senior Member
 
blakcloud's Avatar
 
Join Date: Aug 2007
Location: Toronto, Ontario
Posts: 2,267

Bikes: Custom Winter Cycles flat bar road bike, Trek Domane SL6, Rivendell Sam Hillborne, Brompton S/M3L (modified)

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 458 Post(s)
Liked 160 Times in 113 Posts
Originally Posted by jawchops View Post
Hi folks: I installed a new tube in my road bike's rear tire, but I cannot inflate the new tube. It's a presta valve. I unscrew the nut at the top of the valve, but cannot seat the pump on the valve. Also, when I push on the nut, there's no telltale "psssht". So, I don't know if there's something wrong with the valve, or it's user error. Any tips would be greatly appreciated!
Is the valve long enough that it sticks out of the rim far enough? Valves come in different lengths and if it is too short the pump won't grab it. If this isn't the issue, take the tube out and try inflating it and see what happens.
blakcloud is offline  
Old 08-12-20, 06:25 AM
  #7  
Tamiya
Senior Member
 
Tamiya's Avatar
 
Join Date: May 2018
Location: AU, MY, SG & ZZZzzz...
Posts: 234
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 106 Post(s)
Liked 12 Times in 10 Posts
Before I bother putting tube inside tyre, I usually inflate it first... and leave overnight or longer.
Then deflate & install.

saves a lot of rework in long run
Tamiya is offline  
Old 08-12-20, 08:37 AM
  #8  
freeranger
Senior Member
 
freeranger's Avatar
 
Join Date: Jun 2005
Location: Kentucky
Posts: 1,720

Bikes: 06 Lemond Reno, 98 GT Timberline mtn.bike

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 161 Post(s)
Liked 214 Times in 148 Posts
In addition to what others have said, think about how a presta valve functions. There is no spring (like a shrader) to bring the valve back up to seal. It relies on the pressure in the tube. So when the tube is completely deflated, there is no pressure pushing the core back up to sealed position. You may need to try inflating a little by mouth, or maybe have the valve at 12:00 position, so the core falls closed after a pump stroke.
freeranger is offline  
Old 08-12-20, 09:10 AM
  #9  
AndrewJB
Senior Member
 
Join Date: Aug 2016
Location: Marietta, GA
Posts: 53

Bikes: FUJI Transonic 2.3; Motobecane LeChampion TI SL; Trek 2.3

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked 20 Times in 9 Posts
Make sure the valve core is tight in the stem. I just had this happen on a wheel, the valve core got slightly loose, and it would not hold air.
But wait, I just noticed OP says he can't seat the pump on the stem, that indicates he might be using the Schrader setting on the pump, as noted above.

Last edited by AndrewJB; 08-12-20 at 09:14 AM.
AndrewJB is offline  
Old 08-12-20, 12:35 PM
  #10  
jawchops
Junior Member
Thread Starter
 
Join Date: Apr 2020
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks to all for your replies. The pump seems to be fine - works fine on the front tire.

I think it is the tube - I removed the tube, inflated it a bit, and it deflated pretty quickly. Did a quick check and didn't see a hole. I should note it is an unused tube, but it had been sitting in my saddle bag for about eight years, so maybe it just exceeded its shelf life?

In any event, I'll head to the LBS and get a couple new tubes and try again. Thanks again!
jawchops is offline  
Old 08-13-20, 01:45 PM
  #11  
roth rothar
Junior Member
 
roth rothar's Avatar
 
Join Date: Jul 2020
Location: Massachusetts
Posts: 23

Bikes: Raleigh Technium, Cannodale SR600,Trek 520, Specialized Rock Hopper, Scott CR1 Pro

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Liked 5 Times in 4 Posts
Try putting the partially inflated tube in a bucket of water and you should see bubbles of air coming out from the offending leak.
roth rothar is offline  
Old 08-13-20, 01:48 PM
  #12  
jawchops
Junior Member
Thread Starter
 
Join Date: Apr 2020
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by jpescatore View Post
This may sound gross but: with the nut fully loosened on the presta valve, you should be able to blow air into the tire with your mouth. If that works, not the valve.

The other posts asked the right questions, one addtional one: the pump you are using can do presta valves, yes? And you have the inflation head (what you are pushing on the valve) in the presta setting if it can do both presta and schrader and isn't a dual use head?
Originally Posted by blakcloud View Post
Is the valve long enough that it sticks out of the rim far enough? Valves come in different lengths and if it is too short the pump won't grab it. If this isn't the issue, take the tube out and try inflating it and see what happens.
Originally Posted by Tamiya View Post
Before I bother putting tube inside tyre, I usually inflate it first... and leave overnight or longer.
Then deflate & install.

saves a lot of rework in long run
Originally Posted by freeranger View Post
In addition to what others have said, think about how a presta valve functions. There is no spring (like a shrader) to bring the valve back up to seal. It relies on the pressure in the tube. So when the tube is completely deflated, there is no pressure pushing the core back up to sealed position. You may need to try inflating a little by mouth, or maybe have the valve at 12:00 position, so the core falls closed after a pump stroke.
Originally Posted by AndrewJB View Post
Make sure the valve core is tight in the stem. I just had this happen on a wheel, the valve core got slightly loose, and it would not hold air.
But wait, I just noticed OP says he can't seat the pump on the stem, that indicates he might be using the Schrader setting on the pump, as noted above.
Thanks again - I did find a hole in the tube. Got a couple new ones today and hopefully riding by this weekend!
jawchops is offline  

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.