Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Inner tube valve angle

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Inner tube valve angle

Old 04-16-13, 04:09 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Apr 2013
Location: Turku, Finland
Posts: 74

Bikes: '95 Fausto Coppi, '88 Miyata 712

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Inner tube valve angle

OK, haven't had this problem before, so hopefully someone can tell me if it is a problem or not.

The inner tube's valve (presta type in this case) isn't supposed to be at an angle on an inflated tire so as not to cause a rupture when braking etc.

I just put my wheels/tires together and the valve on the rear one ended up at an angle, only about 5 degrees or so, but an angle all the same.
So, is a small degree angle already dangerous? Does the valve need to be absolutely upright? ...Just hoping I don't have to take the tire off again to move the inner tube to a better position, the tires were incredibly tight ones..
TurboJ is offline  
Old 04-16-13, 04:37 PM
  #2  
Really Old Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 13,758

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 1748 Post(s)
Liked 1,186 Times in 825 Posts
It's more of an appearance issue.
You should have adequate air pressure so the tire doesn't slide on the rim when braking.
If the valve had gotten "canted" from one stop, it's going to continue getting worse on subsequent stops.
Bill Kapaun is offline  
Old 04-16-13, 04:55 PM
  #3  
Senior Member
 
caloso's Avatar
 
Join Date: Jul 2002
Location: Sacramento, California, USA
Posts: 40,865

Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur

Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 2952 Post(s)
Liked 3,105 Times in 1,417 Posts
It should point directly at the hub. I don't know if 5 degrees is enough to strain the valve, but it's possible.
caloso is offline  
Old 04-16-13, 05:01 PM
  #4  
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225

Bikes: Catrike 559 I own some others but they don't get ridden very much.

Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 642 Times in 363 Posts
If it bothers you enough to ask about it here, it's going to bother you more every time you look at it.

If it was my bike, I'd have to fix it.
Retro Grouch is offline  
Old 04-16-13, 05:05 PM
  #5  
Senior Member
 
zonatandem's Avatar
 
Join Date: Dec 2003
Location: Tucson, AZ
Posts: 11,016

Bikes: Custom Zona c/f tandem + Scott Plasma single

Mentioned: 3 Post(s)
Tagged: 1 Thread(s)
Quoted: 77 Post(s)
Likes: 0
Liked 19 Times in 11 Posts
There is a little metal knurl nut that scews onto the metal Presta stem after it is installed. Use it.
zonatandem is offline  
Old 04-16-13, 05:13 PM
  #6  
Senior Member
Thread Starter
 
Join Date: Apr 2013
Location: Turku, Finland
Posts: 74

Bikes: '95 Fausto Coppi, '88 Miyata 712

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I have it 'forced' upright with that small nut already, but does that really fix the issue?
TurboJ is offline  
Old 04-16-13, 05:19 PM
  #7  
Bicycle Repair Man !!!
 
Sixty Fiver's Avatar
 
Join Date: Sep 2007
Location: YEG
Posts: 27,272

Bikes: See my sig...

Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 67 Post(s)
Liked 128 Times in 95 Posts
Originally Posted by TurboJ
I have it 'forced' upright with that small nut already, but does that really fix the issue?
Mount tyre and tube, thread the valve nut down (this also helps with mounting the pump head), and then pressure up the tyre.

Using the nut to correct a badly canted stem is not the proper fix... it can put extra stress on the tube / valve interface if the tube is badly shifted about.
Sixty Fiver is offline  
Old 04-16-13, 05:31 PM
  #8  
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,598

Bikes: 8

Mentioned: 197 Post(s)
Tagged: 0 Thread(s)
Quoted: 7607 Post(s)
Liked 1,352 Times in 859 Posts
As long as the tube is not creeping around with an under inflated tire slipping on the rim,
to have the stem shear out of the Tube.
fietsbob is offline  
Old 04-16-13, 05:45 PM
  #9  
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Posts: 7,522

Bikes: 2008 Novara Randonee - love it. Previous bikes:Motobecane Mirage, 1972 Moto Grand Jubilee (my fave), Jackson Rake 16, 1983 C'dale ST500.

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 486 Post(s)
Liked 11 Times in 11 Posts
Originally Posted by TurboJ
I have it 'forced' upright with that small nut already, but does that really fix the issue?
It's not terrible but it does not fix the issue and potentially could cause problem, as the tube will be slightly stretched next to the valve right off, and could get worse if the tube/tire does migrate. If you completely deflate the tire you should be able to slide the tire/tube enough to straighten it. After that do make sure you keep your tires inflated.
cny-bikeman is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
JenCor
Bicycle Mechanics
26
06-21-17 07:32 PM
ammarolli
Bicycle Mechanics
20
01-13-17 05:29 PM
RT Metro
Bicycle Mechanics
3
07-25-11 12:25 AM
Trill_01
Bicycle Mechanics
6
07-13-10 08:46 PM
ph4nt0mf1ng3rs
Singlespeed & Fixed Gear
33
01-09-10 12:51 PM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.