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

Puzzled with tube valves

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.

Puzzled with tube valves

Old 07-09-20, 09:50 PM
  #1  
vanderleicsilva
Newbie
Thread Starter
 
Join Date: Jul 2020
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Puzzled with tube valves

Hi there. A bit of newbie here, and puzzled with the valve used by my bike. It is a hybrid, Specialized CrossTrail 2018.
I already rode over 1,000 miles on this bike and never had a flat. Lucky, maybe, but decided to finally prepare for the unavoidable and buy myself some new tube. But having trouble matching what to buy.

Specialized website lists the tires as:
Trigger Sport Reflect, 60 TPI, wire bead, 700x38mm
INNER TUBES: Presta, 48mm valve

But, those valves donít look like Presta to me (I still canít post a picture here as I am a newbie). More like a metal threaded schrader. It has a center pin/check valve like any other schrader. I am confused. Guidance, please.
Thanks in advance.
vanderleicsilva is offline  
Old 07-09-20, 10:53 PM
  #2  
DiabloScott
It's MY mountain
 
DiabloScott's Avatar
 
Join Date: Sep 2006
Location: Mt.Diablo
Posts: 8,968

Bikes: Klein, Merckx, Trek

Mentioned: 58 Post(s)
Tagged: 0 Thread(s)
Quoted: 2554 Post(s)
Liked 430 Times in 252 Posts
Looks like a Schrader, works like a Schrader, it's probably a Schrader and the description is just wrong.
Anyway, if you like Schraders and your rims are drilled for Schrader size valves, you can buy Schrader replacement tubes with no concerns.

Interesting though - do you have a photo on IMGUR or someplace that you could fake a link to? Like this:

http s://i.imgur.com/XHfHjIl.jpg
DiabloScott is offline  
Old 07-10-20, 02:46 AM
  #3  
tFUnK
Senior Member
 
Join Date: Jun 2002
Location: San Jose, CA
Posts: 2,699

Bikes: Too many bikes, too little time to ride

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 102 Post(s)
Liked 46 Times in 41 Posts
If you bought the bike used the previous owner could have switched wheelsets. But then again I've never seen a metal Schrader valve with threads down it's entire valve stem.
tFUnK is offline  
Old 07-10-20, 04:47 AM
  #4  
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Posts: 7,570

Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta

Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 1158 Post(s)
Liked 550 Times in 396 Posts
Originally Posted by tFUnK View Post
If you bought the bike used the previous owner could have switched wheelsets. But then again I've never seen a metal Schrader valve with threads down it's entire valve stem.
My Continental tubes have threaded Schrader valve stems.
dsbrantjr is offline  
Old 07-10-20, 05:14 AM
  #5  
vanderleicsilva
Newbie
Thread Starter
 
Join Date: Jul 2020
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Pic

Thank you for your reply.
Bike was bought brand new.
Trying the pic again:

https://drive.google.com/file/d/1Qrx...w?usp=drivesdk

Update: I verified that now I can post images.
see below.
So, if this is not Presta, I probably canít trust the 48mm description either, and wonder what length stem for the schrader I should buy for this.

[img]blob:https://www.bikeforums.net/f256b982-ca2a-441f-8e97-9cb4a8927be4[/img]


Last edited by vanderleicsilva; 07-10-20 at 05:23 AM.
vanderleicsilva is offline  
Old 07-10-20, 06:14 AM
  #6  
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Posts: 7,570

Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta

Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 1158 Post(s)
Liked 550 Times in 396 Posts
Originally Posted by vanderleicsilva View Post
Thank you for your reply.
Bike was bought brand new.
Trying the pic again:

https://drive.google.com/file/d/1Qrx...w?usp=drivesdk

Update: I verified that now I can post images.
see below.
So, if this is not Presta, I probably canít trust the 48mm description either, and wonder what length stem for the schrader I should buy for this.
You could always measure what you've got.
dsbrantjr is offline  
Old 07-10-20, 06:17 AM
  #7  
Pop N Wood
Senior Member
 
Join Date: Jun 2020
Location: Maryland
Posts: 505

Bikes: 1982 Bianchi Sport SX, Rayleigh Tamland 1, Rans V-Rex recumbent, Fuji MTB, 80's Cannondale MTB with BBSHD ebike motor, 70's vintage Schwinn Continental and Suburban

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 238 Post(s)
Liked 172 Times in 114 Posts
Definitely a threaded Shrader

I've never paid much attention to stem length. those are fairly deep rims but pretty much any tube should be good.
Pop N Wood is offline  
Old 07-10-20, 07:03 AM
  #8  
BobbyG
Senior Member
 
BobbyG's Avatar
 
Join Date: Jan 2009
Location: Colorado Springs, CO
Posts: 5,011

Bikes: 2015 Charge Plug, 1997 Nishiki Blazer, 1984 Nishiki International

Mentioned: 52 Post(s)
Tagged: 0 Thread(s)
Quoted: 1077 Post(s)
Liked 689 Times in 339 Posts
I just bought a new inner tube for my 26" MTB-based commuter and it came with a threaded Shrader valve, same as vanderleicsilva in post #5.

It even had a lock nut like a presta valve.

When you think about it, a "traditional" Schrader valve is threaded at the top for the cap.
BobbyG 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.