Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

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!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 07-17-12, 09:20 AM   #1
mrund3rd09
Senior Member
Thread Starter
 
Join Date: Apr 2011
Location: iowa
Bikes:
Posts: 156
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is it me or the tube?

So yesterday, I had to walk home because my front tire was flat. I ride a vintage road bike and my front uses schrader, btw. It turns out, the valve was partially severed from the tube. So I switched it out with my backup, made sure the valve was pointing straight, and everything looked normal. And this morning, the front tire was dead flat again. I didn't have time to check what was wrong with it, but I suspect that the valve got severed again, because I checked for leaks on the tube the night before. When pumped up, the tube is uneven with some places thicker than others, but I didn't think much of it.

Am I putting too much pressure into my tires? I try to get it around 100, which I assume drops to ~90 when I remove the pump attachment. One thing I noticed was that if I pull too hard on the valve when I try to detach the pump, the valve would start sticking out more, with some of the rubber tube dragging out at the base of the valve. This happens almost all the time to me with my bike/pump. At that point, I would just release the air and start pump all over again.

Do I need a new pump? Am I doing something wrong?
mrund3rd09 is offline   Reply With Quote
Old 07-17-12, 09:28 AM   #2
ahsposo 
Big Blubbery Member
 
ahsposo's Avatar
 
Join Date: Jan 2010
Location: On a floe
Bikes: A Home Built All Rounder, Bianchi 928, Specialized Langster, Dahon Folder
Posts: 7,060
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Let's make sure we are on the same page.

ahsposo is offline   Reply With Quote
Old 07-17-12, 10:58 AM   #3
zaqwert6
New but not Noob
 
Join Date: Jun 2012
Location: Central Florida
Bikes: Madone Litespeed Paramount Colnago
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
100psi into a schrader?
zaqwert6 is offline   Reply With Quote
Old 07-17-12, 11:56 AM   #4
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by zaqwert6 View Post
100psi into a schrader?
A schrader valve will handle 100 psi with ease.

It sounds to me like the OP is tearing the valve stem while removing his pump chuck.
Retro Grouch is online now   Reply With Quote
Old 07-17-12, 01:14 PM   #5
mrund3rd09
Senior Member
Thread Starter
 
Join Date: Apr 2011
Location: iowa
Bikes:
Posts: 156
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I try to be as gentle as I can, believe me. I would shake that thing from side to side in an oscillating motion until it comes off. Sometimes, it would just not come off, and when I pull harder, the valve drags part of the tube out with it, and then I have to let the air out and do it over.
mrund3rd09 is offline   Reply With Quote
Old 07-17-12, 01:36 PM   #6
SteamingAlong
Senior Member
 
Join Date: May 2012
Location: North Attleboro, MA
Bikes: 2011 Steamroller; 1998 Cannondale F-400; 1981 Motobecane Jubilee Sport
Posts: 231
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Could be the brand of tube you're using too. Sun tubes SUCK for instance. Their valves are garbage.
SteamingAlong is offline   Reply With Quote
Old 07-17-12, 01:43 PM   #7
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by mrund3rd09 View Post
I try to be as gentle as I can, believe me. I would shake that thing from side to side in an oscillating motion until it comes off. Sometimes, it would just not come off, and when I pull harder, the valve drags part of the tube out with it, and then I have to let the air out and do it over.
Are you sure that you're using your pump chuck right? Some you pull the lever out to release the chuck and on some you push it in to release the chuck. Look into the end of the chuck and see if it seems to get bigger or smaller when you pull the lever out.

Last edited by Retro Grouch; 07-17-12 at 01:46 PM.
Retro Grouch is online now   Reply With Quote
Old 07-17-12, 01:50 PM   #8
zaqwert6
New but not Noob
 
Join Date: Jun 2012
Location: Central Florida
Bikes: Madone Litespeed Paramount Colnago
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Retro Grouch View Post
A schrader valve will handle 100 psi with ease.

It sounds to me like the OP is tearing the valve stem while removing his pump chuck.
Well obviously the valve itself is.

I just don't run into too many schrader valved HP bike tires myself.
zaqwert6 is offline   Reply With Quote
Old 07-17-12, 02:02 PM   #9
ahsposo 
Big Blubbery Member
 
ahsposo's Avatar
 
Join Date: Jan 2010
Location: On a floe
Bikes: A Home Built All Rounder, Bianchi 928, Specialized Langster, Dahon Folder
Posts: 7,060
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Can you not hold the stem while pulling on the chuck?

I was initially confused. To me the valve is the little springy thing that is inside the stem on a schrader type. I couldn't see how you damaging that.

On my hybrid that has schrader type valves I've started buying longer stems so I can grab them while removing the chuck because I too have ripped stems right off the tube.
ahsposo is offline   Reply With Quote
Old 07-17-12, 02:18 PM   #10
mrund3rd09
Senior Member
Thread Starter
 
Join Date: Apr 2011
Location: iowa
Bikes:
Posts: 156
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Right, I'm switching to presta valves. I just went to the store to buy the rim adapter. I figure because the diameter of the valve is large, and the width of the tube is small, it's a lot easier to pull the tube out through the larger hole in the rim. I don't think that will be the case with presta valves. Besides, presta valves are very well built at the stem, so I don't have to worry about it again... someone mentioned that sun tubes suck? why? I'm on amazon purchasing a thorn proof tube, and the cheapest ones are avenir and sunlite
mrund3rd09 is offline   Reply With Quote
Old 07-17-12, 02:30 PM   #11
alhedges
Senior Member
 
alhedges's Avatar
 
Join Date: Mar 2008
Location: Naptown
Bikes: NWT 24sp DD; Brompton M6R
Posts: 1,133
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Schwalbe schraeder tubes are built like presta tubes - metal valves threaded down to the rim where there's a locknut. They are the only tubes I'll buy.
alhedges is offline   Reply With Quote
Old 07-17-12, 04:02 PM   #12
mrund3rd09
Senior Member
Thread Starter
 
Join Date: Apr 2011
Location: iowa
Bikes:
Posts: 156
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
the thing I don't like about schrader is the rubber part of the stem is exposed and vulnerable. If that part gets a leak, then the tube is done because the patch won't do a very good job. I'll double check, but I think I got my tube from the local bike store, which supposedly sells good stuff. Anyways, I'm switching to presta. I think the valves are more suitible for road bikes for their thinner neck and their sturdy construction at the valve stem. Plus, I don't think I will have to worry about yanking the pump clamp off of the valve anymore.
mrund3rd09 is offline   Reply With Quote
Old 07-17-12, 04:12 PM   #13
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by mrund3rd09 View Post
Plus, I don't think I will have to worry about yanking the pump clamp off of the valve anymore.
Don't bet the rent money. There have been dozens of threads from posters who have torn presta tubes at the base of the valve stem.
Retro Grouch is online now   Reply With Quote
Old 07-17-12, 05:30 PM   #14
JanMM
rebmeM roineS
 
JanMM's Avatar
 
Join Date: Jan 2006
Location: In Central IN
Bikes: RANS V3, RANS V-Rex, RANS Screamer
Posts: 13,225
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by zaqwert6 View Post
I just don't run into too many schrader valved HP bike tires myself.
Tires don't care what kind of valve the tube has.
__________________
RANS V3 - Ti, RANS V-Rex - cromo, RANS Screamer - cromo
JanMM is online now   Reply With Quote
Old 07-17-12, 06:06 PM   #15
zaqwert6
New but not Noob
 
Join Date: Jun 2012
Location: Central Florida
Bikes: Madone Litespeed Paramount Colnago
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by JanMM View Post
Tires don't care what kind of valve the tube has.


Whats with you guys? Just trying to be sure we know what where talking about.

Sheesh. Any chance YOU actually offering some help instead of being a smart a$$?

Yea, didn't think so.
zaqwert6 is offline   Reply With Quote
Old 07-17-12, 06:29 PM   #16
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by zaqwert6 View Post
Whats with you guys? Just trying to be sure we know what where talking about.

Sheesh. Any chance YOU actually offering some help instead of being a smart a$$?

Yea, didn't think so.
Quote:
Originally Posted by zaqwert6 View Post
100psi into a schrader?
So explain. How does "100psi into a schrader?" help the OP resolve his tearing his tube at the valve stem problem?
Retro Grouch is online now   Reply With Quote
Old 07-17-12, 06:49 PM   #17
BlazingPedals
Senior Member
 
BlazingPedals's Avatar
 
Join Date: Dec 2004
Location: Middle of da Mitten
Bikes: Trek 7500, RANS V-Rex, Optima Baron, Velokraft NoCom, M-5 Carbon Highracer, homebuilt recumbent
Posts: 8,733
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'd be glad to help -- if you weren't the better part of a thousand miles away. The problem is, without looking at what you've got, it's hard to say what's going on. You could have a burr on your rim, at the valve stem hole. You say it's a vintage bike - is it steel rims? A pinched tube is a possibility for the second flat; but without inspecting I can't tell. Schrader valve stems are pretty sturdy; I doubt that 'normal' handling will rip one out in a day. Unless the tube is old and the rubber is failing.

JanMM's statement was true. Don't blame the type of valve; something else is going on.
BlazingPedals is offline   Reply With Quote
Old 07-17-12, 07:05 PM   #18
bkaapcke
Senior Member
 
Join Date: Jul 2005
Bikes:
Posts: 3,218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
When you change out the tube, check the valve stem hole in the rim. Are the edges smooth and free of burs? If nor, fix this before you complete the repair. If your rims were presta and someone drilled them out for schrader, the hole could have sharp edges. And alhedges is right. Schwalbe schrader tubes are the best. bk
bkaapcke is offline   Reply With Quote
Old 07-17-12, 07:38 PM   #19
no1mad
Thunder Whisperer
 
no1mad's Avatar
 
Join Date: Apr 2008
Location: NE OK
Bikes: '06 Kona Smoke
Posts: 8,622
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Quote:
Originally Posted by mrund3rd09 View Post
So yesterday, I had to walk home because my front tire was flat. I ride a vintage road bike and my front uses schrader, btw. It turns out, the valve was partially severed from the tube. So I switched it out with my backup, made sure the valve was pointing straight, and everything looked normal. And this morning, the front tire was dead flat again. I didn't have time to check what was wrong with it, but I suspect that the valve got severed again, because I checked for leaks on the tube the night before. When pumped up, the tube is uneven with some places thicker than others, but I didn't think much of it.

Am I putting too much pressure into my tires? I try to get it around 100, which I assume drops to ~90 when I remove the pump attachment. One thing I noticed was that if I pull too hard on the valve when I try to detach the pump, the valve would start sticking out more, with some of the rubber tube dragging out at the base of the valve. This happens almost all the time to me with my bike/pump. At that point, I would just release the air and start pump all over again.

Do I need a new pump? Am I doing something wrong?
1. What's the rating on the tire's sidewall?
2. Possibly. What type of pump are you using? Floor pump, one of those rigid sticks, or something like the Topeak Road Morph?
__________________
Community guidelines

Last edited by no1mad; 07-17-12 at 07:45 PM.
no1mad is offline   Reply With Quote
Old 07-18-12, 10:36 AM   #20
mrund3rd09
Senior Member
Thread Starter
 
Join Date: Apr 2011
Location: iowa
Bikes:
Posts: 156
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
1. 100 psi, but I've been told by people on here that's not really an issue
2. walmart pump that has both presta and schrader ends.

Quote:
When you change out the tube, check the valve stem hole in the rim. Are the edges smooth and free of burs? If nor, fix this before you complete the repair. If your rims were presta and someone drilled them out for schrader, the hole could have sharp edges. And alhedges is right. Schwalbe schrader tubes are the best. bk
you might be right. I bought the bike from an old man who rides for fun. He might have gotten the hole drilled. But that shouldn't be an issue anymore, considering I just put in presta fittings that have pretty blunt edges. I also like how the stem is like a screw that you can lock into place on the rim, so the tube never slides.

My 2nd flat was due to a poor patch job, not a valve problem. I could see an air pocket collecting in the middle of the patch, where the hole was. The tube itself didn't look like it was in great shape either.

Because I hate getting flats, I want to get a thorn resistant tube - one of those thick ones. Does anyone have a good suggestion for a presta valve 27x1-1/4 tube that's well built and cheap as well?
mrund3rd09 is offline   Reply With Quote
Old 07-18-12, 02:39 PM   #21
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by mrund3rd09 View Post
I also like how the stem is like a screw that you can lock into place on the rim, so the tube never slides.
Go gentle with the presta valve nuts. I used to have a delightful Chinese bike mechanic who called them "the work of the devil". If you take a corner too hard, the tire will deform and the tube won't be able to conform with the tire. When that happens it'll tear the tube at the base of the valve stem. Personally, I throw those little valve stem nuts away. I don't want any workings of the devil on my bike.
Retro Grouch is online now   Reply With Quote
Old 07-18-12, 04:53 PM   #22
DX-MAN
Banned
 
Join Date: Jun 2009
Bikes:
Posts: 4,789
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Retro, about those little 'works of the devil'...my experience is, pump the tire up to max or near it (60psi is my benchmark, 26x2.1 tires), SNUG the nut, and when the pressure goes down to where you like it, you'll have the flex you need. Has worked for me for 7+ years.
DX-MAN is offline   Reply With Quote
Old 07-19-12, 11:03 AM   #23
mrund3rd09
Senior Member
Thread Starter
 
Join Date: Apr 2011
Location: iowa
Bikes:
Posts: 156
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
interesting. I'll loosen the nut a little. I never really corner too hard. I never have ever since I tried to corner at a 90 degree angle on a flat tire when I was in 4th grade, with sand on the pavement... that was the last time I cornered anything.

Would that be why schrader valves tear at the base stem if the rim hole is too sharp?
mrund3rd09 is offline   Reply With Quote
Old 07-19-12, 12:07 PM   #24
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,392
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by mrund3rd09 View Post
Would that be why schrader valves tear at the base stem if the rim hole is too sharp?
I don't know. That's a problem that I've never encountered. I'm wondering is somebody drilled out the valve hole for schrader valves and didn't de-burr the hole.
Retro Grouch is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 12:05 PM.