Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Continual Back Tire flat

Notices
Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Continual Back Tire flat

Old 06-10-09, 07:48 AM
  #1  
daltri1
Senior Member
Thread Starter
 
Join Date: Jul 2008
Posts: 52
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Continual Back Tire flat

Last weekend, I did a ride and when I got done, I noticed that the back tire was almost flat. I aired it back up (120psi), and when I got home (about 15 mins), I noticed it was flat all the way. So last night I took out the tube, replaced it with another and aired it up. This morning I noticed the tire was completely flat again. What the **** is going on? The tube is not pinched.....it'll air up to 120psi, and looks to stay there......but after a while it goes completely flat. Any ideas?
daltri1 is offline  
Old 06-10-09, 07:52 AM
  #2  
Creakyknees
ride lots be safe
 
Creakyknees's Avatar
 
Join Date: Jan 2007
Location: Texas
Posts: 5,223
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
you have discovered why you should never replace a tube until you find the source of the original flat....

likely whatever caused the first flat is still in the tire.
Creakyknees is offline  
Old 06-10-09, 07:53 AM
  #3  
kayakdiver
ah.... sure.
 
kayakdiver's Avatar
 
Join Date: Mar 2008
Location: Whidbey Island WA
Posts: 4,107

Bikes: Specialized.... schwinn..... enough to fill my needs..

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
you need to remove the tube and tire and find the problem. little piece of glass or something I would guess is poking through. visually inspect the outside and then run your hand lightly on the inside and find the culprit.
kayakdiver is offline  
Old 06-10-09, 07:57 AM
  #4  
ri_us
Senior Member
 
Join Date: Sep 2006
Posts: 776
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
This has been a pain for me from time to time. Every time I get a flat I inspect the inside and outside of the tire to be sure that no sharp object is lodged in it. Use your finger in addition to your eyes as some small objects may be hard to see, but easier to feel.

If flats persist, check the rim for burrs, sharp edges, etc. And, replace the rim tape. Sometimes, as you put miles on a wheel, it changes shape slightly and can leave a sharp edge exposes that works into your tube.

I would suggest doing these things with someone who has done them before. It's easy to do some of this wrong and hard to describe.
ri_us is offline  
Old 06-10-09, 07:58 AM
  #5  
Beaker
moth -----> flame
 
Beaker's Avatar
 
Join Date: Dec 2007
Location: SF Bay Area
Posts: 5,914

Bikes: 11 CAAD 10-4, 07 Specialized Roubaix Comp, 98 Peugeot Horizon

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
check your rim tape too to make sure that the spoke holes/undersides of the nipples are covered.
__________________
BF, in a nutshell
Beaker is offline  
Old 06-10-09, 08:09 AM
  #6  
AEO
Senior Member
 
AEO's Avatar
 
Join Date: Jun 2007
Location: A Coffin Called Earth. or Toronto, ON
Posts: 12,258

Bikes: Bianchi, Miyata, Dahon, Rossin

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
all it takes is a small pin prick.

inflate the tube and submerge it in water, you'll find the puncture.
__________________
Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
http://sanfrancisco.ibtimes.com/arti...ger-photos.htm
AEO is offline  
Old 06-10-09, 08:14 AM
  #7  
daltri1
Senior Member
Thread Starter
 
Join Date: Jul 2008
Posts: 52
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks all. I thought I inspected the tire well enough, but obviously not.....I'll do a more thorough inspection.....
daltri1 is offline  
Old 06-10-09, 08:40 AM
  #8  
Lamp-Shade
Bulimic Arsonist.
 
Lamp-Shade's Avatar
 
Join Date: May 2008
Location: Flagstaff, AZ
Posts: 393
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
What I like doing is folding the tire so the surface is stretched out. That makes it wicked easy to see and pick out peices of glass, etc.
Lamp-Shade is offline  
Old 06-10-09, 10:01 AM
  #9  
CiaoFun
Senior Member
 
Join Date: Jul 2007
Posts: 80

Bikes: Niner Air 9 RDO, BMC Team Machine SLR01

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I had a mystery flat problem as well. Turns out the plastic rim tape that came on the bike had a slightly jagged edge and that was causing the hole/ tear. Since the damage was done on the rim side of the tube, I didn't look hard enough the first time...
CiaoFun is offline  
Old 06-10-09, 10:02 AM
  #10  
sstorkel
Senior Member
 
Join Date: Apr 2008
Posts: 5,427

Bikes: Cervelo RS, Specialized Stumpjumper FSR Pro, Schwinn Typhoon, Nashbar touring, custom steel MTB

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by daltri1 View Post
Thanks all. I thought I inspected the tire well enough, but obviously not.....I'll do a more thorough inspection.....
As others have mentioned: you'll want to inspect the tire, the tube, and the rim for any problems/imperfections. I check both the outside and inside of the tire after a flat. After repeated flats, I'll also take a look at the rim to make sure that the rim tape is still good, the bead is perfect, and there's no debris stuck anywhere in the rim. In addition to visual inspection, I run my fingers over every surface; there are many types of problems that are easier to feel than to see.
sstorkel is offline  
Old 06-10-09, 10:05 AM
  #11  
lotek 
Senior Member
 
lotek's Avatar
 
Join Date: Dec 2001
Location: n.w. superdrome
Posts: 17,689

Bikes: 1 trek, serotta, rih, de Reus, Pogliaghi and finally a Zieleman! and got a DeRosa

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
An easy way to find glass splinters, or wire in a tire is to run a cotton ball along the inside of
your tire (both directions) whatever is there will snag the cotton.

Marty
__________________
Sono più lento di quel che sembra.
Odio la gente, tutti.


Want to upgrade your membership? Click Here.
lotek is offline  
Old 06-10-09, 10:22 AM
  #12  
MR6690
Senior Member
 
MR6690's Avatar
 
Join Date: May 2009
Location: Boston
Posts: 160
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
anytime I get a flat, right after I take the tub out I always rub my glove all the way around the inside of the tire.

Seems to do a good job of dislodging whatever was causing the problem
MR6690 is offline  
Old 06-10-09, 10:53 AM
  #13  
RoboChrist
Swollen Member
 
RoboChrist's Avatar
 
Join Date: Mar 2009
Location: Toronto ON
Posts: 395

Bikes: Linus Roadster 8

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Massage those tires dude
RoboChrist is offline  
Old 06-10-09, 11:45 AM
  #14  
merckx_rider
OUTLAW BIKER
 
merckx_rider's Avatar
 
Join Date: Aug 2008
Location: So Cal
Posts: 512

Bikes: Eddy Merckx team 7-11 Corsa Extra Full Dura Ace, 2015 Equalizer Electric Fat Tire Bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
lodged in the tire??? some sort of debris?
merckx_rider is offline  
Old 06-10-09, 12:27 PM
  #15  
bobthib
Legs; OK! Lungs; not!
 
bobthib's Avatar
 
Join Date: Apr 2009
Location: Coral Springs, FL
Posts: 2,096

Bikes: ''09 Motobecane Immortal Pro (Yellow), '02 Diamondback Hybrid, '09 Lamborghini Viaggio, ''11 Cervelo P2

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 4 Times in 1 Post
Lotsa good advise above. Let me throw in my 2cents. Like AEO said above, inflate the tire and put it under water. THEN note the relationship of the leak to the valve. If the valve is at 12 o'clock and the leak is at 5, check both the rim and tire at both the 5 and 7 oclock position (just incase you don't remember just how the tube was mounted. It will also tell you if the puncture was on the tire side or the rim side. It really helps to focus your attention to the correct area.

If you don't find anything in the tire after careful inspection, suspect the rim or tape, especially plastic rim tape. I had some new brand new shimano rims and after about 500 miles I got a cut in the tube right near the hole for the valve.
bobthib 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

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