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


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-22-05, 09:02 PM   #1
croshaven
Senior Member
Thread Starter
 
Join Date: Feb 2004
Location: Fort Worth
Bikes: Rivendell Romulus
Posts: 67
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A series of unexplained flats

I'm using 35 mm tires on my touring bike with 28/38 Specialized tubes. I've had three flats in quick succession, all in about the same place and each a very small hole, so small that it takes overnight for the tire to flat and you have to put it underwater to find the leak.
I've examined the tire and rim around where the flat occurs with a magnifying glass, washed and dried the inside of the tire with a towel, and rewrapped the rim with new tape. I can't find any thing that would have caused these flats. I've used the rim for more than a year with 28 mm tires without a problem.
I was inflating the tires to 80 instead of 60, the recommended pressure. Could that be the cause? I inflated to 60 for today's ride and so far so good but one day does not a test make. Besides, there could be a small hole in it now but I still wouldn't know till tomorrow morning.

Any suggestions?
croshaven is offline   Reply With Quote
Old 10-22-05, 11:06 PM   #2
Brian
Senior Member
 
Brian's Avatar
 
Join Date: Nov 2004
Location: Between the mountains and the lake.
Bikes: 8 bikes - one for each day of the week!
Posts: 16,683
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm guessing you don't index your tire? If you line up the hot patch with the valve stem, you'll know where to check the tire for debris. I've had a customer come in with 3 flats in the same tube. He checked it 3 times, I checked it in the store once, inside and out. While he selected a new tire, I half-absently mindedly went over it again. Sure enough, there was a tiny sliver of glass in one of the cracks of the tire. It had a happy life in there. He would inflate the tire, and let it sit overnight. The next day, when he would ride it, the pressure of his weight was enough to force the happy little piece of glass into the tube. Remove the pressure, and it went back into hiding in the rubber. There are 3 lessons to be learned here.
Brian is offline   Reply With Quote
Old 10-25-05, 06:21 AM   #3
croshaven
Senior Member
Thread Starter
 
Join Date: Feb 2004
Location: Fort Worth
Bikes: Rivendell Romulus
Posts: 67
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I did index the tire.
croshaven is offline   Reply With Quote
Old 10-25-05, 06:28 AM   #4
StanSeven
Super Moderator
 
Join Date: Feb 2005
Location: Delaware shore
Bikes: Cervelo C3, Guru Photon, Waterford, Specialized CX
Posts: 12,003
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 163 Post(s)
You've got some pretty thick tread there. There's a good chance you still have a little sliver of glass or metal shaving caught in the rubber. It works itself to the tube through the pressure of riding.

I would try once more to find the object. Turn the tire inside out and slowly go through and twist and bend until you find it. If you come up empty, buy a new tire.
StanSeven is online now   Reply With Quote
Old 10-25-05, 02:48 PM   #5
Brian
Senior Member
 
Brian's Avatar
 
Join Date: Nov 2004
Location: Between the mountains and the lake.
Bikes: 8 bikes - one for each day of the week!
Posts: 16,683
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If it's indexed, you should be able to find the offending particle in the tire.
Brian is offline   Reply With Quote
Old 10-25-05, 05:06 PM   #6
webist
Huachuca Rider
 
webist's Avatar
 
Join Date: Jun 2002
Location: Charlotte, NC
Bikes: Fuji CCR1, Specialized Roubaix
Posts: 4,275
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I sometimes miss the tiny end of a thorn sticking through the tire. With an indexed tire I can usually find the offending thorn tip by folding the tire and rubbing on the fold.
__________________
Just Peddlin' Around
webist is offline   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 06:37 PM.