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


Go Back   > >

Commuting Bicycle commuting is easier than you think, before you know it, you'll be hooked. Learn the tips, hints, equipment, safety requirements for safely riding your bike to work.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-14-08, 08:18 PM   #1
macteacher
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Suburbia, Ontario
Bikes: Specialized FSR
Posts: 882
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Any idea what would have caused this flat?

Hi All,

I just got my new pasela's 1.125" tires. I used the bike the other day with a light load on the pannier with no problems.

I got up for my commute in the morning and I found my bike on the ground...(didn't know why as it has a kickstand). Anyhow, I put it upright, load my pannier (both combined they were heavy. Maybe 30-35lbs altogether? I never carry this much weight. I did not sit on the bike but yesterday it supported my weight of 160lbs...So I can't figure it out. Could it have been the weight of the pannier sitting directly over the tire? I've never seen a whole of this caliber before. Tube and tire are new have 1km of riding on them.

I roll the bike out of the garage and was about to get on, when I noticed the flat.

I did not hear a popping noise when I loaded the pannier.



macteacher is offline   Reply With Quote
Old 04-14-08, 10:32 PM   #2
randomgear
Senior Member
 
Join Date: Jul 2006
Location: beantown
Bikes: '89 Specialized Hardrock Fixed Gear Commuter; 1984? Dawes Atlantis
Posts: 866
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
The only time I have had a hole like that is when I had a hole in my sidewall.
Caused a nice loud BANG in my apartment when I pumped up the tire. I patched it and on my to work the next morning it let out again - straight through the patch. Since it was about 20 degrees out, and it happened in front of my LBS, I had them replace the tube. The mechanic noticed the tube starting to poke out of the sidewall. So, new tube and tire.
Check your tire, and good luck.
randomgear is offline   Reply With Quote
Old 04-14-08, 10:48 PM   #3
richardmasoner
Fritz M
 
richardmasoner's Avatar
 
Join Date: Mar 2005
Location: California
Bikes: Trek, Spesh, GT, Centurion
Posts: 960
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by randomgear View Post
The only time I have had a hole like that is when I had a hole in my sidewall.
Ditto. Check for a hole in the tire.

Another possibility -- your tube wasn't installed correctly. A portion of it might have been pinched between the rim and tire.
richardmasoner is offline   Reply With Quote
Old 04-15-08, 03:02 AM   #4
CB HI
Cycle Year Round
 
CB HI's Avatar
 
Join Date: Mar 2005
Location: Honolulu, HI
Bikes:
Posts: 11,947
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 187 Post(s)
It is a blow out, normally caused by a sidewall cut/tear (as noted by others) OR the tire was not fully seated and the tube bulged out between the tire and rim.
CB HI is offline   Reply With Quote
Old 04-15-08, 08:17 AM   #5
SDRider
Cat None
 
SDRider's Avatar
 
Join Date: Aug 2005
Location: San Diego
Bikes: LOOK KG 461, LeMond Zurich, Giant Talon 29er 0
Posts: 4,510
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by CB HI View Post
It is a blow out, normally caused by a sidewall cut/tear (as noted by others) OR the tire was not fully seated and the tube bulged out between the tire and rim.
I've had properly mounted tires blow off the rim. Cause: Cheap Performance brand 700x23c road tires and tubes. Front blew off the rim as I was pumping it up. Rear blew off the rim on my ride home the next evening, I replaced the tube, remounted the tire and it was about to blow off the rim again when I got home. I took both tires back and had them credit me the full price toward some Continentals which gave me no problems at all.
SDRider is offline   Reply With Quote
Old 04-15-08, 08:46 AM   #6
ericthered
Senior Member
 
Join Date: Jul 2007
Location: Knoxville TN
Bikes: Surley Crosscheck, 1988 Rockhopper Commuter
Posts: 138
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Might check the rim strip, I could not tell where on the tube the hole was located. A pushed over rim strip caused tiny star holes that I suppose could be a weak point under a larger load.
Eric
ericthered is offline   Reply With Quote
Old 04-15-08, 08:56 AM   #7
tate65
crash survivor
 
tate65's Avatar
 
Join Date: Aug 2007
Location: Irving, TX
Bikes: C-dale rush, Mountain cycle fury, Monocog 29er, Haro hard tail VX, Scattante R330
Posts: 654
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have seen this with defective tubes. I was sitting home one evening after 3-4 commutes on new tubes heard this explosion in the garage only to find my tire flat, when I removed the tube it looked just like yours. I suspect there was a weak spot they finally failed and because of the high pressure it exploded.
tate65 is offline   Reply With Quote
Old 04-15-08, 04:50 PM   #8
macteacher
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Suburbia, Ontario
Bikes: Specialized FSR
Posts: 882
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks guys. I went back to the BS that originally put the tube in along with the new tires. They had no explanation as to what would caused it. That said, they replaced the tube free of charge. Hopefully it won't fail me tomorrow on my way to work.
macteacher is offline   Reply With Quote
Old 04-15-08, 08:14 PM   #9
ncherry
Linux HA Author :-)
 
ncherry's Avatar
 
Join Date: Jun 2007
Location: Central Jersey (USA)
Bikes: '91 Trek 1100, '98 Mongoose RX100, '06 Giant TCR Composite 2
Posts: 332
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That looks like a pinch flat. When putting the tire back on sometimes the tube creeps under and around the hook of the tire. It usually doesn't blow immediately but after riding for a little while. If it is a pinch flat what you want to do is the put on the tire then before pumping it up check that the tube is inside the tire and not under the tire. Also make sure that the tire is properly hooked on the rim.

One other thing to note. If you have older rims (pre 7 speed?). Don't pump the tire past 90 psi. The older rims are not made to handle the high pressure tires. One gentleman on our double century blew 3 tubes before we figured that out (we thought he purchased new rims).
ncherry is offline   Reply With Quote
Old 04-15-08, 08:26 PM   #10
CB HI
Cycle Year Round
 
CB HI's Avatar
 
Join Date: Mar 2005
Location: Honolulu, HI
Bikes:
Posts: 11,947
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 187 Post(s)
Quote:
Originally Posted by ncherry View Post
That looks like a pinch flat.
You Jersey folks must define pinch flats differently than any place I have ridden.

For everyone I know, a pinch flat looks like a snake bite. Caused by riding on a tire at too low a pressure, hitting a pothole or curb which presses the tube against the rim causing the 2 holes in the tube.
CB HI is offline   Reply With Quote
Old 04-15-08, 09:21 PM   #11
macteacher
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Suburbia, Ontario
Bikes: Specialized FSR
Posts: 882
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by ncherry View Post
One other thing to note. If you have older rims (pre 7 speed?). Don't pump the tire past 90 psi. The older rims are not made to handle the high pressure tires. One gentleman on our double century blew 3 tubes before we figured that out (we thought he purchased new rims).
Thanks for the tip. My bike is almost 20 years old...the rims are roughly 10 years old. I'll check the PSI before I leave for work tomorrow
macteacher is offline   Reply With Quote
Old 04-16-08, 07:21 PM   #12
ncherry
Linux HA Author :-)
 
ncherry's Avatar
 
Join Date: Jun 2007
Location: Central Jersey (USA)
Bikes: '91 Trek 1100, '98 Mongoose RX100, '06 Giant TCR Composite 2
Posts: 332
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by CB HI View Post
You Jersey folks must define pinch flats differently than any place I have ridden.

For everyone I know, a pinch flat looks like a snake bite. Caused by riding on a tire at too low a pressure, hitting a pothole or curb which presses the tube against the rim causing the 2 holes in the tube.
You are correct, I used the wrong term. I can't remember correct term.
ncherry is offline   Reply With Quote
Old 04-16-08, 08:17 PM   #13
CB HI
Cycle Year Round
 
CB HI's Avatar
 
Join Date: Mar 2005
Location: Honolulu, HI
Bikes:
Posts: 11,947
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 187 Post(s)
Quote:
Originally Posted by ncherry View Post
You are correct, I used the wrong term. I can't remember correct term.
I am not sure that I have ever heard a term for a flat caused by the tube ballooning out between the tire and the rim. Maybe someone can clue both of us in or confirm that there is no common term.
CB HI is offline   Reply With Quote
Old 04-16-08, 09:16 PM   #14
genel
Senior Member
 
genel's Avatar
 
Join Date: Dec 2004
Location: Antioch, IL
Bikes: Giant Defy Advanced I, Montague folding bike, and Cannondale Road Warrior 500
Posts: 326
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've heard, read and used the term "pinch flat" for both pinching the tube during an install and pinching the tire while hitting a rock.

Only time I've seen something similar, I had about a 1/4 inch cut in the sidewall, and while the bike was just sitting in the car, after(!) a 35m ride, the tube blew out through that lttle cut. Looked exactly like that. Not saying that's what caused this though.
__________________
"Why is there a hill after every meal, but not a meal after every hill?"
--Overheard on Grabaawr
genel is offline   Reply With Quote
Old 04-16-08, 09:23 PM   #15
Mr. Underbridge
Senior Member
 
Join Date: Mar 2007
Location: Reston, VA
Bikes: 2003 Giant OCR2
Posts: 2,369
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by CB HI View Post
I am not sure that I have ever heard a term for a flat caused by the tube ballooning out between the tire and the rim. Maybe someone can clue both of us in or confirm that there is no common term.
Hernia?
Mr. Underbridge 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 07:52 AM.