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 11-17-10, 09:52 AM   #1
auchencrow 
Senior Member
Thread Starter
 
auchencrow's Avatar
 
Join Date: Apr 2009
Location: Detroit
Bikes:
Posts: 10,330
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Tire problem - What do you think caused it?

Recently I noticed a little unevenness in the ride on my Nishiki, and saw that my rear tire had developed what I call a "wow" or a "warp", such that the tread was no longer centered, and the sidewall darn near rubbed the chainstay.

- Yet there was no localized bulge in the side wall at all, no obvious tread separation, and it was a relatively new tire when I bought the bike 2 years ago.

However - When I replaced the tire, I saw this:



What caused this? Is there a way to prevent it?
__________________
- Auchen
auchencrow is offline   Reply With Quote
Old 11-17-10, 10:01 AM   #2
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 30,838
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Quoted: 862 Post(s)
The cords broke down and eventually gave out. Causes include both over and under inflation, and possibly heavy use on rough roads. I don't understand what you mean by relatively new when you bought it 2 years ago. If you bought the bike or tire used, there's no telling how old it actually was even if the tread showed little wear. It's a consideration because tires age not only in miles but over time and old tires are more prone to this kind of breakdown.

As for preventing it, the key is to keep your tire properly inflated between 80-100% of the sidewall pressure rating, and to wear it out before 5 years or so.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is online now   Reply With Quote
Old 11-17-10, 10:35 AM   #3
canopus 
Senior Member
 
canopus's Avatar
 
Join Date: Mar 2009
Location: Kingwood, TX
Bikes: 1985 Cannondale SR300, 1985 Cannondale ST400, 1984 Trek 760, 1984 Trek 610, 1984 Trek 720, 1981 Trek 710, 1979 Trek 710, Gary Littlejohn Cruiser, BMX
Posts: 1,218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Also once one cord goes, it places more stress on the others around it so that they will fail faster. If you had a puncture in one of those cords in the past sometime then they could eventually lead to that kind failure. Old BMX Snakebelly tires were notorious for it, Firestone car tires were the worst. Haven't seen it to much on quality bicycle tires but pressure is pressure.
__________________
1984 Cannondale ST
1985 Cannondale SR300
1980 Gary Littlejohn Cruiser
1984 Trek 760
1981 Trek 710
Pics
canopus is offline   Reply With Quote
Old 11-17-10, 11:20 AM   #4
auchencrow 
Senior Member
Thread Starter
 
auchencrow's Avatar
 
Join Date: Apr 2009
Location: Detroit
Bikes:
Posts: 10,330
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Quote:
Originally Posted by FBinNY View Post
... I don't understand what you mean by relatively new when you bought it 2 years ago. ...

As for preventing it, the key is to keep your tire properly inflated between 80-100% of the sidewall pressure rating, and to wear it out before 5 years or so.
Hi FBinNY - You are right to challenge me on that: I would not have believed it myself, except that it's that same tire I use on many flips and several of my own bikes - and those do not exhibit any less discoloration from age, UV or ozone exposure. (The sidewalls tend to turn less yellow in time).

Also, I must admit that I don't know how these tires were inflated by the PO.
They're not super high pressure tires, so maybe over inflation was indeed the cause. I think a lot of people just pump tires past 100 without reading.
__________________
- Auchen
auchencrow is offline   Reply With Quote
Old 11-17-10, 11:31 AM   #5
auchencrow 
Senior Member
Thread Starter
 
auchencrow's Avatar
 
Join Date: Apr 2009
Location: Detroit
Bikes:
Posts: 10,330
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Quote:
Originally Posted by canopus View Post
Also once one cord goes, it places more stress on the others around it so that they will fail faster. If you had a puncture in one of those cords in the past sometime then they could eventually lead to that kind failure. Old BMX Snakebelly tires were notorious for it, Firestone car tires were the worst. Haven't seen it to much on quality bicycle tires but pressure is pressure.

Hi canopus - You have cited another real possibility - the prior owner could have traversed across a bed of upholstery tacks for all I know!
... Sort of like the antithesis of "a stitch in time saves nine".

It makes me wonder if its sound to EVER leave tires on a used bike, no matter what the condition.
__________________
- Auchen
auchencrow is offline   Reply With Quote
Old 11-17-10, 12:08 PM   #6
Doohickie 
You gonna eat that?
 
Doohickie's Avatar
 
Join Date: Sep 2008
Location: Fort Worth, Texas Church of Hopeful Uncertainty
Bikes: 1966 Raleigh DL-1 Tourist, 1973 Schwinn Varsity, 1983 Raleigh Marathon, 1994 Nishiki Sport XRS
Posts: 14,460
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
You got two years out of it, right? That's not too bad.
__________________
I stop for people / whose right of way I honor / but not for no one.



Originally Posted by bragi "However, it's never a good idea to overgeneralize."
Doohickie is offline   Reply With Quote
Old 11-17-10, 12:26 PM   #7
auchencrow 
Senior Member
Thread Starter
 
auchencrow's Avatar
 
Join Date: Apr 2009
Location: Detroit
Bikes:
Posts: 10,330
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Quote:
Originally Posted by Doohickie View Post
You got two years out of it, right? That's not too bad.
Hi Doohickie!

"Yeah but" two years sure is not a lot of miles when you have as many bikes as I do!
__________________
- Auchen
auchencrow is offline   Reply With Quote
Old 11-17-10, 12:40 PM   #8
DannoXYZ 
Senior Member
 
DannoXYZ's Avatar
 
Join Date: Jul 2005
Location: Saratoga, CA
Bikes:
Posts: 11,606
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Could have also come from riding on the tyre when it was flat. The sharp rim-edge can damage the casing in a straight-line like that if you have your weight on it for any length of time.
DannoXYZ is offline   Reply With Quote
Old 11-17-10, 12:42 PM   #9
10 Wheels
Galveston County Texas
 
10 Wheels's Avatar
 
Join Date: Nov 2007
Location: In The Wind
Bikes: 2010 Expedition, 03 GTO
Posts: 30,104
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 394 Post(s)
I have had two different tires do that at about 1600 miles.
I think they were just defective tires.
__________________
[SIZE=1][B]What I like about Texas[/B]
http://www.youtube.com/watch?v=PGukLuXzH1E

Set F1re To The Ra1n ( NY Night Rain Ride)
http://www.youtube.com/watch?v=W7jfcWEkSrI
10 Wheels is offline   Reply With Quote
Old 11-17-10, 08:12 PM   #10
Doohickie 
You gonna eat that?
 
Doohickie's Avatar
 
Join Date: Sep 2008
Location: Fort Worth, Texas Church of Hopeful Uncertainty
Bikes: 1966 Raleigh DL-1 Tourist, 1973 Schwinn Varsity, 1983 Raleigh Marathon, 1994 Nishiki Sport XRS
Posts: 14,460
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Quote:
Originally Posted by auchencrow View Post
Hi Doohickie!

"Yeah but" two years sure is not a lot of miles when you have as many bikes as I do!
I know... same here. But still, you got to put off a tire purchase for 2 years.
__________________
I stop for people / whose right of way I honor / but not for no one.



Originally Posted by bragi "However, it's never a good idea to overgeneralize."
Doohickie is offline   Reply With Quote
Old 11-18-10, 01:32 PM   #11
blamp28
Bikaholic
 
blamp28's Avatar
 
Join Date: Dec 2006
Location: Western, Michigan
Bikes: Trek Fuel 90, Giant OCR, Rans Screamer Tandem
Posts: 1,465
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I had the same thing happen to two lower end Michlin tires in one season. They were defective it turns out. That can happen from time in storage as well as miles on the bike.
blamp28 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 11:06 PM.