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  1. #1
    Senior Member auchencrow's Avatar
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    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

  2. #2
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    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.
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  3. #3
    Senior Member canopus's Avatar
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    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.
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  4. #4
    Senior Member auchencrow's Avatar
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    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

  5. #5
    Senior Member auchencrow's Avatar
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    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

  6. #6
    You gonna eat that? Doohickie's Avatar
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    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."

  7. #7
    Senior Member auchencrow's Avatar
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    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

  8. #8
    Senior Member DannoXYZ's Avatar
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    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.

  9. #9
    Galveston County Texas 10 Wheels's Avatar
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    I have had two different tires do that at about 1600 miles.
    I think they were just defective tires.
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  10. #10
    You gonna eat that? Doohickie's Avatar
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    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."

  11. #11
    Bikaholic blamp28's Avatar
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    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.
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