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  1. #1
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    Why does my chain keep braking?

    I bought a Cannondale and rode it for about 150 miles without any problem, and then switched over the SRAM group to my Blue. After the swap, the bike rides for about a mile or two and then suddenly my chain breaks. This has happened about three times and I have tried all sorts of remedies and none of them seem to work. It seems to happen when I put stress on the chain, such as going uphill or pedaling harder. I was just wondering if any one knew what may cause this or have had this problem?
    Thanks

  2. #2
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    I would guess the chain is defective.
    2000 Montague CX, I do not recommend it, but still ride it.
    Strida 3, I recommend it for rides < 10mi wo steep hills.
    2006 Rowbike 720 Sport, I recommend it as an exercise bike.
    1996 Birdy, Recommend.
    Wieleder CARiBIKE (folding), decent frame.

  3. #3
    Senior Member
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    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
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    A defective chain may break once, but the odds of a defective chain causing multiple breaks are extremely low.

    need to know more.

    Is it a Sram or other brand chain?
    Is it breaking at the same or different places?
    Are you closing it with a new connector link, or the same one, or simply using a chain tool?
    Are plates cracking, twisting, or falling off the end of the pin on one side, then bending open under load?
    Did you correctly measure the chain so it clears the large/large combination plus at least one inch?

    Even without seeing your answers, I suspect your problem is related to how you're closing the chain, and that shifting is forcing the plates over the ends of the pin.
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  4. #4
    Mechanic/Tourist
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    Agreed. The first suspect would be incorrect installation. The odds of a chain failing that drastically that many times is nil. Unless you have proper tools and detailed instructions that you are clear about I would have a shop install it.

  5. #5
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    Have you cleaned your chain with anything unusual? I had several sideplates crack on a chain just from the tension caused by the pins when I took it in from the snow and cleaned it with oven cleaner.

  6. #6
    Senior Member Shimagnolo's Avatar
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    I have been using only SRAM chains for some years now.
    I've never has the slightest problem with them.

  7. #7
    Fred-ish rogerstg's Avatar
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    Quote Originally Posted by geo8rge View Post
    I would guess the chain is defective.
    +1
    I had this happen with a Sram 9s; 3 breaks within 300 miles - new chain solved the problem. FWIW, it's the only chain breakage I've had on modern equipment in the last decade.

  8. #8
    Bikaholic blamp28's Avatar
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    Quote Originally Posted by rogerstg View Post
    +1
    I had this happen with a Sram 9s; 3 breaks within 300 miles - new chain solved the problem. FWIW, it's the only chain breakage I've had on modern equipment in the last decade.
    I had exactly the same experience last summer with my son's race bike. Must have been a bad batch.

  9. #9
    cab horn
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    The Op swapped his chain to his new bike. He either

    1) Failed to use a new 10s powerlock (assuming it's 10s)
    2) Repinned the chain (you can't do this)
    3) Chain failure is a coincidental to swapping it and it is masking a sever wear issue
    4) OP does not know how to shift properly coupled with any combination of the above
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

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