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  1. #1
    Robosapien substructure's Avatar
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    2 problems, maybe same issue - chain

    The first problem is a noise I'm getting near the BB. It's an unusual sound and it's random. It's a slight - very annoying - clanking noise. I took it to 2 different shops and each time I came home (clankity clank, clankity clank.) Both times the shop guys told me that they thought it was fixed. I had the front and rear derailleurs adjusted and I had the bottom bracket looked at. Still doing it though. And only when I'm out riding and never on a trainer.

    Next thing is that my chain will bang hard against the chain stay when I go over some bumps, tracks or the like.

    Any help will be appreciated. I hate this noise. It's driving me batty.

  2. #2
    ride, paint, ride simplify's Avatar
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    Does this happen in all gears? If it happens only when the chain is on the small chainring in front and one of the smallest cogs in back, maybe your chain is rubbing against the inside of the large chainring. That can definitely be a clanking noise, I've had that happen. If that's what's happening, then you may want to avoid these "crossover" gear combinations and shift to the big ring instead of staying on the small ring and small cogs. It sounds like your chain may not have a lot of tension, if it's slapping the chainstay all the time--this could be a weak derailleur spring--but some chainslap is perfectly normal. That's why we put a protector strip (electrical tape works fine) on that chainstay.

  3. #3
    Robosapien substructure's Avatar
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    Quote Originally Posted by lawkd
    Does this happen in all gears? If it happens only when the chain is on the small chainring in front and one of the smallest cogs in back, maybe your chain is rubbing against the inside of the large chainring. That can definitely be a clanking noise, I've had that happen. If that's what's happening, then you may want to avoid these "crossover" gear combinations and shift to the big ring instead of staying on the small ring and small cogs. It sounds like your chain may not have a lot of tension, if it's slapping the chainstay all the time--this could be a weak derailleur spring--but some chainslap is perfectly normal. That's why we put a protector strip (electrical tape works fine) on that chainstay.
    Yes, it happens in all gears. And for the life of me, I cannot duplicate the noise inside on the trainer.
    It's coming from the bottom bracket area, though (outside while I'm on a great ride).

    Thank you for your response.

  4. #4
    ride, paint, ride simplify's Avatar
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    Any luck resolving this? I had one other thought--do you by any chance use different pedals on the trainer than you do on the road? Or are there any other differences in your setup on the trainer? Sometimes sounds seem to come from the bottom bracket, but they really might be something else. Pedal noise is a lot like that.

  5. #5
    Robosapien substructure's Avatar
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    Quote Originally Posted by lawkd
    Any luck resolving this? I had one other thought--do you by any chance use different pedals on the trainer than you do on the road? Or are there any other differences in your setup on the trainer? Sometimes sounds seem to come from the bottom bracket, but they really might be something else. Pedal noise is a lot like that.
    SPD connectors on my Sidis were clanking around. I glued them in place.

  6. #6
    ride, paint, ride simplify's Avatar
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    Fabulous! Glad to hear it!

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    I have very few ideas on the noise. I do know that bikes can transmit noise along the frame, so it may not necessarily be the bb. Did the lbs pull and reinstall the bb? If not, why not?

    On the next point, you do want to be sure you don't have excess chain slack. Check out the Park tools repair site and google measuring chain length to be sure. It may be worth it. If chain length is fine, slap a lizard skin on the stay.


    ffff
    Quote Originally Posted by substructure
    Next thing is that my chain will bang hard against the chain stay when I go over some bumps, tracks or the like.

    Any help will be appreciated. I hate this noise. It's driving me batty.

  8. #8
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    Quote Originally Posted by substructure
    SPD connectors on my Sidis were clanking around. I glued them in place.
    good news! surprised it was such a loud clank though.

  9. #9
    Robosapien substructure's Avatar
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    Quote Originally Posted by feefifofum
    good news! surprised it was such a loud clank though.
    Well, I still have a slight chain issue. But the most annoying "clicking" was the shoes. The "clanking" is a chain that's slightly too big. I will have this checked soon as well. From what feefifofum stated this could be the problem.

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