chainstay rubbing
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  1. #1
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    chainstay rubbing

    Have been riding the same carbon fiber road frame for about 10 years now, with about 80% time on the trainer. Just recently i noticed that the inner chainring has been gouging into the chainstay. I routinely check my frame, adn have never had this happen before. Bad enough to have a 10mm x 2 mm divet in the chainstay. All chainring bolts are tight and the BB feels solid with no extra play. Clearance between the inner ring and stay is about .75 to 1 cm. I see no cracks or obvious evidence of delamination in the CF that might lead to increased frame flex. My question is can CF frames fail , creating more flex and causing these sort of 'subclinical' findings with no visual evidence of anything wrong otherwise? Anybody had similar issues? I plan to take it into the LBS this week, but curious if others have had or seen similar issues. Thanks

  2. #2
    'brifter' is f'ing stupid
    Reputation: cxwrench's Avatar
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    If you're really 2mm into the chainstay I'd recommend very strongly to not ride that bike outside.

    With that out of the way here are a couple of things to think about.

    A properly engineered and built carbon frame basically has an infinite fatigue life. It should never 'get tired' or wear out. That and you say you've inspected the frame and failed to find any cracks or damage makes me think you've got some major problems somewhere in the crank and/or bottom bracket. Or you've had some chain suck somewhere along the line?
    #promechaniclife

  3. #3
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    Quote Originally Posted by cxwrench View Post
    makes me think you've got some major problems somewhere in the crank and/or bottom bracket. Or you've had some chain suck somewhere along the line?
    If the OP really does have 7 mm clearance between the inner ring and chain stay and yet sees this kind of a gouge to the frame, then that suggests a VERY loose crank, chain suck (as you suggested) or possibly somewhere along the line a chunk of stone got between the chain ring and frame and this was a one-time damage issue.
    Last edited by Kerry Irons; 2 Weeks Ago at 08:55 AM.

  4. #4
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    Once you figure out what happened, even if the damage seems quite severe the frame may be salvageable. There are carbon repair shops that do great work out there.

  5. #5
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    Thanks, all. No chain suck that I am aware of, so has to be in the crank/BB. I am not seeing any extra play in the cranks/BB when i mess with it, but that doesn't mean it wont under pressure I would have to assume. And no way is it hitting the road......its staying on the trainer until i can get it in. Id rather fall 3 feet onto a carpet going 0 mph than 3 feet onto concrete going 20mph lol

    Thanks again for the input

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