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Carbon frame damaged by chain jam

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  • March 13, 2016 at 2:48 am #25479
    cyor

    Dear all,

                    I had a pretty bad chain jam after chain drop (when shifting from large to small chainring).  I stopped immediately when I sensed the chain jam but the chain still stuck between the drivetrain and small chainring.  Took a while (and force) to remove the stuck chain, and left some damage to the frame near bottom bracket.

     

     

    https://flic.kr/p/F5k7Me 

     

    https://flic.kr/p/F33dgh

     

                      Thought no structural damage by my layman’s eyes.  Could anyone with experience share your views, please?

     

    Regards,

    Cy

     

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Viewing 11 replies - 1 through 11 (of 11 total)
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  • October 17, 2016 at 8:45 am #868207
    0
    SteUK

    Hi,

    Hi,

    Sorry to dig up an old thread. Just wondered what your outcome was? Just suffered very similar damage myself 🙁

    Thanks!

    March 14, 2016 at 2:57 pm #868205
    0
    DonDrum

    Take great care with cracks,

    Take great care with cracks, or suspected, cracks on carbon frames. It’s not enough  to just blithely cover up with touch up paint, or nail varnish (the solvent in which may make the problem worse).

    These are thin-walled carbon tubes, and impact damage can be hard to assess unless you know what you’re doing. Take great care of your frame to prevent damage and treat any suspect areas with great respect.

    You need to carefully remove the paint around the suspected area (don’t use any old rough grit emery – 240 – 350 grit at least ), check the gel coat and look carefully for damage in the carbon weave. If you still suspect a crack, or impact damage, take to to a specialist who can carry out crack detecteion to determine the extent, and depth, of the damage. Be prepared to be told it’s not economically repairable – it’s not easily repaired like metal frames.

    You don’t cover it up and carry on – a catastrophic failure of part of your frame or forks could lead to a disatrous accident

    March 14, 2016 at 1:30 pm #868203
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    FMOAB

    Oh and while you are in the

    Oh and while you are in the shop, get yourself a chain catcher for that extra peace of mind.

    March 14, 2016 at 1:24 pm #868201
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    FMOAB

    Nixter may sound like a nippy

    Nixter may sound like a nippy sweetie, but he’s right.

     If you are so concerned that you were moved to register and ask for advice for the first time, best to get a pro’s advice.

    I stand by the nail varnish tip for cosmetic  damage though!

    March 14, 2016 at 1:15 pm #868199
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    Nixster

    cyor wrote:

    cyor wrote:
    Thanks all, if the damage is cosmetic and not structural, I will just put on a bit touch-up paint. Can someone assure me about this ?

    Sure I could, after all you have no idea who I am, or I you, there is no contract between us and therefore no liability should your bike fall apart at high speed and hurt you.  Any damage to my reputation (such as it is) can be simply resolved by changing my user name (although I’m sort of attached to it, sentimentally).  So if you want my or anyone else’s worthless assurance based on a couple of low res photos on a forum, sure you can have it *.

    Or you could take it to a real-life person who has some carbon expertise and a related business and get their opinion, which will not be expensive but will actually be worth something.  Your choice, obviously but if you weren’t worried, even slightly, then why did you put the post up in the first place?

    If it is cosmetic then putting paint on it would be just dandy.  If…

     

    *not really yes

    March 14, 2016 at 1:05 pm #868197
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    FMOAB

    It’s hard to tell from the

    It’s hard to tell from the photographs, but it doesn’t look too bad. It looks like the paint has been gouged off but the frame is generally unaffected.

    Don’t waste money on matching paint.  A quick visit to Superdrug or Tesco etc will provide you with a nice matt black nail varnish, along with its own brush.  Probably tougher than most paints and available for about £1.00.  Take your time and build up the layers.  Ask your wife/girlfriend/goth partner if you need any advice on the last part.yes

    March 14, 2016 at 11:59 am #868195
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    southseabythesea

    I rode the Paris Roubaix with

    I rode the Paris Roubaix with an existing (10mm) crack in my carbon forks. The crack wasn’t caused a structural problem so it was fine, and still is a year on.

    March 13, 2016 at 11:47 pm #868193
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    cyor

    Thanks all, if the damage is
    Thanks all, if the damage is cosmetic and not structural, I will just put on a bit touch-up paint. Can someone assure me about this ?

    March 13, 2016 at 9:50 pm #868191
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    DoctorCrankenstein

    Its not the worst I’ve seen,

    Its not the worst I’ve seen, to avoid any excess damage if this ever happens again. Its best to remove or loosen off the cranks, then pull the chain out and torque the cranks back up 🙂

    March 13, 2016 at 9:01 pm #868189
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    wycombewheeler

    If you are worried get it to
    If you are worried get it to carbon bike repair in Dorking or other bike repairers. I expect a bit of resin to the fill any gouges will be all it needs. They fixed my frame after the mech hanger snapped and dropped the rear mech onto the wheel resulting in 2 significant cracks on the seat stay.

    Having looked at the photos I would definitely be looking for a repair if it was my bike.

    March 13, 2016 at 7:12 pm #868187
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    pablo

    You need to take the crank of

    You need to take the crank of to really get a good look.  It looks like FSA an Crank?  10mm allen key should get it off in 30 seconds.  If your lucky it’s just paint.  

    How many miles have you got on those chainrings?  The outers look interesting or it could be just the angle.  

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