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Damaged my brand new TCR Advanced frame by chain suck

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  • December 2, 2019 at 7:56 am #30311
    theraPi

    Hi everyone,

    I follow the road.cc for quite some time, but registered just now, since I experienced a shocking revelation yesterday while inspecting my FD.

     

    On the very second ride with my new TCR Advanced I dropped the chain on a slight incline. It’s my first carbon bike and I did not give it a secong thought at that point. I also always ease on the pedals when switching into the small ring, since I want to avoid exactly that. However, it seems to have left a pretty nasty damage on the chainstay. 

    It looks (at leas I hope) like mostly paint damage, except for the lower part. I’d like to hear your more experienced opinions, before I decide what to do next.

    https://i.imgur.com/hBZDpRI.jpg

    https://i.imgur.com/4HEuwvH.jpg

    https://i.imgur.com/Sw94Hez.jpg

    https://i.imgur.com/m8aBUBE.jpg

     

    Thanks everyone,

    Cheers!

     

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  • December 3, 2019 at 11:34 pm #953357
    0
    longassballs

    I don’t care what anyone else
    I don’t care what anyone else says – I’d be taking it back to the shop for replacement or refund. For that to happen on a second ride is unacceptable and the fault of whoever set the bike up

    December 3, 2019 at 4:13 pm #953355
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    Biggie Smells

    As folk have previously

    As folk have previously posted, that’s just superficial damage and it doesn’t need to be looked at for structural integrity problems. You have a few aesthetic repair options – buy some wet and dry sandpaper from Halfords and sand the area down so there are no more flakes of paint, then get some clear nail varnish and give it a few coats to seal it in. You could also just buy a matte black chainstay protector, cut a section of it and stick it over the offending area after sanding off the flakes (don’t pick at the flakes).

    December 3, 2019 at 3:32 pm #953353
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    Mybike

    You should always use a chain
    You should always use a chain catcher

    December 3, 2019 at 2:12 pm #953351
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    alotronic
    theraPi wrote:
    Bobbinogs wrote:
    yeah, I am not convinced that is chain suck, probably more a case of either the setup not being right or just bad luck (hitting a bump in the road mid-shift). 

    As above, get the damage checked out (there are quite a few good CF repairers out there now) although it does look cosmetic.  Might also be worth getting a chain catcher fitted as part of the front shifter check/setup afterwards (the Token ones work well and cost as little as a tenner).

     

    Well, what qualifies as chain suck?

    I definitelly dropped the chain first, and by the inertia made approximately half a turn on the cranks. It was 90rpm or so… I assume the small ring teeth picked the dropped chain and  puled it upwards. I dropped the chain on my other alloy bike couple of times, but te chain never got pulled up like that.

     

    There’s more vertical material on deep section carbon chainstay than on aluminium, so there will be more visible damage = more area to damage. FWIW less worried about damage in this part of the frame than say, headtube, because you are less likely to hurt yourself if a chainstay breaks! A bit of wear and tear in this area is unvoidable though I can see how doing it so early on a new frame will be a blow!

    December 2, 2019 at 4:01 pm #953349
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    theraPi
    Bobbinogs wrote:
    yeah, I am not convinced that is chain suck, probably more a case of either the setup not being right or just bad luck (hitting a bump in the road mid-shift). 

    As above, get the damage checked out (there are quite a few good CF repairers out there now) although it does look cosmetic.  Might also be worth getting a chain catcher fitted as part of the front shifter check/setup afterwards (the Token ones work well and cost as little as a tenner).

     

    Well, what qualifies as chain suck?

    I definitelly dropped the chain first, and by the inertia made approximately half a turn on the cranks. It was 90rpm or so… I assume the small ring teeth picked the dropped chain and  puled it upwards. I dropped the chain on my other alloy bike couple of times, but te chain never got pulled up like that.

    December 2, 2019 at 3:55 pm #953347
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    AfterPeak

    Looking at the width (top to

    Looking at the width (top to bottom) that looks too long to be a chain but there are two/three strips  down that look about chain link width apart. Almost looks like the damage has been done upwards not downwards. No chance it was your shoe/heel from a missed clip in or something else more random?

     

    Also agree with others that it doesnt look like any damage to the carbon. You get chips that deep from inside the chainstay where wheels might rub or under the bridge of the seatstay from stuck stones but as you are not sure how the damage was done best ask the shop at the very least.

    December 2, 2019 at 3:30 pm #953345
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    bobbinogs

    yeah, I am not convinced that

    yeah, I am not convinced that is chain suck, probably more a case of either the setup not being right or just bad luck (hitting a bump in the road mid-shift). 

    As above, get the damage checked out (there are quite a few good CF repairers out there now) although it does look cosmetic.  Might also be worth getting a chain catcher fitted as part of the front shifter check/setup afterwards (the Token ones work well and cost as little as a tenner).

    December 2, 2019 at 2:32 pm #953343
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    Judge dreadful

    I think that’s just paint

    I think that’s just paint damage, personally. If the CF is damaged, you normally see loose threads sicking out. But it’s better to be safe than sorry, and a scan of the frame might put fears at rest.

    December 2, 2019 at 1:59 pm #953341
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    The _Kaner

    I’d get it expertly checked.
    I’d get it expertly checked.
    2nd ride and a shipped chain.
    Might want to ask the bike shop, I’m presuming it was from a bike shop, to check the set up and see why the chain was able to come off the chain wheel.
    Looks like the indexing/ front derrailleur may be out a tad.

    December 2, 2019 at 1:27 pm #953339
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    theraPi
    peted76 wrote:
    Wow that’s a bit of a knightmare, that’s a hell of a crunch. You should check your chain and try and find out why you experienced chain suck. I don’t think that I can remember ever experiencing it.

    I reckon there’ll be no structural damage done there, it’s a very tough part of the frame, best you can do is put some clear coat over it. 

     

     

     

     

    Hi, thanks for the reply.

    It happened on a slight uphill section, when I switched into the smaller ring. The chain dropped, and I assume got caught by the ring in the process…

     

    I’m a bit relieved to hear that it is “probably” fine. However, I’m tempted to take it somwhere for inspection.

    December 2, 2019 at 1:13 pm #953337
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    Dingaling

    Chain suck is something I

    Chain suck is something I have experienced several times over many years and it was usually associated with a mountain bike triple drive train.  I think it is more likely when a chain is worn and doesn’t drop off the bottom of the chain ring and gets carried up and “crunch”. One recommended way of treating damage to a carbon surface is put super glue on it. After that I would put a few layers of reinforced tape on the chain stay to protect it against the next time it happens.

    December 2, 2019 at 1:01 pm #953335
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    peted76

    Wow that’s a bit of a

    Wow that’s a bit of a knightmare, that’s a hell of a crunch. You should check your chain and try and find out why you experienced chain suck. I don’t think that I can remember ever experiencing it.

    I reckon there’ll be no structural damage done there, it’s a very tough part of the frame, best you can do is put some clear coat over it. 

     

     

     

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