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Chain damage – cause?

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  • July 2, 2014 at 12:11 am #21811
    srchar

    While cleaning my chain today, I noticed the damage in the attached pic. I’m at a loss to explain how it happened; I haven’t seen anything like it in 20 years of maintaining my own bikes. Does anyone have any ideas? ~X(

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Viewing 6 replies - 1 through 6 (of 6 total)
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  • July 7, 2014 at 10:16 am #801831
    0
    Charliegr555

    MKultra wrote:It’s possible

    MKultra wrote:
    It’s possible you have accidentally hit the front shifter for the front mech with the bike stationary and the spring pressure has trapped the chain between the teeth and the cage and bent it. The pressure from that can have a good go at popping the side plate off the pin, I have also seen that kind of damage done when people have over done trying to ease a stiff link before now.

    Having said that it’s not unknown to get a chain trapped on a tooth and split the link they way the others have suggested.

    It could be your mech like mkultra said
    My limits where a bit off and I did similar damage while riding when It caught on my front mech as I shifted up on the rear

    July 2, 2014 at 1:07 pm #801829
    0
    The _Kaner

    Sabotage? Excessive life
    Sabotage? Excessive life insurance policy payout…?
    😐 😕

    July 2, 2014 at 10:52 am #801827
    0
    MKultra

    It’s possible you have
    It’s possible you have accidentally hit the front shifter for the front mech with the bike stationary and the spring pressure has trapped the chain between the teeth and the cage and bent it. The pressure from that can have a good go at popping the side plate off the pin, I have also seen that kind of damage done when people have over done trying to ease a stiff link before now.

    Having said that it’s not unknown to get a chain trapped on a tooth and split the link they way the others have suggested.

    July 2, 2014 at 10:32 am #801825
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    srchar

    The damaged chain has around
    The damaged chain has around 2,250km on it, in reasonably dry conditions, and was regularly cleaned and lubed – it measures 132.4mm across six rollers, so just on the verge of exceeding Campag’s wear spec. Sprockets and chain rings have 4,000km on them. I replaced the chain as soon as I saw the damage and there’s no skipping.

    The chain had been off for degreasing before I spotted the problem, so it’s possible that I refitted it the other way round, i.e. the damage could have occurred on the inside.

    Thanks for the advice and possible causes, I had no idea that a tooth can get between the inner and outer plates of the chain. I assume this happens when changing gear while mashing the pedals?

    July 2, 2014 at 9:57 am #801823
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    bikebot

    As above, but with the damage
    As above, but with the damage on the outside I’d say that happened on the chainset rather than the cassette.

    July 2, 2014 at 6:46 am #801821
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    CXR94Di2

    It looks like as the chain
    It looks like as the chain traverses the cassette one of the teeth has got in between the plates, causing the above damage

    Question would be how old is the chain and drive train?

    Change the chain immediately and check the teeth thoroughly and replace if showing signs of wear or bent

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