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Thread: Today's mishap

  1. #1
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    Today's mishap

    Pedaling up a short hill, not particularly hard, a click and a snap.

    Looked down and saw what you see below. Derailleur hanger snapped, cage and pulley broken in two, chain wrapped behind the cassette. Not sure what would have caused this, I haven't adjusted my hi-lo screws, maybe my putting the non-spec cassette was stressing the hanger in some way, or maybe it was just a bad derailleur hanger?

    Thankfully happened in the first couple of miles of the daily ride and I was with one other so he went back to get his car. Yesterday I was in the middle of nowhere doing some decent climbing so happy it didn't happen then! Funnily enough I had the Ultegra 6870gs derailleur and sent it back to the vendor yesterday morning, now I need to order it again.

    photo 1.jpgphoto 2.jpgphoto 3.jpg

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    Chain too short?

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    Bridge Burner RollCNY's Avatar
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    My bikes weep for your bike.

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    What gear ratio was on the new cassette? Looks like you may have put on a cassette that reached past the limit of the RD or chain length. Sorry about the bike!

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    Senior Member Ricanfred's Avatar
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    Sorry to see that man!
    2011 Trek 2.3

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    yeah, the chain was the right length, but the ratio was beyond spec (11-32 vs. spec of 28t max). Lots of people running same combo but guess it varies from bike to bike! I wouldn't have thought that the hanger would break as a result but I suppose I should be happy it did instead of the frame.

    I've (re) ordered the 6870gs derailleur, going to try and source a new 9070 pulley assembly just so that I have it.

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    Maybe overtime the tension on the 32 caused it to fail.

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    OUCH!

    Glad you're OK.

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    bt
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    Why people over clock their derailurs is beyond me. Yet there will always be people telling them it's ok to do it.

    ya get what ya get

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    pan y agua merlinextraligh's Avatar
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    Quote Originally Posted by robbyville View Post
    Pedaling up a short hill, not particularly hard, a click and a snap.

    Looked down and saw what you see below. Derailleur hanger snapped, cage and pulley broken in two, chain wrapped behind the cassette. Not sure what would have caused this, I haven't adjusted my hi-lo screws, maybe my putting the non-spec cassette was stressing the hanger in some way, or maybe it was just a bad derailleur hanger?
    Looks like the chain overshifted into the spokes, caught up there, wrapped around and pulled the derailleur hanger off.

    Highly unlikely that the derailleur hanger failed to cause this.

    It's likely that your derailleur hanger got bent just a bit, thus throwing the adjustment of the limit screws off just enough. Laying the bike down on the derailleur side, falling over at the conenvience store, banging the derailleur when your moving the bike around, in and out of cars, can all do this.

    It's also possible the limit screw was off just a bit for some time, and you'd been living on the edge. Then one time you shift hard enough to pull just enough cable to make it ride over.
    You could fall off a cliff and die.
    You could get lost and die.
    You could hit a tree and die.
    OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.

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    Quote Originally Posted by bt View Post
    Why people over clock their derailurs is beyond me. Yet there will always be people telling them it's ok to do it.
    Well... if you need to go onto the 32, probably should be on the small chainring which wouldn't put that much stress to the derailleur. Liking merlinextraligh's explanation.

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    Quote Originally Posted by merlinextraligh View Post
    Looks like the chain overshifted into the spokes, caught up there, wrapped around and pulled the derailleur hanger off.

    Highly unlikely that the derailleur hanger failed to cause this.

    It's likely that your derailleur hanger got bent just a bit, thus throwing the adjustment of the limit screws off just enough. Laying the bike down on the derailleur side, falling over at the conenvience store, banging the derailleur when your moving the bike around, in and out of cars, can all do this.

    It's also possible the limit screw was off just a bit for some time, and you'd been living on the edge. Then one time you shift hard enough to pull just enough cable to make it ride over.
    yeah you're probably right. Like I said I hadn't changed the hi-lo and it's been adjusted/working properly for over a year... But now that you mention it, the bike did fall in my garage the other day.

    Quote Originally Posted by zymphad View Post
    Well... if you need to go onto the 32, probably should be on the small chainring which wouldn't put that much stress to the derailleur. Liking merlinextraligh's explanation.
    I was in the small chainring, also liking it (well as much as one can like an explanation on how a $500 derailleur broke ). Just toodling around recovering from yesterday's climb fest

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    Quote Originally Posted by bt View Post
    Why people over clock their derailurs is beyond me. Yet there will always be people telling them it's ok to do it.

    ya get what ya get
    That's true, but ya don't have to throw it in our faces

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    rugged individualist wphamilton's Avatar
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    It's OK to overclock the derailleur ... generally speaking, if it doesn't get too tight ...

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    bt
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    Quote Originally Posted by robbyville View Post
    That's true, but ya don't have to throw it in our faces
    not trying to rub it in, just in past threads there's never a shortage of people spouting it's ok to do and their mothers brothers sisters friends and uncles all do it with no downside.

    there's a reason for the limits....

    whatever

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    Quote Originally Posted by bt View Post
    not trying to rub it in, just in past threads there's never a shortage of people spouting it's ok to do and their mothers brothers sisters friends and uncles all do it with no downside.

    there's a reason for the limits....

    whatever
    yup I know what you mean. I certainly understand and accept the consequences of my tinkering! I enjoy riding my bike as much as I can but I like to goof around with it just as much.

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    pan y agua merlinextraligh's Avatar
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    Quote Originally Posted by wphamilton View Post
    It's OK to overclock the derailleur ... generally speaking, if it doesn't get too tight ...
    Agreed. Shimano is conservative in what they spec. For them to say a combination is OK they have to know it will shift flawlessly on pretty much any bike out there.

    Assuming that the chain was sized correctly for the larger cassette, I doubt that was a problem. If the chain was sized for the 28 tooth cassette and was just long enough, then putting it in the big/big combination could have done this.
    You could fall off a cliff and die.
    You could get lost and die.
    You could hit a tree and die.
    OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.

  18. #18
    Farmer tan f4rrest's Avatar
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    Um, maybe you broke it in this thread where you had disassembled and hacked it.

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  20. #20
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    I thought of that too, but can't see how. Spring was in and out, I used the same tension spot... Don't get me wrong, it wouldn't surprise me if something I did was the cause I've certainly screwed up enough mechanical things in my past but I don't know what this would be!

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