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  1. #1
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    chain suck, new bits

    ok, a serious mechanical question, just kinda of looking for a fresh perspective:
    wifes bike has 105 ft and rear mechs, a sram pc 68 chain, sugino chainrings, 48, 34, 26, and a sunrace freewheel, 7 spd. she keeps getting chain suck when shifting to the granny, which i initially attributed to her lack of shifting prowess, but i tried it, to the same results. i know what your thinking: needs a new chain, or new rings, but this is the bikes first season, with well under 1000 miles, and constant prolink chain flushes...ect ect. the only thing i figure is that the chain is too narrow, or the chainring spacing is off, and so it jams between the granny and the middle ring. oh, friction shifting, and limits look good, if not great. whaddya think? oh, and i have the same set up, more or less, and have no issues, with maybe 2 times the miles.

  2. #2
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    so no one has any thoughts on this? what about a chainring burr? a warped chainring, cummon people, think for me. i cant busy my mind with more esoteric stuff if i have to think about this

  3. #3
    cyclist/gearhead/cycli... moxfyre's Avatar
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    My guess would be the front derailer cage is at a slightly wrong angle. My girlfriend's bike had the same problem and it was very frustrating for her for a while.
    My bikes | Linux and Python stuff | Photo gallery

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  4. #4
    Senior Member grolby's Avatar
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    Well, there's a good website on the problem here: http://fagan.co.za/Bikes/Csuck/.

    I don't expect that a warped chainring is your problem. I've experienced THAT problem, and it mostly led to my chain getting unexpectedly dropped onto the granny; obnoxious, but a different issue entirely. Burrs are a distinct possibility though, and worth investigating.

  5. #5
    Senior Member slim_77's Avatar
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    Burr. Did you try swapping your chain or chainring onto her bike? Since you have an exact match that could help narrow the problem a bit more for you.
    gravity: it's not just a good idea, it's the law.

  6. #6
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    word, all good suggestions. i really like the derailleur angle. its funny to see moxy be nice to me. good show. what took ya so long? thanks kids.

  7. #7
    cyclist/gearhead/cycli... moxfyre's Avatar
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    Quote Originally Posted by ridelugs
    word, all good suggestions. i really like the derailleur angle. its funny to see moxy be nice to me. good show. what took ya so long? thanks kids.
    I didn't realize I was being mean, sorry. I think we just have very different tastes in terms of aesthetics, but let's not open THAT can of worms again
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  8. #8
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    Make sure the mounting bolts for the chain ring are on snug too.

    But sounds like the front derailleur needs a slight clockwise nudge when looking down from the seat.

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