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  1. #1
    Major Major somebodies's Avatar
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    chain loose...sorta, sometimes

    I am trying to figure out what causes this. Basically, I get my chain tight, rotate the wheel a bit, its loose, go further, ah, its tight again! I assume this is because the drivetrain is misaligned? Any thoughts?
    he's getting rather old but he's a good mouse

  2. #2
    Senior Member 3niktac's Avatar
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    Look at the section called "Chain Tension" at
    http://sheldonbrown.com/fixed-conversion.html. It sounds like your chainring is not centered.

    C

  3. #3
    Slow in traffic Paul And Pista's Avatar
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    It's probably either an out-of-round chainring (don't worry, it happens to everybody sometime) or insanity. The former shouldn't be a big deal and you could get a nicer ring, if you'd like, but the latter you should definitely have checked out.

  4. #4
    King Among Runaways hyperRevue's Avatar
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    yeah, it definitely sounds like just an untrue chainring.
    pretty common and nothing you can really do about it.
    either deal with it or buy a new/nicer one.

  5. #5
    Radio Bemba 00.0 EnLaCalle's Avatar
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    I have never seen a drive train that does not do this to some extent, there are greater and lesser degrees of loose to tight. Centering the ring will help, but not, I think, eradicate the problem completely. Actually, I don't really consider it a "problem". That's just how it is. Don't worry. It's okay. Just make sure the chain doesn't bind too much on the tight spots or get too loose on the loose spot.

  6. #6
    downtube shifter Jose R's Avatar
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    From my understanding, you rotate the ring until you find the most nuetral revolution of the cranks. But, it is not something you will completely eliminate, as ELC has noted. I just live with it.

    Also, I have been told that the Shimano D/A track rings are the truest. Having better tolerances than the Suginos I use. But, they cost $$$.

  7. #7
    Major Major somebodies's Avatar
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    Yeah, its a fairly new FSA. I tried the chainring centering thing(htanks for the link 3niktac), seems that takes some getting used to. I can probably learn to live with it...
    he's getting rather old but he's a good mouse

  8. #8
    Patrick Barber weed eater's Avatar
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    hey somebodies. the p. floyd quote in your sig cracked me up...it took me a minute to dust off where i'd heard that line, and then i "got it"...very nice.

    those FSAs are like sheets of metal...so it seems weird it'd be out of round already. i have one too, and the Sheldon centering technique, while not perfect, helped quite a bit.

  9. #9
    Major Major somebodies's Avatar
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    Zebrakenko (nishiki knock-off) fixed. Its all broke though. Now, some other old, unidentified japanese frame, freshly spray-painted black(kinda hot). Puch, ss...or is that fffda7th's?
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    I don't think I was insane before I discovered this "problem" but its driving me nuts. How oh how can it be?!
    he's getting rather old but he's a good mouse

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