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Thread: loose spider

  1. #1
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    loose spider

    i recently put an fsa carbon isis drive compact crankset w/ a 34t chainring on my fixie. it has a carbon spider, which i discovered was actually loose. we were able to tighten it by putting the lockring in a vise, clamping it to the table, and attaching a very very long pipe to the crankarm and turning while i put my full body weight on the center of the crank. it tightened quite a bit, to the point where the vise started rotating, and my friend said it was getting a little hard. we put around 60 n/m of force into it, which is what it says on the back of the lockring. i can ride it well now, but the spider still slips when i jump on the pedals really hard. i really dont think i should tighten it anymore unless i want to risk breaking it. so am i correct to surmise that these cranks are just not meant for fixed gears? or is there something wrong with the crank?
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  2. #2
    A little North of Hell
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    fsa carbon spiders don't like skippin,skiddin,etc.
    [SIGPIC][/SIGPIC]
    XXXI

  3. #3
    spinspinspinspin fatbat's Avatar
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    Quote Originally Posted by trackstar10
    am i correct to surmise that these cranks are just not meant for fixed gears? or is there something wrong with the crank?
    I don't think they had backpressure in mind when they built that crank. Also, with a 34t ring, you're probably running a pretty low gear, which increases the stress on the spider.
    Solution- new crank.
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  4. #4
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    Quote Originally Posted by trackstar10
    so am i correct to surmise that these cranks are just not meant for fixed gears?
    You are incorrect. They are meant specifically for track bikes which are fixed gears.

  5. #5
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    Quote Originally Posted by fatbat
    Also, with a 34t ring, you're probably running a pretty low gear, which increases the stress on the spider.
    INCORRECT.

  6. #6
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    On the upside, you now have a nice carbon fiber paperweight.

  7. #7
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    Quote Originally Posted by BostonFixed
    On the upside, you now have a nice carbon fiber paperweight.
    he might be able to get a replacement he could then then sell to someone who has an actual use for it.

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