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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 05-24-07, 07:34 AM   #1
trackstar10
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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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Old 05-24-07, 07:41 AM   #2
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fsa carbon spiders don't like skippin,skiddin,etc.
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Old 05-24-07, 09:14 AM   #3
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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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Old 05-24-07, 09:17 AM   #4
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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.
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Old 05-24-07, 09:18 AM   #5
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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.
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Old 05-24-07, 09:23 AM   #6
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On the upside, you now have a nice carbon fiber paperweight.
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Old 05-24-07, 09:28 AM   #7
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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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