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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 08-21-09, 09:51 AM   #1
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Cranks coming loose?? HELP

So i have searched around a little bit and spent some time removing and reinstalling my cranks and bottom bracket.

The frame is a Soma Rush and the cranks are Sugino and the sprocket is Sugino messenger. Everytime i ride, the cranks will come loose and if i rode far enough, would probably come all the way off. I have to bring the allen wrench with me if im riding more than a mile cause they become loose fairly quick. I have tried a little bit of locktite and stuff but it doesnt seem to work.

Any ideas???? Any replies are greatly appreciated. Thanks in advance.

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Old 08-21-09, 09:53 AM   #2
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Probably need new cranks. Once they come loose, the tapers will get marred/deformed and not seat properly, hence the tendency to continue to loosen up.
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Old 08-21-09, 10:12 AM   #3
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What taper is your spindle? How old are your cranks? Chainring type is irrelevant for this issue, but remember, installing and removing a square taper crank frequently will enlarge the hole ever so slightly.

As far as spindles, A JIS taper spindle will fit an ISO crank arm, but sit about 4.5mm out. Conversely, an ISO taper spindle with a JIS crankarm will sit 4.5mm closer, and sometimes the taper will never allow you to fully tighten the crank arm before the bolt bottoms out.

If you're using messenger crank arms, those are JIS taper. Make sure you don't have an ISO taper spindle in your current bb.
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