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Old 12-16-08, 06:20 PM
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tatfiend 
Gear Hub fan
 
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It sounds like the spindle failed which was not clear to me from your original post. Is this a DA crankset with the spindle integral with one arm? When I wrote of aluminum fatigue I was thinking more of a crank arm failure due to fatigue. Except for Ti spindles that was the common failure mode on older forged aluminum cranksets with solid square taper spindles.

You are right about disassembly being a PITA as your failure point would not be visible w/o doing so. I would also think that repeated disassembly/reassembly to inspect that area would be as likely to cause problems than prevent them.

Contact Shimano about the failure and ship the parts to them to examine if they ask you to. A metallurgist there could determine the cause of failure probably. You might end up with a additional replacment crankset for free.
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