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Which bit of a UN55 creaks?
I don't really know, but whenever I'm accelerating or standing up going uphill it makes quite a bit of noise.
Is your shell straight (coaxial threads, faces orthogonal to the axis)?
This is what I assume is the problem - I think it might just be slightly out and stressing the bb (but I have no knowledge of this kind of thing). Is there a hacky way or measuring this?
psb-
Bit stupid suggestion, but I've been caught out by it once before and couldnt figure it out - did you grease the threads when you installed it?
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UN55 should be good for at least 10000 miles and then the bearings will be getting rough and gritty. My first suspicion is a creak is something else; ie not tight enough in the shell, cranks on the tapers, pedals done up tight enough etc.
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Is there a hacky way or measuring this?
There's barely a non-hacky way. It's not something anybody ever measures, they just chase and face and assume (usually more or less correctly) that the tool deflection will be less than the desired tolerances.
boredom
Jonny69
gbj_tester
Which bit of a UN55 creaks?
Is your shell straight (coaxial threads, faces orthogonal to the axis)?