Paul M. Hobson wrote:
> http://www.flickr.com/photos/p_myron_h/2480606432/sizes/l/
>
> You'll see a silver Velocity Aerohead rim. According to the builder,
> the rim was stress relieved (JB's method) and tensioned to 100 - 110
> kgf. On both sides of each spoke hole, the aluminum appears to be under
> significant stress by the discoloration (lighter color).
>
> Capturing this with a photograph was tough as the lighting has to be
> just right to notice it even with the wheel in front of you. In the
> photo, you can only see it at the left and middle holes, but this is
> happening at all 32 holes.
>
>
> Is this normal? Scary? Immediately dangerous? To me, it seems to
> indicate that there's a bit too much tension in the spokes. But I'm
> definitely among the uninitiated when it comes to wheel building -- all
> of my rims up to this point have been anodized black, which might be
> hiding this from me.
>
> FWIW, the wheel has taken a good bit of abuse already and still quite
true.
>
> Thanks,
> \\paul
what you're looking at is deformation caused by the spoke nipple head.
spoke nipples vary slightly in profile and size from manufacturer to
manufacturer, model to model, and clearly whatever you have isn't an
exact match for the rim drilling.
that said however, the cracks in the anodizing that you can see [that's
what you're looking at] are oriented perpendicular to the rim's
traditional axial rim cracking mode and are therefore not a problem.
just ride until the braking surfaces wear out.
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