I think this indicates that the spoke tension is causing the rim to
deform slightly at the spoke locations. I don't necessarily view that
as a problem, though; it certainly does not seem to be causing any
difficulties. I've noticed this type of wear pattern a number of
times, and it does not seem to be associable with any pattern of
failure.

I think it's due to spoke tension, too, because the wavy pattern is apparent
to a much higher degree on my non-drive-side than on the drive side.

Thanks for the testing and hard data.

--
Phil, Squid-in-Training