Originally Posted by Makoa
Sounds like a seam or blip to me. I have a Mavic x-517 rim that does this. I'm not sure if that is an inexpensive rim, but it is the one that came attached to my XTR hub.
I'm surprised you'd be able to feel the seam on the brake surface of an X517, those seams are welded and ground smooth at the factory, not pinned seams. I've got two wheelsets with X517's, if not for the visible seam on the inner portion of the rim, I'd not be able to tell a seam is there at all. I'm not doubting you, I'm just saying it's surprising it would be noticeable on those particular rims-