This probably just comes down to me not knowing the correct terminology (and therefore not finding search results)...
But I noticed my front Normandy Luxe Competition hub was a little rough occasionally. Once it was turning, it'd feel very smooth, but when I'd just start turning it, it would sometimes "catch" and I'd have to apply more force. Again, once spinning, this doesn't happen.
I took it apart (again) to replace the bearings. The cones don't seem very worn, and what I think (?) are the bearing races (the outer wall of the "donut") also seem smooth. However, if I run my finger across the inner "donut ring" (indicated below) it's very sharp and not flush with the surface.
First, is there a name for this ring/lip?
And second, is there anything I can do to smooth it?
I have no idea what the name is for that part but only two things matter: the cup and the cones. If they are smooth and not pitted, then pack up the hubs with grease and ball bearings and ride it; you're good to go.
OK, a few other things might be problematic as well but they are less likely to occur than a cup or a cone going bad. The spoke holes need to be in good shape (they appear to be in the picture) and the axle needs to be in decent shape as well.
That lip has nothing to do with your issue because the bearings do not roll in that area. The part about spinning and catching is due to a bent axle. Lay it on a glass coffee table and roll the axle, do you see a part of it that goes up and down? Replace axle and the it will spin without catching.
Also be sure to adjust the cones so that you have some play in the axle. Undo/back off the cones about 10-15 degrees from perfect smoothness. When you tighten the QR-skewer, the tiny amount that the axle compresses will take up that play so the hub will spin with perfect smoothness.
Thanks for the good info Danno & bikemig...didn't occur to me to check the axle.
Unfortunately, I'm short a glass table. But since the length is short (compared to test a rim, say), I checked the axle on various portions of a granite countertop. Couldn't find anything crooked. I might have to take it to the LBS for a more definite test.