just tooling marks from machining the brake track after welding the seam.
same finish on my Mavic EX 721 rims , also black anodized, the color goes away soon ./
My question is could I install caliper brakes?(*) Or this surface will just shred the braking pads?
no the rings are around the edge, not radiating out from the axle center
across the face..
Im running Kool Stop salmon brake pads on all my rim brake bikes .
(*) have no idea since I cannot see the places where you may mount brakes ,
perhaps you can offer up a picture on that ..