While braking on my rear wheel I get a thud sound which apparently is coming from the rim joint. When looking at it in a truing stand it's like the wheel goes slightly out of true at that point maybe 2mm. The drive side bumps out while the non drive side goes in. I tried sanding it down but it's still there. I saw some other posts saying that it will even out with use, or use a file to flatten it. But what about the side that goes inward?
Any help appreciated. It is a velocity escape rim.