2mm wobble when the rim is laying flat against a pane of glass. No spokes or anything. For example, this was a Campy rim that had nearly a full inch of bend when laid next to a window. When the rim was in an assembled wheel, after it was trued, the spoke tension on one side was next to none in one part.

After the wheel was broken down, there was that nearly a full inch of bend/wobble in the rim. I bent it back using a doorway and my muscles. Got it to within 2mm of wobble when laid against a pane of glass. We aren't talking about 2mm of out of true on a fully assembled wheel here, just how much wobble the raw rim alone has after I bent it back.