I had to remove the Competitions from both of my Gitane TdF's because of the infernal squealing. I was able to reduce it some by installing Mathauser blocks and setting the toe in on them, but I was never able to get rid of it completely. Perhaps it was the other adjustment that Unworthy1 referenced, but it looked like they had good rim contact to me. Other than the squealing though, I found them to be remarkably effective brakes. Much better than any Weinmanns that I have had.