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@Sumo
So I think I've solved the problem of my squealing brake. I think when I sit my 100kg on the bike it causes the rear triangle to flex slightly and move the caliper just enough that the edge touches the rotor. I'm not sure why it didn't happen before but I just tried setting it up so it rubs on the outside pad then when I sit on it there's no more rubbing. Looking at the caliper there's a slight lip on the metal where it looks like it's been worn away and it's perfectly in line with the rotor.
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