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I have a drivetrain buzz that I can't seem to source. It's not a wanting to shift kind of noise, or any problems with lubrication. It's a sort of metallic buzzing, especially in the lowest gearing. I thought it might be pulleys, but I cleaned/regreased them today and it's still doing it. Any suggestions? I want to note that I suspect it is the result of a 10 speed cassette on an 11 speed hub with a spacer; even though I've tried to reseat it, it looks almost out of true when rotating.