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@gbj_tester
Or not, as the case may be. You got 4.5mm from Sheldon, and he was wrong. It's too late to ask him how he was so wrong, and because he was right about so much else, we see his error over the difference between ISO and JIS propagated uncritically even though it has been comprehensively debunked by both measurement of the axles and many, many people's experience of actual chainline changes when substituting UN55s for ISO BBs