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@gbj_tester
The Miche BB doesn't have a defined chainline, the whole thing can be freely moved from side to side.
That the chainline is different doesn't tell us that the taper is different, since chainline can be different for identical axle lengths according to whether the axle is symmetrically disposed.
Also, of course, if you actually wanted a predictable chain line you wouldn't rely for axial positioning of the ring on a tapered axle, since the final assembly dimensions are highly dependent on interface lubrication and bolt tension, not to mention the high multiplier between diameter tolerance and axial positioning accuracy. In short, square taper is outdated shit.