Given enough use, anything will fit on a JIS stub, no? So that's the way vintage is going, until the universe stops expanding.
Here are some data points taken with a Mitutoyo dial caliper (analog) with no particular calibration history (good enough for cycling):
I found these on an old paper, can't remember when I started down this rabbit hole; within the last couple years I think. I didn't bother to go to two decimal digits, obviously. Maybe I'll continue and finish this one day.