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ISO cranks work on JIS axles, but not the best thing, as it could ruin the square taper on the crank. I ran 75s on a shimano axle, 118 I think, without any issue.
JIS cranks must not be assembled on ISO axles, cause they don't let you tighten properly the crank bolt and will ruin the taper and maybe cause accidents.
As far as I know 75s have always been ISO.
What sounds strange to me is running 75s on 103mm axle
Dr.E
Hmmm, 1993 should take note of that, my chainline seems okay though, if its off i can't tell.
I think the older ones are JIS? Or none NJS ones are, i've got some 75's on a JIS and its fine