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@Bike_Destroyer
So the difference between ISO and JIS is the angle of the taper? Or is it the size of square section at it's largest point? Does it basically mean that if you put the wrong crank on the axle it will either slide on too far or won't go on enough?
Last night I tried to swap cranks on my 1980 Raleigh. It had the original cranks on and I tried to put a crank from a late 80s Peugeot. The crank wouldn't go any anywhere near as far as the originals. I think the Pug cranks were about 5mm further out. Or could this just be that the chainrings sit in a different position to the arms? They look the same.