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You CAN fit a ISO crank on a JIS spindle, it’ll just stick out 4 or 5mm more
This is a myth. People assume that because it was on Sheldon Brown, it must be true. It's a pity he didn't live to correct this, because it gets rolled out as fact every time the subject is discussed on any cycling forum, and asserted as an absolute fact by people who have clearly never measured a pile of square taper bottom bracket spindles to see what the difference really is.
Regardless of any JIS/ISO confusion, you should always carefully inspect any square taper assembly, even one which is supposed to be a proper match from the same factory, to ensure that the bolt head doesn't touch the end of the spindle and the crank doesn't touch the runout of the taper at the big end.
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you certainly CAN... but things will get fucked up. this is an ISO crank that has been used on a JIS spindle. the pic shows the correct factory ISO bb - the crank arm is just put on, not tightened...
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gbj_tester
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@Eeyorecore
You CAN fit a ISO crank on a JIS spindle, it’ll just stick out 4 or 5mm more then the bb measurement. So you’ll never find a JIS spindle short enough for that Crankset.
I’ve been running TA cranks on 107 Shimano BBs for years.