Originally Posted by Sixty Fiver

My Maxy has a Sugino bb and spindle to match... do not have the measurement on this as it was nicely fitted to my bike and had no reason to check the width or taper.

If you fit an ISO crank to a JIS spindle it will sit 4.5 mm farther out than it would on an ISO spindle of the same length while fitting a JIS crank on an ISo spindle will put it 4.5 mm closer in than if it was installed on the same length JIS spindle.

Mixing cranks and spindles does not usually cause any problem although fitting a JIS to an ISO spindle wil cause issues if the crank is removed repeatedly to service the bottom bracket... with sealed cartridge bb's this is not a problem as the service intervals can be years and many thousands and thousands of miles.