Originally Posted by habitus
yes, true. i think that some people are still convinced (wrongly) that sugino is ISO. i still don't get how they could both be JIS and be measurably different.
i think that the most likely answer offered is that the sugino cranks are manufactured to tighter tolerances than many JIS bottom brackets, especially the cheaper shimano ones (un53, 73). also, i suggest that the sugino cranks and bottom bracket are also made specifically to be used with each other, which might mean that their particular fit is more snug.