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@kusak
newest 9000 dura-ace crank+bb weights almost the same as the classic track version mentioned here. I think it might be something about stiffness or bearing thing.
Don't forget the external bearings make the bottom bracket slightly wider than 107-109 mm which is most popular in track bikes. And that might cause a problem with chain line. Maybe it's something about the distance between crank and frame? But I don't think that this problem in not to be overcame, especially for Shimano.
Other theories?