Outside positioned bearings for better weight distribution and more stability. Bottom bracket has smaller, bearings than current model for lightweight. New improved sealing ensures 50% less drag.
https://jormabike.com/gb/bottom-brackets/bottom-bracket-cups-shimano-sm-bb9100b-dura-ace-00145579_47107.html47107BOTTOM BRACKET CUPS SHIMANO SM-BB9100B DURA-ACEhttps://jormabike.com/803186-home_default/bottom-bracket-cups-shimano-sm-bb9100b-dura-ace.jpg45instockShimano4545002022-03-24T08:36:30+0100/Components and mechanical/Components and mechanical/Transmission/Components and mechanical/Transmission/Bottom brackets
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