The Shimano Dura-Ace R9100 Bottom Bracket offers 50% reduction in friction so your cranks will spin with less system drag.
Shimano precisely engineers their highest quality steel ball bearings for this unit and with the seal effectiveness improved, infiltration and corrosion are incredibly unlikely, even with regular bike cleanings during the rainy seasons or during cyclocross.
The Dura-Ace R9100 Bottom Bracket will not fit the older 44mm 16 notch outboard bearing cup tools.
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