Shimano Ultegra 6800 SM-BBR60 Bottom Bracket. The new design reduces rotational friction by 50% due to advancements in Shimano’s sealing technologies.
• Hollowtech 2: Optimum balance of lightweight and rigidity
• Outboard bearings provide additional stability
• 14g lighter and 50% less friction than BB6700
• TL-FC25 Installation adaptor included
• 77 grams
• English thread