The Shimano Ultegra R8000 components feature the technology of the Dura-Ace R9000 components, Shadow rear derailleur technology, a new front derailleur mechanism, a lighter crankset and a wide range of gear ratios.
Original Shimano Ultegra bottom bracket, SM-BBR60, for Hollowtech II road bike cranksets, BSA thread, 68 mm installation width