Shimano BB-R60 Ultegra/105 Hollowtech II bottom bracket uses a wider bearing placCompatible with all Shimano Hollowtech II chainsets
New model Shimano BBR60 bottom bracket for the Ultegra groupset
HollowTech II integrated bottom bracket uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency
HollowTech II integrated bottom bracket seal design has minimal bearing interface ensuring smooth rolling and increased durability
English or Italian fitting
Excludes fitting toolement and larger axle diameter for increased stiffness and efficiency.