Shimano 105/Ultegra 11sp BB-R60 BB Cups

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
Use TLFC37 or TLFC25 in conjunction with TLFC36 adaptor tool for installation and removal