shimano bb-r60 ultegra -105 english thread cups bottom bracket

Hollowtech ii integrated bottom bracket uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency.Features:Hollowtech ii integrated bottom bracket seal design has minimal bearing interface ensuring smooth rolling and increased durabilityUse tlfc37 or tlfc25 in conjunction with tlfc36 adaptor tool for installation and removalFor use with Ultegra - 105 - cx70 chainwheels