Genuine Shimano Ultegra SM-BBR60 Hollowtech II 2 piece bottom bracket assembly includes left and right hand cups, spacers, inner cover, and inner O-rings.
HollowTech II integrated bottom bracket design uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency.
Seals have minimal bearing interface ensuring smooth rolling and increased durability.
Housing width: 68 mm
Anodized bearing shells
Small ball bearings for low weight
Inner bearing cup: aluminium
Inner bearing sleeve: GFRP
Approx weight: 75g