Shimano Ultegra 6600 Hollowtech II Bottom Bracket Cups | BB-6600
Shimano brakes, gears, components and cycling accessories incorporate more than 45 years of cycling vigour built into each design; their experience and expertise make them the popular choice of the professional and amateur cyclist the world over.
Shimano Ultegra 6600 BB Cups
HollowTech II integrated bottom bracket uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency
Seal design has minimal bearing interface ensuring smooth rolling and increased durability, and keeps out dirt and water
Set includes left and right hand cups, inner cover and inner O-rings