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The Shimano Ultegra line brings professional-grade racing technology to the practical, everyday road cyclists. By improving upon the design of the previous Ultegra bottom bracket, Shimano was able to make the 6800 series Ultegra bottom bracket smoother and lighter than previous Ultegra bottom brackets while remaining completely backwards compatible with existing cranksets. The BBR60 bottom bracket weighs in at a mere 77g, a whole 14g lighter than the 6700 bottom bracket which is due in part to the smaller bottom bracket cups. These smaller BB cups require use of the included TL-FC25 adapter to install and remove by simply attaching to your existing bottom bracket tool. The new design also reduces friction by 50% compared to a 6700 bottom bracket by improving upon the seal design. The new 6800 series Ultegra bottom bracket is completely backwards compatible with any Hollowtech II crankset, making it the perfect match for any cyclist.