Shimano Ultegra 6800 Bottom Bracket - BSA

Shimano Ultegra 6800 HollowTech II Bottom Bracket

The Shimano Ultegra 6800 bottom bracket offers a slightly updated shape and promises of up to half the friction over the previous 6700 bottom bracket. The Ultegra 6800 bottom bracket shaves approximately 14 grams over its predecessor, weighing in at just 77 grams.