All bottom brackets are not created equal. That's why Shimano bottom brackets outlast almost all others. Superior sealing, ultra-tight manufacturing tolerances and quality bearings combine to make a bottom bracket that rolls freely and never develops play. The Shimano Ultegra 6800 Bottom Bracket Cup Set is no exception to Shimano's exceptional quality. Available to fit both English or Italian threaded frames, the 6800 bottom bracket weighs 76 grams, shaving 15 grams off that of the Ultegra 6700. Not only is it smaller and lighter but it is purported to reduce rotational friction by 50% over the previous Ultegra bottom bracket due to advances in the sealing technology. Shimano manages yet again to bring you Dura-Ace quality at the Ultegra level, so you too can be exceptional.
Reduced size for light weight
New seal construction for smoother rotation
Requires TL-FC34 or included TL-FC24 adaptor for installation & removal