This is a Shimano SM-BBR60 Bottom Bracket Unit. Weighing in at 77g, the SM-BBR60 Ultegra Bottom Bracket is 14 grams lighter than the 6700 bottom bracket offering professional level technology for the everyday cyclist.
Reduced size for light weight
14g lighter and 50% less friction than BB6700
Available in either 68mm English or 70mm Italian versions