Another technical import from our established MTB technology, the Dura-Ace Hollowtech II crank and bottom bracket combines race-proven hollow forging technology with the integrated crankset and bottom bracket.
They're one unit now, not two. The number of parts is reduced, weight is reduced and efficiency has been radically increased. A combined FC/BB weight reduction of 30 grams has been achieved. In addition, Hollowtech II allows the bottom bracket bearings to be spaced wider apart (outboard bearings) and the axle and bearings themselves to be larger. The net result of course is a more effective load distribution, increased rigidity and stability, as well as longer service life. Up off the saddle, on the big ring, the chain doesnt rub the front derailleur cage proclaim our top professional test riders.
740 grams (With Integrated Bottom bracket)
Bottom Bracket Bearings NOT included.
