The choice of the world's best climbers, sprinters, and time trialists, the Dura-Ace R9100 crank drops weigh while maximising power transfer.

The new design, and its iconic look, is adapted for race specific disc brake systems while still offering a wide range of gearing and crank arm length options.

Technologies

HollowTech II - The concept of HollowTech II technology is focused on producing a superior crankset which will maximise a rider’s power transfer. The rigidity of the crankset ensures pedaling efficiency while its weight, a key element of the crankset, you want light, aids in cycling longer distances over which the rider needs to pedal more. Hollowtech II technology integrates the bottom bracket axle with the right crankarm for more stiffness and a weight savings to achieve a high-dimensional balance. Its outboard bottom bracket bearing system provides better weight distribution and more pedaling stability, allowing for more efficient power transfer. 

Features

Best balance for lighter weight (-7g) and efficiency
Maintains high rigidity and reduces weight
Shorter length of rear center with O.L.D.135mm
Optimum power transfer
Iconic design
Adapted for race specific disc brake system
Rider tuned gearing options

Specifications

Average weight 650 g (55-42T), 642 g (54-42T), 626 g (53-39T), 624 g (52-36T), 614 g (50-34T)
Hollowtech II Technology Yes
Threaded BB shell width - 70mm Yes
Chain line (mm) 43.5
Chain ring combination 55-42T, 54-42T, 53-39T, 52-36T, 50-34T
Compatible BB type - Outboard Yes
Compatible BB type Outboard
Compatible chain HG-EV 11-speed, HG-X11
Crank Arm Length 165 mm, 167.5 mm, 170 mm, 172.5 mm, 175 mm, 177.5 mm, 180 mm
Crank fixing bolt included Yes
Gear arms 4
HollowGlide Yes
HollowTech Technology Yes
Optional chain guard - Without chain / bash guard Yes
Optional Chain Guard Without chain guard
P.C.D. (mm) 110
Rear speeds 11
Recommended BB - Pressfit SM-BB92-41B
Recommended BB - Threaded (normal) BB-R9100
Technology HollowTech BB, HollowTech II
Threaded BB shell width - 68mm Yes
Threaded BB Shell Width 68 mm, 70 mm
Includes Crank Arm Fixing Bolt Yes
Q-factor (mm) 146

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