The all-new Shimano Ultegra R8000 series crank features lightweight crankarms, a hollow outer chainring, and a wider gear pitch for increased clearance on modern road frames. It is available with 53-39, 52-36, 50-34, and 46-36T chainrings and 165, 170, 172.5, and 175mm crank arm lengths.

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. The addition of 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.

HG-EV - HG-EV cassette sprocket is for rider-tuned gear combination & cadence management. We provide optimal 11-speed drivetrain gear ratio; you can choice wider and closer gear combination available to match various riding disciplines. HG-EV cassette sprocket is obtained 11-speed gear without compromising the 10-speed durability and improved HyperGlide shifting.

HollowGlide - Hollow technology on outer chainring . High rigidity hollow structure cuts down on weight yet maintains strength. Better power transfer and quicker and more precise front shifting

HollowTech - Hollow forged crank arms. A lightweight crankset not only reduces the bike’s weight, but decreases rotating mass to aid in acceleration.
The challenge is to reduce the weight of the crank without reducing its strength and rigidity. Shimano’s advanced forging technology has solved the problem through the HollowTech crank.  Just like high quality frame tubing, a hollow crank arm can provide amazing strength and rigidity at very lightweight.

 

Features

Minimal weight without sacrificing stiffness
Wider gear pitch increases clearance between chain and leading teeth, providing compatibility with frames of O.L.D. 135 mm and 410 mm chainstay length
Lightweight crankarm design optimized for power-transfer efficiency
Rider-tuned gear performance through various gear combinations
Redesigned FC for greater frame compatibility

Specifications

Average weight 690 g (53-39T), 681 g (52-36T), 674 g (50-34T), 668 g (46-36T)
HollowTech II Technology Yes
Threaded BB shell width 70mm Yes
Chain line (mm) 43.5
Chain ring combination 50-34T, 52-36T, 53-39T, 46-36T
Compatible BB type - Outboard Yes
Compatible BB type Outboard
Compatible chain HG-EV 11-speed, HG-X11
Crank Arm Length 165 mm, 170 mm, 172.5 mm, 175 mm
Crank fixing bolt included Yes
Crank arm length (mm) - 165.0 Yes
Crank arm length (mm) - 170.0 Yes
Crank arm length (mm) - 172.5 Yes
Crank arm length (mm) - 175.0 Yes
Gear arms 4
HollowGlide X (46-36T)
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-BBR60-PB
Recommended BB - Threaded (normal) SM-BBR60
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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