Shimano Dura-Ace FC-R9100 HollowTech II Double Chainset

The HollowTech II 11-speed Dura-Ace chainset offers the optimum balance of light weight and rigidity, making it the
global choice for road racing’s elite riders.

The choice of the world’s best climbers, sprinters, and time trialists, the Dura-Ace R9100 crank drops weigh while
maximizing 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.

Technology

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.

HG-X11 Chain

Silky driving, accurate shifting HG-X11 directional chain realize more smoother shifts and greater overall
performance. Right and left sides are optimized for front and rear shifting respectively.

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 Crank Arm

Hollow forged crank arms; a light weight 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.

HollowTech II

Providing the best balance of stiffness, strength, weight and rotating performance. The concept of HollowTech II
technology is focused on producing a superior crankset which will maximize 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. Naturally, Shimano strove for the optimum balance
between the conflicting needs of stiffness while producing a lightweight crank. HollowTech technology is an
ultra-lightweight hollow crankarm created by Shimano with the company’s own proprietary forging technology that also
maintains rigidity. 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.

The HollowTech II crankset has been developed by pursuing the optimum balance of stiffness & rotating performance
in a lightweight and beautiful crankset design. Moreover, HollowTech II crankset has a high-precision sealing in the
bearing area to increase durability maintaining the excellent rotating performance for long periods.

24mm Diameter Axle And Bearings

Why choose the 24mm axle and bearings for the HollowTech II crankset?

The diameter of the Bottom Bracket axle and bearings was of primary importance for the development because the
Bottom Bracket axle area is tied to such key elements as stiffness, strength, weight and rotating performance.

What’s important is the total balance of crankset

In addition, taking the crankset as a whole, the total balance of crankarm rigidity, axle stiffness, bearing
position and others is essential. Indeed, the crankset is designed by careful consideration of the total balance
of those elements to prevent breakage.

Outboard Bearing

For most frames with 68mm Bottom Bracket shells, HollowTech II with 24mm axle can set the bearing position
outside of the frame to provide better weight distribution and more stability.

24mm Diameter Axle And Bearings Provide Optimum Balance For The Crankset

After studying all these problems thoroughly, we made the decision to adopt the 24mm diameter axle and bearings,
which have the optimum balance, for the HollowTech II crankset.

In addition, an examination of the total crankset, including the crankarm and gears, proves the optimum balance
of rigidity, weight and rotating performance for the ultimate transfer of power to your bike. HollowTech II is
simply the most optimized crankset design on the market.

Features

• Hollow outer chainring, giving vast improvements in rigidity and increased weight savings
• The hollow outer chainring has essentially removed outer chainring flex, hugely improving shift performance
  making it precise even under high load
• These industry leading HollowTech II 4 arm cold forged hollow crank arms have been evolved to increase rigidity,
  reduce weight, and improve strength
• The teeth have been developed to work only in conjunction with the 11-speed chains for improved contact
  providing more efficiency and improved power transfer
• There is a wide range of chainring ratios and crank arm lengths available enabling customisation for all riders
  and racing disciplines
• HollowTech II integrated bottom bracket design uses a wider bearing placement and larger axle diameter for
  increased stiffness and efficiency
• Bottom bracket seal design has a minimal bearing interface gives superbly smooth rolling and increased
  durability

Specification

• Compatible Chain: LinkGlide, HG 11-speed
• Q-Factor: 146mm
• Chainline: 43.5mm
• PCD: 110mm
• Weight: 609g (50-34T)