The Shimano Dura-Ace FC-09 is the current-generation 11-speed crankset from Shimano's flagship road groupset, combining R9200-generation HollowTech II crank arms with dedicated Hollowglide chainrings engineered for precise 11-speed shifting. In a 50-34T compact configuration with 170mm crank arms, it suits a wide range of road riders — from endurance cyclists to those tackling mixed terrain — without compromising top-end Dura-Ace performance.

Highlights

• HollowTech II construction: Integrated right crank arm and 24mm hardened steel spindle deliver a stiff, lightweight power path with minimal drivetrain flex.
• Asymmetric 4-arm spider: 110mm BCD design positions material exactly where stiffness is needed, reducing weight without sacrificing torsional rigidity.
• Hollowglide chainrings: Shimano 11-speed-specific tooth profiles and shifting ramps ensure smooth, reliable chain engagement and front shifts under load.
• 50-34T compact gearing: Wide gear range suits climbers, all-road riders, and cyclists seeking versatility across varied terrain.
• 170mm crank arm length: Suits a broad range of rider heights and biomechanics for an efficient pedal stroke.
• R9200-generation crank arm design: Updated geometry from Shimano's current Dura-Ace platform, combining refined stiffness with classic Dura-Ace aesthetics.

HollowTech II Technology

Shimano's HollowTech II platform integrates the right crank arm and spindle into a single forged and hollow unit. The 24mm-diameter hardened steel spindle passes through the bottom bracket shell and locks directly to the left arm, eliminating the flex points inherent in traditional two-piece designs. The result is direct, efficient power transfer — a defining characteristic of Dura-Ace engineering.

Hollowglide Chainrings

The FC-09's Hollowglide rings are profiled specifically for Shimano 11-speed chain geometry. Strategically shaped teeth and ramp profiles guide the chain cleanly between rings under load, while the asymmetric 4-arm spider provides a rigid and consistent chain path throughout the full pedal stroke. The rings are compatible with Shimano HG-EV and HG-X11 11-speed chains.

Compatibility & Fit

Designed for Shimano 11-speed road drivetrains — compatible with both mechanical and Di2 electronic front derailleurs. Requires a HollowTech II-compatible bottom bracket (such as Shimano BB-R9100 or equivalent); bottom bracket is not included. Fits 68mm and 70mm threaded BB shells. Chainline: 43.5mm. Q-factor: 146mm. BCD: 110mm (asymmetric 4-arm). Compatible chains: Shimano HG-EV and HG-X11 11-speed.