The Shimano Ultegra FC-R8000 is a pro-trickle-down road crankset that brings Dura-Ace-level technology to performance riders who want genuine stiffness and weight savings without the flagship price. The 46/36T compact double configuration with 170mm crank arms is the ideal choice for riders who tackle varied terrain — offering a wider range than a standard double while keeping the system light and efficient.

Highlights

• Hollowtech II spindle integration — 24mm steel spindle built into the drive-side crank arm for maximum rigidity and outboard bearing placement
• Aluminium/CFRP hollow outer chainring reduces weight while maintaining torsional stiffness
• 4-bolt asymmetrical spider, 110mm BCD — optimised for both compact and semi-compact chainring combinations
• 46/36T compact double — versatile gearing for road, sportives, and mixed-terrain riding
• 170mm crank arm length suits a wide range of rider heights and biomechanical preferences
• Wider gear pitch increases chainstay clearance — compatible with modern frames down to 410mm chainstay length
• 668g claimed weight — excellent for an 11-speed road double at this price point
• 11-speed compatible: works with Shimano HG-EV and HG-X11 chains

Hollowtech II Technology

Shimano's Hollowtech II system integrates the bottom bracket spindle directly into the drive-side crank arm, eliminating flex points that would otherwise rob you of power. Bearings are repositioned outboard for improved pedalling stability and bearing longevity. The result is a crankset that transfers effort into forward motion with minimal energy loss — a design Shimano has refined across multiple generations of road groupsets.

Chainring Construction

The outer chainring on the FC-R8000 uses an aluminium and CFRP (carbon fibre reinforced polymer) hollow construction — the same technology found on the Dura-Ace FC-R9100. This keeps rotating weight low without compromising the stiffness needed for reliable shifting under load. The inner ring is solid aluminium. Both rings feature Shimano's refined tooth profiling for smooth, positive 11-speed chain engagement.

Compatibility & Fit

The FC-R8000 is designed for Shimano 11-speed road drivetrains (Ultegra R8000 and Dura-Ace R9100 compatible). It pairs with Shimano front derailleurs designed for 11-speed double road use. A separate bottom bracket is required — Shimano recommends the SM-BBR60 (threaded) or SM-BBR60-PB (press-fit) for standard road frames. The 43.5mm chainline is optimised for Shimano 11-speed rear derailleurs and cassettes. Not compatible with 12-speed groupsets.

• Speed: 11-speed
• Chainring: 46/36T
• Crank arm length: 170mm
• BCD: 110mm asymmetrical 4-bolt
• Chainline: 43.5mm
• Q-factor: 146mm
• Bottom bracket: SM-BBR60 or SM-BBR60-PB (sold separately)
• Chain compatibility: Shimano HG-EV 11-speed / HG-X11
• Part code: IFCR8000CX66