The Shimano Ultegra FC-08 brings Dura-Ace-derived engineering within reach of serious road cyclists — delivering race-ready stiffness, crisp front shifting, and a genuine weight advantage in a crankset built to handle fast training, sportives, and mixed-terrain road racing. This 52/36T, 175mm variant is the go-to choice for riders seeking versatile gearing with optimal leverage for their position.

Highlights

• Hollowtech II construction: hollow-forged aluminium crank arms deliver outstanding stiffness-to-weight with an integrated 24mm spindle for direct power transfer.
• Hollow outer chainring: aluminium outer ring with Hollowglide tooth profile keeps weight down while ensuring crisp, reliable front shifts under load.
• Wider gear pitch: increased chainring-to-chainring spacing reduces chain-to-chainstay contact — compatible with frames from 135mm OLD and 410mm chainstay length.
• 52/36T combination: performance road gearing for fast riding and varied terrain, pairing well with the full range of 11-speed rear cassettes.
• 175mm crank arm length: suits taller riders or those requiring additional leverage for their pedalling style.
• Trickle-down lineage: design and shifting geometry inherited from the Dura-Ace R9100 generation.
• 11-speed compatibility: engineered for Shimano HG-EV and HG-X11 11-speed chains and Ultegra-series front derailleurs.

Hollowtech II & Chainring Engineering

Shimano's Hollowtech II platform uses hollow-forged aluminium crank arms bonded with an integrated spindle — the outboard bearing design places bearings closer to the pedal axle, reducing flex and improving power transfer feel. The outer chainring uses the Hollowglide tooth profile, shaped for faster, more positive front shifts whether climbing out of the saddle or accelerating on the flat. The wider gear pitch between rings mirrors the geometry introduced in the R9100 Dura-Ace generation, maintaining the tidy chainline that modern road frames demand.

Compatibility & Fit

Designed for Shimano 11-speed road drivetrains. BCD: 110mm asymmetric. Chainline: 43.5mm. Q-factor: 146mm. Weight (52/36T, 175mm): 681g. Compatible with Shimano HG-EV and HG-X11 11-speed chains, and Ultegra (R8000) or equivalent front and rear derailleurs. Requires a separate outboard bottom bracket — Shimano SM-BBR60 (threaded BSA) or equivalent press-fit bottom bracket (sold separately). Replacement chainrings must be 110mm asymmetric BCD compatible with Ultegra 11-speed.