The Shimano Ultegra FC-08 brings race-proven Hollowtech II construction to enthusiast road riders in a compact 50/34T configuration. The 165mm crank arm length suits smaller riders or those who favour a higher cadence, while the hollow-forged arms and HollowGlide outer chainring keep weight to a minimum without sacrificing the stiffness needed for efficient power transfer.

Highlights

• Hollowtech II interface: Integrated spindle design delivers exceptional stiffness and easy installation with outboard bottom brackets.
• HollowGlide outer chainring: Hollow-forged aluminium construction reduces weight while maintaining rigidity for precise shifting.
• Compact 50/34T gearing: Versatile chainring combination handles both climbs and faster road sections with ease.
• 165mm crank arm length: Ideal for smaller-statured riders or cyclists who prefer a quicker pedalling cadence.
• 110mm asymmetric BCD: Four-bolt spider accepts a wide range of Shimano 11-speed road chainrings for future flexibility.
• Wide gear pitch: Increased spacing between chainrings reduces chain drag and improves shift quality across 11 speeds.
• 674g total weight: Lightweight hollow-forged construction keeps the rotating mass low.

Hollowtech II Construction

Shimano's Hollowtech II system integrates the spindle directly into the right crank arm, removing the traditional separate axle interface. The hollow-forged crank arms and HollowGlide outer chainring work together to reduce weight without compromising the lateral stiffness critical for efficient power delivery. The result is a crankset that punches well above its price point — precise, responsive, and built to last.

Wide Gear Pitch

The FC-08 uses a wider gear pitch than earlier Ultegra designs. The increased spacing between chainring faces reduces chain interference and drag during shifting, extending chainring life and ensuring crisp front shifts across all 11 gears. This geometry also accommodates a broader range of modern road frame designs.

Compatibility & Fit

Designed for Shimano 11-speed road drivetrains. Compatible with Shimano HG-EV and HG-X11 11-speed chains. Chainline: 43.5mm. Q-factor: 146mm. Fits frames with 130mm O.L.D. rear spacing and 135/142mm road disc hub spacing. Requires a compatible outboard bottom bracket (such as Shimano SM-BBR60 for threaded shells) — sold separately, not included.