Shimano Ultegra FC-R8100 Crankset

Shimano ULTEGRA FC-R8100 12-Speed Crankset

The FC-R8100 crankset is a core part of Shimano’s 12-speed ULTEGRA road groupset, designed for riders who demand smooth, precise front shifting and efficient power transfer. With its lightweight construction and advanced Hollowtech II and Hollowglide technology, it delivers an excellent balance of stiffness, weight, and rotational performance.

Why it’s great for you:

• Optimized power transfer: Hollowtech II crank arms are hollow-forged for rigidity without unnecessary weight. The outboard bottom bracket bearings improve stability and efficiency.
• Smooth 12-speed shifting: Hollowglide technology and precision-engineered chainrings ensure crisp, reliable shifts under load.
• Variety of sizes and gearing: Choose from crank arm lengths and chainring combinations to fit your riding style and biomechanics.
• Durable and precise: High-precision bearing seals and a 24 mm spindle maximize longevity while maintaining excellent rotating performance.
• Lightweight performance: Average crankset weight ranges from ~700–711 g depending on chainring size.

Technical Highlights:

• Series: ULTEGRA
• Rear Speeds: 12
• Chain Compatibility: HG 12-speed
• Q-Factor: 148 mm
• Bottom Bracket: Hollowtech II outboard; compatible with SM-BBR60 (threaded) and SM-BB72-41B (press-fit)
• Optional Chain Guard: Not included
• P.C.D.: 110 mm
• Average Weight: 700–711 g depending on chainrings

Fit & Performance Tip:
Thanks to its range of crank lengths and chainring options, the FC-R8100 is suitable for riders of all sizes, including triathletes or those with specific biomechanical requirements. Its combination of Hollowtech II and Hollowglide ensures that every watt you put into the pedals is transferred efficiently to the drivetrain, giving you smoother acceleration and a more responsive ride.

If you want a lightweight, precise, and durable crankset for Shimano’s 12-speed ULTEGRA system, the FC-R8100 offers top-end performance for serious riders without the weight penalty of higher-tier models.