Lightweight and stiff 2x12-speed road bike crankset with HOLLOWTECH II, HOLLOWGLIDE chainrings, and sporty 52/36-tooth gearing for maximum power transfer and precise shifting.

The Shimano Ultegra FC-R8100 crankset combines high stiffness, low weight, and efficient power transfer for demanding road cyclists. As a key component of the Ultegra R8100 12-speed group, it impresses with an optimized chainring design, precise gear shifts, and high-quality workmanship.

Thanks to proven HOLLOWTECH II technology, the hollow-forged aluminum crank arms offer an excellent balance of stiffness, stability, and weight. The integrated 24 mm steel axle enables direct and efficient transfer of pedal power to the drivetrain.

The HOLLOWGLIDE technology of the large chainring ensures fast, precise shifts thanks to its lightweight, stiff hollow construction. The optimized tooth profile supports reliable chain shifts between the two chainrings, even under heavy loads.

With its 52/36-tooth gearing, the Ultegra FC-R8100 offers sporty gearing for fast rides on flat roads, intensive training sessions, and challenging climbs. The 172.5 mm crank arms, a 44.5 mm chainline, and a 148 mm Q-factor round out its performance-oriented design.

Highlights:

• HOLLOWTECH II: hollow-forged aluminum crank arms for high stiffness and efficient power transfer at low weight.
• HOLLOWGLIDE chainring: lightweight and stiff construction for fast, precise shifts.
• 52/36-tooth gearing: sporty gearing for high speeds and versatile road bike use.
• 2x12-speed compatibility: Optimized for modern Shimano Ultegra and Dura-Ace 12-speed drivetrains.
• Asymmetric 4-arm crank spider: Balanced stiffness and low weight thanks to targeted material distribution.
• 172.5 mm crank length: Proven length for an efficient, sporty pedaling motion.

Technical specifications:

• Manufacturer: Shimano
• Product series: Ultegra R8100
• Model: FC-R8100
• Product type: crankset
• Intended use: Road bike
• Drivetrain: 2-speed
• Gears: 12-speed
• Chainring sizes: 52/36 teeth
• Crank length: 172.5 mm
• Bolt circle diameter: 110 mm
• Crank spider: Asymmetric 4-arm mount
• Chainline: 44.5 mm
• Q-factor: 148 mm
• Bottom bracket standard: Hollowtech II
• Crankshaft diameter: 24 mm
• Recommended bottom bracket BSA: Shimano SM-BBR60
• Recommended press-fit bottom bracket: Shimano SM-BB72-41B
• Compatible front derailleurs: Shimano FD-R8150, FD-R9250
• Compatible chains: Shimano HG+ 12-speed, e.g. CN-M9100, CN-M8100, CN-M7100, CN-M6100
• Crank arm material: Aluminum, anodized
• Crank spider material: Aluminum
• Crankshaft material: Steel
• Large chainring material: Aluminum / carbon fiber reinforced plastic (CFRP)
• Small chainring material: Aluminum, anodized
• Chainring bolt material: Aluminum
• Technologies: HOLLOWTECH II, HOLLOWGLIDE
• Finish: Matte
• Color: Gray / Anthracite
• Weight according to manufacturer: approx. 711 g
  

Technologies:

• HOLLOWTECH II: The hollow-forged aluminum crank arms and integrated 24 mm steel axle offer an optimal combination of high stiffness, low weight, and efficient power transfer. The construction minimizes energy losses and improves drivetrain efficiency.
• HOLLOWGLIDE: The large chainring features a lightweight, particularly stiff hollow construction made of aluminum and carbon fiber-reinforced plastic. This reduces deformation and supports fast, precise shifting.
• Asymmetrical 4-arm crank spider: The optimized arrangement of the crank arms ensures targeted distribution of the forces involved and provides high stiffness with minimal material use.

Included:

• 1x Shimano Ultegra FC-R8100 crankset with 172.5 mm crank length
• 1x Shimano chainring combination, 52/36 teeth (pre-installed)
• Note: Supplied without bottom bracket and pedals.

Manufacturer part number: IFCR8100DX26 | EAN: 4550170894054

The Shimano Ultegra FC-R8100 crankset combines state-of-the-art 12-speed shifting technology with high stiffness and low weight. With its sporty 52/36-tooth gearing and 172.5 mm crank arms, it is the ideal choice for performance-oriented road cyclists who value efficient power transfer and precise shifting.