Shimano FC-R8100 Ultegra 12-Speed Double Chainset Cranks with HollowTech II Technology

The Shimano FC-R8100 Ultegra 12-speed double chainset represents a refined engineering achievement designed to meet the demands of serious road cyclists. Combining a lightweight construction with exceptional stiffness, this crankset utilises advanced HollowTech II technology to deliver superior power transfer and precise shifting performance. Its design is tailored for riders who require reliability and efficiency, whether competing in races or engaging in rigorous training sessions. As part of the Bike Components category, it integrates seamlessly into high-performance drivetrains, offering versatility and durability.

Featuring the innovative HollowGlide hollow outer chainring, the FC-R8100 minimises flex under intense pedalling forces, ensuring consistent and accurate gear changes. It is engineered specifically for 12-speed HG chains, with optimised chainring teeth that enhance contact and reduce energy loss. The crankset supports frames with an O.L.D. spacing of 135 / 142 mm, broadening its compatibility across a wide range of road bike builds. Multiple chainring sizes and crank arm lengths are available, allowing riders to tailor their setup to their individual riding style and preferences.

Complementing the crankset, Shimano’s HollowTech II integrated bottom bracket employs wider bearing placement and a larger axle diameter to increase stiffness and smoothness during pedalling. Its advanced seal design reduces friction at the bearing interface, promoting long-term durability and consistent performance. Note that the bottom bracket is sold separately, providing flexibility for custom installations.

Key Features & Benefits

• HollowTech II Technology: Delivers an optimal balance of lightweight design and robust stiffness for enhanced cycling efficiency.
• HollowGlide Outer Chainring: Minimises flex to provide precise and reliable shifting even under high pedalling loads.
• 12-Speed HG Chain Compatibility: Chainring teeth are engineered to optimise power transfer and improve drivetrain efficiency.
• Wide Gear Pitch Spacing: Ensures broad compatibility with frames featuring O.L.D. 135 / 142 mm spacing.
• Customisable Options: Available in multiple chainring sizes and crank arm lengths to suit diverse rider requirements.
• Durable Bottom Bracket Design: HollowTech II integrated bottom bracket reduces friction and enhances smooth pedalling (sold separately).

What It’s Good For

• Road cyclists seeking a high-performance crankset combining lightweight construction with stiffness.
• Competitive riders requiring precise and consistent shifting under demanding conditions.
• Users needing compatibility with a range of frame specifications and drivetrain configurations.
• Riders who prioritise customisation to match their specific cycling style and terrain.

What It’s NOT Good For

• Use with single-speed or non-12-speed transmission systems, as compatibility is limited.
• Frames that do not conform to O.L.D. 135 / 142 mm spacing standards.
• Riders requiring a crankset designed for extreme off-road or mountain biking conditions.
• Users expecting the bottom bracket to be included within the crankset package.

Frequently Asked Questions

Is the bottom bracket included with this crankset?
The HollowTech II integrated bottom bracket is sold separately and must be purchased independently to complete the drivetrain assembly.

Can I use this crankset with non-Shimano chains?
This crankset is optimised specifically for Shimano 12-speed HG chains to ensure maximum shifting performance. Using alternative chains may compromise shifting precision and drivetrain efficiency.