Shimano FC-R8100 Ultegra 12-Speed Outer Chainring

The Shimano FC-R8100 Ultegra 12-Speed Outer Chainring is a high-precision road component built to restore exact shifting performance and drivetrain efficiency. Its standout HOLLOWGLIDE hollow outer chainring design boosts rigidity and cuts weight, reducing flex and maintaining clean shifts under load. The chainring works with Shimano’s 12-speed systems to support smooth power transfer and long-term reliability.

Key Features and Benefits:

• HOLLOWGLIDE hollow outer chainring structure: This uses a hollow-formed outer plate that increases torsional rigidity. The strengthened structure reduces flex during forceful shifts, which improves accuracy. The outcome is consistent front shifting that stays stable even at high torque.
• 12-speed-specific tooth shaping: Each tooth matches the interface of Shimano HG 12-speed chains. This increases chain contact and stabilises movement across the ring. The outcome is improved drive efficiency and more direct power transfer on every rotation.
• Optimised for FC-R8100 and FC-R8100-P cranksets: The ring aligns with the crank arms and bolt pattern with precise tolerances. This ensures a secure fit and reduces unwanted movement. The outcome is dependable performance that meets factory specification.
• High-load shifting support: The engineered profile prevents the outer ring from deforming when shifting under pressure. This feature maintains chain control across the full gear range. The outcome is reliable front shifting during demanding efforts.
• 110mm BCD, 4-arm integration: The compact bolt circle allows an efficient balance between weight and strength. This supports a rigid interface with the crank arm. The outcome is a stable and responsive drivetrain feel.
• Durable construction for road, time trial, and triathlon use: The materials and machining resist wear from high-cadence and high-power riding. This retains tooth integrity over time. The outcome is long-lasting performance that reduces the need for frequent replacements.

This chainring suits riders who prioritise precise shifting under load. The HOLLOWGLIDE construction and 12-speed-specific tooth design work together to deliver stable engagement and dependable transfer of force. Each feature is built to maintain accuracy across the drivetrain, supporting consistent performance across a wide range of riding conditions.

Choose the Shimano FC-R8100 Ultegra 12-Speed Outer Chainring to restore factory-level smoothness and strength to your drivetrain. Its rigid structure and precise tooth shaping give you the confidence to keep your bike running at its best.

Specification:

• Compatible chain: Shimano HG 12-speed
• Speed: 12 Speed
• Discipline: Road
• Discipline: Time Trial & Triathlon
• Colour: Black
• Size: 50 teeth
• Bolt Circle Diameter: 110mm
• Chainring Fitting: 4 Arms