The Shimano Dura-Ace FC-R9100 inner chainring is engineered for elite-level power transfer and shifting precision. Its reinforced construction works in tandem with Shimano’s unique asymmetrical four-arm spider to maximize stiffness while minimizing weight. This 11-speed component is the benchmark for professional road racing performance.

Crafted from high-grade aluminum, the inner ring features optimized tooth profiles for smooth, reliable chain transitions under high torque. It uses the 110mm asymmetrical BCD specific to Shimano's top-tier cranksets. This replacement ring ensures your drivetrain maintains the crisp, factory-standard shifting quality Dura-Ace is known for.

Quick Facts

Feature	Specification
Series	Dura-Ace R9100
Speeds	11-Speed
BCD	110mm (Asymmetric 4-Arm)
Material	Aluminum
Position	Inner
Compatibility	Shimano FC-R9100 / R8000 / R7000