With their special tooth profiles, mount donate and climbing aids allow Dura Ace FC-R9100 chainrings a particularly soft and fast switching. So with them a shift under load, as it was usual only from the rear derailleur, easily possible. Its construction of carbon fiber reinforced plastic with aluminum teeth helps to keep the weight low while increasing torsional rigidity. The hollow section of the large chainrings also contributes to this.
- Group: Dura Ace FC-R9100 11-speed
- Suitable for: FC-R9100
- Gear arms: 4-arm
- Gradation: Type MW (for 53-39T)