Dura Ace Disc Groupset with RS685 shifters and a choice of callipers (flat or post mount)
System engineering at its peak.
Each of the components magnifies the qualities of the others for an unparalleled level of performance. Optimizing input to maximize output. That's how it achieves supremacy.
The concept behind of the Dura Ace 9100 groupset was to examine and improve every component, to optimize the input and maximize the output. The result is less energy loss between what the rider puts in and what goes out at the wheels. The chainset has been completely redesigned, with a new look and enhanced shfiting performance. Rigidity is increased by an enlarged crank arm, but weight is reduced by 7g from the previous 9000 chainset.
The shifting levers feature the usual customizable position, weighing in at 365g, whilst the rear derailleur has had a dramatic overhaul and has incorporated a design more from mountain bikes. It now features Shadow technology, positioning the rear derailleur further below the functioning sprocket, keeping it out of harms way.
Overall, the groupset offers a truly superior drivetrain, with incredibly reliable shifting performance. Please note: the STI shifters, and callipers are not 'Dura Ace' series componentry
- 11 Speed
- Top of the range groupset
- Shadow rear derailleur
- Available in Flat Mount (RS805) or Post Mount (RS785) with RS685 shifters
- Rotors not included