The Shimano Dura Ace CS R9100 cassette is engineered for riders who prioritise tight gearing, instantaneous shifting, and absolute drivetrain efficiency. Designed for high speed road racing and fast paced riding, this close ratio cassette allows finer cadence control, helping maintain power output and rhythm during sustained efforts and aggressive accelerations.

Built around Shimano Hyperglide EV technology, the CS R9100 delivers exceptionally crisp and smooth gear changes even under heavy load. A rigid carbon and alloy carrier supports the largest sprockets, while extensive machining and titanium construction keep overall weight impressively low without sacrificing stiffness or durability. Every detail is focused on performance, making this cassette a true flagship component for serious riders.

• Hyperglide EV sprockets with computer designed tooth profiles and contoured shift gates for smooth shifting under load
• Close ratio gearing for efficient energy use and precise cadence control
• Rigid carbon and alloy carrier improves shifting accuracy and reduces weight
• Five largest sprockets manufactured from titanium to minimise weight while maintaining strength
• Extensively cut away and drilled sprockets to further reduce weight without compromising rigidity
• Nickel plated finish for excellent corrosion resistance and long service life
• Corrosion resistant alloy cassette lockring included
• Compatible with Super Narrow 11 speed HG EV chains
• Freehub compatibility: Shimano HG 
• Speed: 11
• Tooth range: 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 21 / 23 / 25
• Colour: Silver
• Weight: 175g