The Shimano Dura-Ace CS-R9100 is the pinnacle of 11-speed road cassette engineering, combining titanium cogs, carbon spiders and refined HyperGlide tooth profiling to deliver the fastest, smoothest shifting available for road racing. Designed for elite road and criterium riders who demand the best from every drivetrain component, the 12-28T spread suits most road racing and gran fondo use.

Highlights

• Titanium large cogs: The five largest sprockets are machined from titanium, delivering significant weight savings where it matters most.
• Steel small cogs: The six smallest sprockets are steel for maximum durability and wear resistance under high pedalling loads.
• Carbon spider construction: Carbon fibre spiders link the larger cogs into subassemblies, adding stiffness while keeping overall weight exceptionally low.
• HyperGlide tooth profiling: Refined tooth design across every sprocket enables smooth, precise shifting under load throughout the entire range.
• 12-28T range: Sprocket sequence 12-13-14-15-16-17-19-21-23-25-28T suits road racing to rolling terrain with close, even steps.
• 205g total weight: One of the lightest 11-speed cassettes available, contributing to a lighter overall drivetrain build.

Construction & Technology

The CS-R9100 uses a multi-material approach to balance weight and durability. The five largest cogs — where titanium's strength-to-weight advantage is most pronounced — are machined from titanium and grouped using lightweight carbon spiders. The remaining six smaller cogs, which see the highest chain tension and wear, are precision-machined steel. This modular carrier system makes the cassette straightforward to install and remove with standard tools.

Compatibility & Fit

The CS-R9100 is an 11-speed road cassette compatible with Shimano HG 11-speed freehub bodies. It is designed for use with Shimano 11-speed road groupsets including Dura-Ace R9100, Ultegra R8000, and 105 R7000. Recommended chains include the CN-HG901-11 and other Shimano 11-speed road chains. Not compatible with 10-speed or 12-speed drivetrains, or with SRAM XD/XDR freehubs.