The Shimano Dura-Ace CS-R9100 is a flagship 11-speed road cassette engineered for competitive road racing. Combining five titanium sprockets with six nickel-plated steel cogs on a carbon and alloy carrier, the 11-30T range covers flat stages through moderate climbs without sacrificing top-end gearing — all at the lowest possible weight.

Highlights

• Titanium sprockets: Five titanium cogs (the five largest) paired with nickel-plated steel cogs significantly reduce overall cassette weight to approximately 211 g.
• Carbon and alloy carrier: Stiff, lightweight spider construction minimises flex under hard accelerations and sprint efforts.
• Hyperglide shifting: Shimano's Hyperglide sprocket profiling delivers fast, quiet, and precise gear changes under load — both up and down the block.
• 11-30T range: 11-speed sprocket sequence (11-12-13-14-15-17-19-21-24-27-30) suits road racing, gran fondos, and hilly sportives.
• HG-EV chain compatibility: Optimised for use with Shimano HG-EV 11-speed and HG-X11 chains for smooth, consistent engagement.
• Dura-Ace integration: Designed as part of the R9100 groupset ecosystem for seamless compatibility with Dura-Ace and Ultegra 11-speed derailleurs and shifters.

Construction & Technology

Shimano's engineers selected titanium for the five largest sprockets — the cogs that see the most use on climbs — where saving grams matters most. The remaining six smaller sprockets use durable nickel-plated steel to handle the higher chain tension demands of the lower gears. The carbon-reinforced alloy carrier spider ties the whole assembly together with torsional stiffness that translates pedalling input directly into forward motion.

Compatibility & Fit

The CS-R9100 is an 11-speed cassette requiring a standard Shimano/SRAM HG 11-speed-compatible freehub body. It pairs directly with the Shimano Dura-Ace R9100 and Ultegra R8000 groupsets, and is also compatible with other Shimano 11-speed road drivetrain components. Use with a Shimano HG-EV 11-speed or HG-X11 chain. Not compatible with 10-speed or 12-speed drivetrains.