Shimano Ultegra CS-R8100 Cassette

The Shimano Ultegra CS-R8100 cassette is the optimized core of any 12-speed Ultegra drivetrain, designed to elevate road bike performance. This cassette introduces Shimano's revolutionary Hyperglide+ system, which ensures smooth shifting both up and down, even under extreme load. The result is a significant reduction in shift time and a more stable cadence, crucial for races and gran fondos.

What sets the CS-R8100 apart is its construction focused on lightweight and stiffness. The larger sprockets are mounted on an aluminum spider to minimize weight where it counts. This increases stiffness and reduces inertia for faster acceleration. The cassette uses two aluminum sprockets and durable steel for the remaining cogs, ensuring excellent durability without compromising performance.

The Ultegra 12-speed cassette is available in optimized gear ratios such as 11-30T and 11-34T. The 11-34T variant offers a wide range that is ideal for steep climbs without switching to an MTB component. Although the design has 12 gears, the CS-R8100 fits the traditional Shimano HG freehub body (with specific sprocket placement). For the best shifting performance, combining it with the CN-M8100 or CN-M9100 12-speed chain is recommended.