The Shimano Ultegra CS-R8100 is a high-performance 12-speed cassette featuring Hyperglide+ technology. This system allows for seamless shifting under maximum load, letting you maintain cadence during sprints or steep climbs. It is a significant upgrade for Di2 systems, offering faster and quieter gear changes compared to previous generations.

Designed for versatility, the cassette is compatible with both new Shimano 12-speed and existing 11-speed road freehub bodies. The 11-30T and 11-34T ranges use a mix of steel cogs and aluminum spiders to balance weight and durability. At 291g (11-30T), it provides a lightweight, racing-ready drivetrain solution for any road terrain.

Quick Facts

Feature	Specification
Speeds	12-Speed
Technology	Hyperglide+ (Shifting under load)
Freehub Compatibility	Shimano HG 11 & 12-Speed Road
Weight	291g (11-30T) / 345g (11-34T)
Materials	Steel Cogs / Aluminum Spiders
Chain Compatibility	HG 12-Speed (e.g., CN-M8100)