Shimano Ultegra CS-R8101 12-Speed Cassette

The Shimano Ultegra CS-R8101-12 is a 12-speed cassette developed to deliver extremely smooth, fast and efficient shifting for modern Shimano road drivetrains.

Thanks to HYPERGLIDE+ technology, shifting remains fast and stable even under maximum pedaling load, improving drivetrain efficiency during climbs, sprints and accelerations.

The cassette is designed for Shimano Ultegra R8100 12-speed systems while maintaining compatibility with traditional Shimano HG 11-speed road freehub bodies. 

Key features

• Shimano Ultegra 12-speed cassette
• HYPERGLIDE+ technology
• Faster and smoother shifting under load
• Compatible with Shimano HG 11-speed road freehubs
• Optimized gear progression for road riding
• Compatible with Shimano 12-speed road drivetrains
• Ideal for racing, endurance and training

HYPERGLIDE+ technology

HYPERGLIDE+ technology enables smoother and faster shifting both up and down the cassette, reducing drivetrain interruption and improving pedaling consistency.

Shimano optimized tooth profiles and shift ramps to ensure fluid gear transitions even during hard efforts. 

Compatibility

• Shimano 12-speed road drivetrains
• Ultegra R8100 groupsets
• Shimano 105 R7100 12-speed
• Dura-Ace R9200 12-speed
• Shimano HG 11-speed road freehub bodies

Available gear ranges

• 11-30T
• 11-34T

The 11-30T version provides tighter gear spacing for performance riding, while the 11-34T offers increased climbing versatility and endurance comfort.

Technical specifications

• Brand: Shimano
• Series: Ultegra R8100
• Model: CS-R8101-12
• Speeds: 12-speed
• Technology: HYPERGLIDE+
• Compatibility: Shimano Road 12-speed
• Freehub: Shimano HG 11-speed road
• Use: Road / Endurance / Race

Why choose it

• Extremely smooth shifting
• High performance under load
• Compatible with many existing Shimano hubs
• Perfect for modern 12-speed road bikes
• Excellent balance of weight, durability and performance