Shimano Ultegra CS-R8101 12-Speed Cassette | 11-30T | HG L2 Freehub
Shimano Ultegra CS-R8101 12-Speed Cassette | 11-30T
Professional-level road shifting for racers, climbers, and endurance riders.
The Shimano Ultegra CS-R8101 cassette delivers the fast, crisp shifting and refined performance expected from Shimano's renowned Ultegra R8100 groupset. Designed for both Di2 electronic and mechanical 12-speed drivetrains, the CS-R8101 provides smooth gear changes, lightweight construction, and exceptional durability for every ride.
The 11-30T gear range offers tightly spaced gearing for maintaining an efficient cadence while still providing a climbing gear capable of handling steep ascents. It's an excellent choice for performance road riding, gran fondos, fast group rides, and competitive racing.
Built using Shimano's advanced sprocket design and premium materials, the CS-R8101 delivers quick, accurate shifting while minimizing drivetrain noise and wear. The cassette mounts to Shimano's 12-speed HG L2 road freehub, which remains backward compatible with most standard Shimano 11-speed HG road freehub bodies.
Key Features
- Genuine Shimano Ultegra 12-speed cassette
- Optimized for both Di2 and mechanical shifting systems
- Close-ratio 11-30T gearing for efficient cadence control
- Smooth and precise Hyperglide shifting performance
- Lightweight, race-ready construction
- Compatible with Shimano 12-speed road drivetrains
- Excellent for racing, endurance riding, and fast group rides
Gear Range
- 11T
- 12T
- 13T
- 14T
- 15T
- 16T
- 17T
- 19T
- 21T
- 24T
- 27T
- 30T
Technical Specifications
- Brand: Shimano
- Series: Ultegra
- Model: CS-R8101
- Generation: Ultegra R8100
- Speeds: 12-Speed
- Gear Range: 11-30T
- Compatible Chain: Shimano HG 12-Speed
- Compatible Drivetrains: Shimano Di2 & Mechanical 12-Speed Road
- Freehub Compatibility: Shimano HG L2 / Shimano 11-Speed Road HG Freehub
- Cassette Type: Cassette
- Shimano Product Code: ICSR810112130
- UPC: 192790849898
Why You'll Love It
- Fast, quiet, and exceptionally precise shifting
- Ideal gearing for rolling terrain and mountain climbs
- Close gear spacing helps maintain an efficient cadence
- Compatible with both Di2 and mechanical Ultegra groupsets
- Premium Shimano reliability for thousands of miles
Compatibility
- Shimano Ultegra R8100 12-speed
- Shimano Dura-Ace R9200 12-speed
- Shimano 105 R7100 12-speed
- Shimano HG 12-speed chains
- Shimano HG L2 / 11-speed road HG freehub bodies
Before You Buy
- This cassette is designed for Shimano 12-speed road drivetrains.
- Compatible with both Di2 electronic and mechanical shifting systems.
- Fits Shimano HG L2 road freehub bodies and is backward compatible with most Shimano 11-speed road HG freehub bodies.
- For best shifting performance, pair with a Shimano HG 12-speed chain.
The Shimano Ultegra CS-R8101 11-30T Cassette offers the perfect balance of lightweight performance, precise shifting, and versatile gearing, making it an outstanding choice for riders who demand race-level performance without compromise.