Ultegra 12-speed cassette
Shimano Ultegra CS-R8101-12 12-Speed Cassette
The current Ultegra 12-speed cassette, revised so it works with both Di2 and mechanical 12-speed Shimano road groups. It suits Ultegra, 105 and GRX 2x drivetrains in a close 11-30T or a climbing-friendly 11-34T.
Highlights
Why we rate it
Works with mechanical and Di2
The R8101 revision replaces the original CS-R8100 and is specified for both electronic and cable-operated 12-speed Shimano road groups.
Hyperglide+ shifting
Shift ramps and tooth profiles guide the chain across sprockets cleanly, cutting shift time noticeably compared with older Hyperglide.
Sensible weight saving
Steel sprockets sit on two aluminium carriers, keeping weight down without the cost of titanium.
Road and gravel ranges
11-30T for tight road spacing, or 11-34T for big climbs and 2x gravel setups.
Wide wheel compatibility
Fits Shimano 12-speed road and conventional 11-speed road freehub bodies.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- CS-R8101-12
- Speeds
- 12
- Ratios
- 11-30T, 11-34T
- 11-30T sprockets
- 11-12-13-14-15-16-17-19-21-24-27-30
- 11-34T sprockets
- 11-12-13-14-15-17-19-21-24-27-30-34
- Weight
- 291g (11-30T), 345g (11-34T)
- Materials
- Steel sprockets, two aluminium carriers, aluminium lockring
- Freehub
- Shimano HG road 12-speed (HG L2) and road 11-speed
- Compatible derailleurs
- RD-R9250, RD-R8150, RD-R7150, RD-R7100 (11-34T), RD-RX820
- Chain
- Shimano 12-speed HG+ (CN-M8100 recommended)
- Replaces
- CS-R8100-12
In the box
- Includes
- Cassette
- Includes
- Lockring
Ordering
Available from The Cycle Collective
Available to order through The Cycle Collective in Dorking. For availability, setup or advice, call 0203 148 6764 or email hello@thecyclecollective.cc.