Great speed means great responsibility. That's why, faced with the task of making the new ULTEGRA groupset even faster,
Shimano decided to take a holistic and 100% performance-focused approach. Shimano's new 12-speed road groupset delivers unparalleled control and comfort anytime, anywhere - whether you're competing in an amateur race, chasing your personal best, or out for a social ride. That is "Science of Speed". And it's what sets SHIMANO apart from the rest.
The smooth shifting of the ULTEGRA R8100 12-speed cassettes lets you climb, sprint or roll along without having to think about the next change of speed. Larger teeth maximise drive efficiency and are at the same time compatible with existing 11-speed freewheels. The cassette is available in two versions: 11-30T and 11-34T.
Features
- Hyperglide+ faster shifting, improved speed, shifting efficiency and smoothness on any terrain
- Refined 12 step gear combination provides peak efficiency and accelerating performance for every racing situation
- Faster, smoother shifts under maximum pedalling force
- Compatible with HG Spline L2 Road 12-speed and HG Spline L Road 12/11-speed FREEHUB Body
Spec
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Use: Road / Gravel
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Group: Ultegra R8100 / GRX RX820
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Model: CS-R8101-12
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Type: HG Spline L2 Road 12-speed / HG Spline L Road 12/11-speed FREEHUB Body
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Gear: 12-speed
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Compatible chain: CN-M8100 HG 12-speed
Ratio
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11-30 (11-12-13-14-15-16-17-19-21-24-27-30 teeth)
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11-34 (11-12-13-14-15-17-19-21-24-27-30-34 teeth)
Material
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Spider arm: Aluminium
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Spockets: Steel
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Lock ring: Aluminium
Weight
- 291g (11-30)
- 345g (11-34)
Contents
- 1 x Shimano ULTEGRA CS-R8101 12-speed Cassette incl. Lock Ring
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.
Weights are based off pre-production products at time of publication. Weights may vary in final production.
