Shimano Cassette, CS-R8101, Ultegra, 12-Speed flat pedals The integrated X-Comfort zone technology

The integrated X-Comfort zone technology prevents numbness by extending the shoe's edges if needed

quick-release

aerodynamics and a better fit

performance

Fixed type

Shimano Cassette, CS-R8101, Ultegra, 12-Speed flat pedals The integrated X-Comfort zone technologyThe uninterrupted shifting experience of the ULTEGRA R8100 12 speed cassette range lets you climb, sprint, or cruise without stopping to think about your next gear change. Larger driving cogs maximize drivetrain efficiency and create compatibility with both Shimano 11 and 12 speed FREEHUB bodies. HYPERGLIDE+ cassettes revolutionized off road shifting with its seamless shifts both up and down the gear range. Now it's time for the technology to change