Shimano Ultegra 12v 11-30 CS-R8100 Ultegra Cassette.

HYPERGLIDE+ cassettes revolutionized off-road shifting with their fluid shifts, both upshifting and downshifting. Now is the time for technology to change road cycling. Even during maximum efforts on a climb or competing with friends, riders no longer need to back off to make a shift. In any gear, ULTEGRA R8150 drivetrains maximize efficiency thanks to larger sprockets and maintain compatibility with existing HYPERGLIDE rear hub bodies. All this increasing to 12 gears, the ULTEGRA CS-R8100 cassettes are the new paradigm in road shifting.

Characteristics:

• The refined 12-step gear combination provides maximum efficiency and acceleration performance for every racing situation.
• Faster, smoother shifting with maximum pedaling force.
• Compatible with the new 12-speed and 11-speed road REAR HUB body.