The 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
 
Features.
 
HYPERGLIDE+ cassettes revolutionized off-road shifting with its seamless shifts both up and down the gear range.
Refined 12 step gear combination provides peak efficiency and accelerating performance for every racing situation
Faster, smoother shifts under maximum pedaling force
Compatible with new 12-speed and road 11-speed FREEHUB body