"Shimano Ultegra HYPERGLIDE+ (CS-R8100-12).
HYyperglide cassettes have revolutionized off-road shifting with its seamless shifts both up and down the gear range. Now it's time for the technology to change road cycling. Even during maximal efforts up a climb or racing a friend, riders no longer need to back off to perform a shift. In any gear, Shimano ULTEGRA R8150 drivetrains maximize efficiency thanks to larger cogs and retain compatibility with existing HYPERGLIDE FREEHUB bodies. All this while increasing to 12-gears, ULTEGRA CS-R8100 cassettes are the new paradigm in road shifting.
 
Available in 11-30t and 11-34t gearing
11-12-13-14-15-16-17-19-21-24-27-30t gears, weight: 291 g
11-12-13-14-15-17-19-21-24-27-30-34t gears, weight: 345 g"
 
- Shimano