Shimano CS-R8101 Cassette 11-30 ULTEGRA 12-speed Size:11-30T stays on the chain longer

stays on the chain longer and keeps the chain clean

and 9-bit kit

In one sense

comfortable fit

Two different versions for Tapered and 1 1/8" Straight steerer tubes

Shimano CS-R8101 Cassette 11-30 ULTEGRA 12-speed Size:11-30T stays on the chain longerThe 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