Shimano CS-R8101 Cassette 11-30 ULTEGRA 12-speed Size:11-30T on the inside

on the inside

Tube rotates while magnet stays in place

Fat tires need fat tubes

The industry's original and most versatile dry-style bicycle lubricant is now formulated with high performing nano-ceramic boron nitride

The liner is removable

Shimano CS-R8101 Cassette 11-30 ULTEGRA 12-speed Size:11-30T on the insideThe 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