The Shimano Ultegra CS-R8101 is a 12-speed road cassette with an 11-30T range.

• 12-speed, 11-30T: 11-12-13-14-15-16-17-19-21-24-27-30
• Hyperglide+ for fast, smooth shifts even under load
• Works with Shimano 12-speed Di2 and mechanical road groupsets
• Fits standard Shimano road 11-speed freehub bodies (HG L / HG L2)
• Use with a Shimano 12-speed HG+ chain