Shimano DURA-ACE CS-R9200 12 Speed CassetteThe uninterrupted shifting experience of the DURA ACE R9200 12 speed cassette range lets you climb, sprint, and push your limits 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 have revolutionized off road shifting with their seamless shifts both up and down the gear range. Now it's time for the