Shimano Dura-Ace CS-R9200 Cassette - 12-Speed 11-34t GrayShimano Dura Ace CS R9200 Cassette 12 Speed 11 34t Gray. The uninterrupted shifting experience of the Shimano 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. Shimano HYPERGLIDE+ technology is integrated to provide seamless shifts both up