Shimano Dura-Ace R9200 12 Spd Road Cassette With 11-30 and 11-34 Shimano Dura-Ace CS-R9200 12-Speed Cassette options, Dura-Ace riders now have even lower climbing gears. No matter your riding level, you can experience the best road performance available. Despite even wider gear ranges, smooth, consistent gear steps remain a Shimano hallmark thanks to the addition of the 12th cog. Keeping things simple, the R9200 rear derailleur is offered with a single cage length that is compatible with the entire range of R9200 cassettes. The Dura-Ace 12-Speed Cassette is compatible with Shimano 11-speed freehub bodies or the new Shimano 12-speed freehub body. HYPERGLIDE+ cassettes have revolutionized off-road shifting with their seamless shifts both up and down the gear range. Shimano translated that te