The seamless shifting of the Dura Ace R9200 12-speed cassette allows the rider to fully focus on climbs, sprints, and pushing their limits without worrying about the next gear change. Cogs with more teeth provide higher drive efficiency and ensure compatibility with Shimano 11- and 12-speed freehub bodies. Hyperglide + cassettes set new standards for shifting in off-road use thanks to smooth gear changes across the entire range. It's time for this technology to be used in road bikes as well. Even under maximum effort during climbs or sprints to the finish line, riders no longer have to hesitate to shift gears. In all gears, the Dura Ace R9250 drivetrain ensures maximum efficiency thanks to larger teeth and guarantees compatibility with existing 11-speed freehub bodies. Despite the expansion to 12 speeds without increasing weight, Dura Ace CS-R9200 cassettes set new benchmarks for road bike shifting systems. Intended use: derailleur shifting. Details: - Weight specification for the 11-30T version - Gear ratios: 11-12-13-14-15-17-19-21-24-27-30-34 - 5 steel cogs, 7 titanium cogs. Type: cassette sprocket. Number of speeds: 12. Compatibility: Shimano. Gear ratio (teeth): 11 teeth - 34 teeth.