The HYPERGLIDE+ cassettes have revolutionized the off-road gearbox with perfect shifting and climbing fluidity. It's time for technological changes for road cycling. Even during maximum efforts uphill or near the finish line, runners no longer need to reduce the pressure on the pedals to switch gears. In any gear, the DURA-ACE R9250 drives maximize efficiency with larger sprockets and maintain compatibility with existing 11-speed rear hub bodies. All this with 12 gears and without increasing weight, the DURA-ACE CS-R9200 cassettes are the new frontier for road bikes.