Shimano Dura-Ace CS-R9200 Cassette

HYPERGLIDE+ cassettes offer a revolutionary off-road shifting system with seamless shifting to both extremes of hot range. Now it's time for the technology to change road cycling too. Even at maximum effort on a climb or shortly before the meet, you don't have to slow down to shift gears. DURA-ACE R9250 drivetrains offer maximum efficiency in every gear thanks to larger sprockets and are still compatible with existing 11-speed freewheel hubs. Moreover, DURA-ACE CS-R9200 cassettes now have 12 gears and weigh less, a new benchmark for shifting on the road.