You’ll no longer have the frustration of not being able to find the perfect gear, because this cassette goes to 11. “Why?” Because it’s one better than 10. The new Dura-Ace 9000 11-speed cassettes feature a carbon mid-spider for lighter weight and titanium cogs (16t and larger), meaning they’re lighter, stronger, and made of some of the same stuff as the Mars Curiosity Rover. SCIENCE! The cassettes are available in a range of sizes, including a wide-range 11-28 option – one cassette to use all year round. Smooth, fast shifting guaranteed.
Carbon mid spider carrier
Titanium sprockets (16T and bigger)
11-speed, Rider-tuned gear combinations 11-23T/11-25T/11-28T/12-25T/12-28T