Shimano Dura Ace FC 9000 50X34 11 Speed Compact Crankset. Leave it to Shimano to find a way to make the legendary Dura Ace line up even better. The Dura Ace FC 9000 11 speed crankset is truly a stunning part of the latest Dura Ace 9000 groupset, which makes the jump to 11 speed and is lighter than ever. What you'll notice right away is the switch from a 5 arm spider to a 4 arm design which takes both stiffness and light weight to new levers. Ingeniously, this 4 arm spider also utilizes the same bolt circle diameter for both standard and compact chainrings. Gone are the days of having to purchase separate standard and compact chainring cranksets now you can simply swap out chainrings on the same spider to fine tune your gear ranges for the terrain. As always, Shimano utilizes Hollowglide technology in the chainrings as well as using the Hollowtech II integrated bottom bracket axle to perfectly balance stiffness and light weight in both areas of the crankset. The result Legendary performance with even more versatility. Bravo, Shimano.