The shimano dura ace 9000 compact chainset sets new standards for stiffness and weight in the road racing discipline featuring a hollowtech ii construction in a 4 arm design the shimano chainset does everything in tis power to boost stiffness while keeping weight to an absolute minimum the addition of hollowglide chainrings means that shifting with the shimano dura ace 9000 crankset is an absolute dream achieving flawlessly smooth shifts whilst also keeping up with the design by red