Shimano Dura-Ace 12 Speed Double Chainset Racks even under the most demanding

even under the most demanding gear changes

frame-integrated hydration and storage help keep you fueled

The fi'zi:k Argo Adaptive R3 with K:ium alloy rails is available in 140mm (224g) and 150mm (230g)

• Adjustable nose and arm pieces

Snap System™

Shimano Dura-Ace 12 Speed Double Chainset Racks even under the most demandingDescription The HollowTech II 12 speed Dura Ace chainset offers the optimum balance of light weight and rigidity, making it the global choice for road racing's elite riders Hollow outer chainring, giving vast improvements in rigidity and increased weight savings The hollow outer chainring has essentially removed outer chainring flex, hugely improving shift performance making it precise even under high load These industry leading HollowTech II 4 arm