Shimano Dura-Ace 12 Speed Double Chainset Racks The innovative AutoHead™ automatically swiches

The innovative AutoHead™ automatically swiches between Presta and Schrader valve tyres

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

Handlebar : Lo-Rise MTB handlebars

• Adjustable nose and arm pieces

CNC machined 7075 T6 aluminium

Shimano Dura-Ace 12 Speed Double Chainset Racks The innovative AutoHead™ automatically swichesDescription 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