Shimano Dura-Ace Compact Chainset - HollowTech II 177.5mm 50/34T

TheShimanoDura-Ace CompactChainset-HollowTechIIoffers the optimum balance of light weight and rigidity, making it the global choice for elite riders. ShimanoDura-Ace CompactChainset-HollowTechII Features TheHollowTechII 11-speed Dura-Acechainsetoffers the optimum balance of light weight and rigidity, making it the global choice for road racing's elite riders Hollow outerchainring, giving vast improvements in rigidity and increased weight savings The hollow outerchainringhas essentially removed outerchainringflex, hugely improving shift performance making it precise even under high load These industry leadingHollowTechII 4 arm cold forged hollow crank arms have been evolved to increase rigidity, reduce weight, and improve strength The teeth have been developed to work only in conjunction with the 11-speed chains for improved contact providing more efficiency and improved power transfer There is a wide range ofchainringratios and crank arm lengths available enablingcustomisationfor all riders and racing disciplines HollowTechII integrated bottom bracket design uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency Bottom bracket seal design has a minimal bearing interface gives superbly smooth rolling and increased durability Weight 609 grams