Shimano Dura-Ace FC-R9200 Crankset The heart of the bike Shimano's top tier crankset has seen a complete makeover with the jump to 12-speed. The latest Dura-Ace R9200 crankset has been designed from the ground up to be the ultimate blend of stiffness, strength, weight, and rotational performance. The unique Hollowglide chainring structure chops off weight while simultaneously improving the crank strength for improved power transfer and more precise shifting. Hollowtech II technology has been utilized in the crank arms to shave off weight for decreased rotational mass and increase the rigidity for improved acceleration. All of this weight savings thanks to Hollowglide and Hollowtech II has resulted in the complete crankset weighing in at 685g. This year we see the introduction of a 54-40t chainring setup, which is perfect for crit racers, wattage bomb droppers, and those who tend to ride on flatter terrain. So whether you're looking to build up the ultimate road rocket, upgrade to the latest and greatest Dura-Ace groupset, or are just looking to upgrade the existing crankset on your bike, Shimano's Dura-Ace R9200 crankset should be at the top of your list. Features Hollowtech II shaves weight off the crank arm Hollowglide chainring improves shifting while saving weight and increasing stiffness54-40t chainring option for anyone looking for the fastest gearing Truly optimized design ensures no watts are wasted Only compatible with Shimano 12-speed road components SPECIFICATIONSSpeeds12BB Compatibility Hollowtech IIChain Ring50-34t, 52-36t, 54-40t Crank Arm Length160mm, 165mm, 167. 5mm, 170mm, 172. 5mm, 175mm, 177. 5mm BB Spindle Interface Hollowtech IIChainring Material Bolt Center Diameter (BCD)110Crank Arm Material Chainline44. 5mm Bottom Bracket Included No Intended Use Road Weight685g (50-34t), 714g (54-40t), 692g (52-36t) | Shimano | Dura-Ace Fc-R9200 Crankset 170Mm, 12-Speed, 52/36T, Hollowtech Ii Spindle Interface, Black | Aluminum