The Shimano Dura-Ace 7900 10 Spd Double Chainset offers the optimum balance of light weight and rigidity, making it the global choice for road racing’s elite riders. These industry leading HollowTech II cold forged hollow crank arms have been evolved to increase rigidity, reduce weight, and improve strength. HollowTech II 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 including bottom bracket 725 grams. There is a wide range of chainring ratios and crank arm lengths available enabling customisation for all riders and racing disciplines.