The Dura-Ace FC-R9200 crank offers two indispensable functions: transferring pedal power into drive energy and ensuring extremely fast and precise front shifting. With lightweight Hollowtech II crank arms and Shimano's superior chainrings, the FC-R9200 crankset guarantees reliable function and performance. The FC-R9200 is offered with crank arms in different lengths to provide a suitable option for every riding style. Lightweight cranks reduce the overall weight of the bike and especially the rotating mass that is crucial for acceleration. The challenge is to reduce the weight of the crank without compromising stability and load capacity. Shimano state-of-the-art forging technology offers an ideal solution with the Hollowtech crank. Just like a high-quality frame tube, the hollow-arm crank is enormously stable and resilient at very low weight. In addition to the advantages of Hollowtech technology, in the Hollowtech II crankset the right crank is firmly connected to the axle of the bottom bracket, achieving an optimal balance between maximum stiffness and minimum weight. The outboard bottom bracket offers better weight distribution and more stability, which ensures more efficient power transmission. When developing the Hollowtech II crankset, emphasis was placed on achieving an optimal balance between stiffness and rotational efficiency as well as low weight and an attractive appearance. The Hollowtech II crankset also features high-quality precision seals in the bearing area to extend durability and maintain the excellent rotational efficiency in the long term.