The Shimano Dura-Ace R9200 Hollowtech II Crankset is Shimano's latest and most innovative crankset to date. It offers the same precise and quick shifting performance you’ve grown to expect from Shimano Dura-Ace, although the operation is now smoother, quieter and quicker than ever before. With Shimano's updated HollowGlide structure, the Dura-Ace R9200 crankset features a lighter build weight, better power transfer and a more efficient tooth design than any previous crankset constructed by Shimano! The Shimano Dura-Ace R9200 Hollowtech II Crankset is the pinnacle of Shimano's Research and Development offering the most efficient drivetrain to date. So if you're serious about racing and looking for improvements that make a significant difference to your performance, then the all-new Shimano Dura-Ace Di2 drivetrain is the only logical solution. This range-topping drivetrain can be the difference between first and second; whether you're claiming the polka dot jersey or a stage win, you need to have the best behind you!