Shimano dura ace 7950 compact 10sp chainsetthis aerodynamically designed crankset combines new engineering features together with remarkable weight saving high rigidity for optimal power transfer the hollowtech ii 10 speed dura ace chainset offers the optimum balance of light weight and rigidity making it the global choice for road racings elite ridersplease note bottom bracket is not included featuresshimano has raised the bar to a new level ofperformance with the development of a hollow o