Shimano dura ace 9000 road front hub elite road racers demand the best dura ace components are precision engineered for ultimate performance and durability the dura ace 9000 road front hub features an oversized alloy axle for increased rigidity features oversized axle has increased rigidity both torsionally and laterally removing axle flex when under compression from the quick release thus improving rotational smoothness and durability labyrinth double contact sealing low friction seals e