The Ultegra BR-R8010-RS are designed to be used with frames that require a direct mount front caliper. This aerodynamic set-up is easy to set up and service. Shimano improved overall power and modulation by reshaping the aluminum caliper with focused augmentation to provide greater stiffness and more consistent braking under heavy power. This may be noticeable more to heavier riders, or those who tend to brake as late as is feasible. It will take a truly sensitive rider to feel improvement in feel, as the 8010 series direct mount brakes were highly impressive in this regard, but most will notice subtleties when paired with Dura-Ace or Ultegra series levers, as the ergonomics and leverage in the STI do feel different, despite the carry over of the cable pull ratio.