An aerodynamic wheel set for the racer with a 60mm darc profile rim this is the most chosen set for competition riders or the serious enthusiasts strong stiff yet lightweight in its category of carbon wheels ffwd darc darc stands for double arc which is the profile of the rim it compresses air on the rim to create a faster airflow which reduces the drag behind the wheel improved ffwd hub set ffwd wheels is constantly looking for improvements to offer better quality by searching for