The fast forward f6r 60mm carbon tubular shimano 11 speed wheelset is an aerodynamic wheelset for the racer with a 60mm darc profile rim this is the most chosen set for competition riders or the serious enthusiasts the rim has a double arc darc rim profile that compresses the air onto the rim to create a faster airflow which reduces the drag behind the wheel these fast forward wheels are built in the netherlands onto ffwd hubs with dt aerolite spokes and dt pro lock brass nipples the ffwd