8-9 watts at 40 kph seems high but certainly would help explain why so many pros at the elite level don't ride disks considering some of their positive attributes.


Sure didn't slow Kittel's dominance in the sprint in the Tour de France before he dropped out. On his disk brake Venge VIAS he literally sprinted away from the competition and that was at 70 kph not 40 kph where watt penalty would be much higher. I question the veracity of that value but of course its possible I suppose.