Totally anecdotal, and I am an old orangutan on an old mtb, but I experimented with wind resistance, highest cadence, and max speed on my steepest hill. Whether I pedal to 25mph and "tuck", or pedal like mad all the way down, I still top out at 35-36 mph. Hundreds of trials. Again, totally unscientific, and no superman! 40x11 chain ring/sprocket.