83kph/51.8mph on a downhill with two slight curves, braver men than me could go faster.
There is another hill that I have hit 80kph, I know someone that has reached 96kph on this hill but you need balls of solid steel, as the bottom is very bumpy (no road maintenance) and a blind right corner.
I usually hit 70kph/43mph on my way to work.
CHEERS.
Mark