As Galileo proved a long time ago, the mass of an object does not affect how fast gravity pulls it down-->they're all still accelerated at 9.8m/s/s. The only thing would be the frontal surface area, affecting the drag.

I later read in the thread that this has been hashed a million times already... I too go much faster downhill than the rest of my family. Just coasting I pass them like they were standing still and no they are not on the brakes. I don't like going super fast... I can't help but thinking "what if I crash"
D