Hope you slept well. I'm curious what you're trying to accomplish is this thread. Since the OP is talking about downhill bicycling speed where clearly air resistance is a major limiting factor, does repeating some abstract and incomplete statement like "the speed of falling objects is independent of their weight [in a vaccuum]" contribute in any way to the answer to the question? You're a fairly new poster with some helpful contributions in other threads, and not a smart alec teenager - what got you into such a feisty, oppositional mood in this thread?