Please endure a question from a road biker switching to mtb. I see many mtbrs with frames that look somewhat too small, but with the seats extended to almost their maximum range. I also see that many downhill crashes are over the bars type crashes. My question is: does not the high seat height relative to frame size raise the center of gravity of the rider to a point where he is begging to be thrown over? Asking the same question differently: would a rider on a larger framed bike with the seat height somewhat lower be less likely to be thrown over the bars? It would seem that the same pedal thrust could be accomplished in either case. Your expertise is appreciated.