That's an old video. The reason the bike broke was because it was a specially made bike for the attempt. It was really light and because of that the frame's structure was pretty much flawed. He still got the record because just on his test run with a normal mountain bike, he shattered the old record.
Hahah that is crazy i have seen that on real t.v before he beat the world record the first time down and he wanted to go even faster the second time and as you saw it didnt work out.
u cant go faster than your terminal velocity without a propulstion device besides gravity because then in wouldnt be your terminal velocity now would it
haha, ive heard of this vid...the bike was made of super-light materials and was supposed to be the fastest bike in the world...but the speeds were so great that it ripped off the front half of the bike...damn thats ownage