This was the first time I have watched a bicycle race, either in person or on TV. A couple of questions/observations from a total newbie:

1) Maybe it was just the camera angle, but it seemed as though there were many spectators running out into the course among the bikers. The last thing I would want to see while tooling along at 30 mph or better is some idiot running out in front of me.

2) I know vert little about professional bikes like that. What are they made of, what size tires do they use, and how much does a typical one weigh?