I found this video clip from a Cyclocross event from a few years back. From what I hear, you really need to have a lot of endurance and stamina to do one of these events. Well, I have a question. In the beginning of the clip, why do so many bicyclists slip and crash in the same spot. Do the tires have anything to do with it, I mean, I would imagine so? It almost seems like they are going over a patch of black ice. Thanks because I am thinking of doing an event like this in the summer and I could use all the advice I can get. Here is the link.