Watching the Tour de France, the commentators talk about Rasmussen not being a good time trialist. Leipenheimer is a pretty small guy, too, but he does much better. Cancellara is not a real big guy, either. What makes a person good at time trials? Is it VO2, riding position, or some other quality? I get climbing, I get sprinting, but time trial ability escapes me. I have never raced bicycles other than triathlons, so thanks for your forbearance.