All I know is I am amazed at bicycle racers. I average 12 on my commuter (Trek 520) and 14-15 on my road bike (Trek Madone)while just fun riding. Rarely do I all out push myself at my age. So when I see these racers average 30 mph or more, it amazes me. I can't imagine averaging 30 mph over a 5 or 6 hour time span.