This guy majored in material science. He's got his Bachelors and a PhD in Material science. It is a well known FACT that aluminum doesn't hold up as long as carbon. Oh and by the way. I bet you Lance rides a much more wrapped bottom bracket than a regular 8. I bet you he rides 10 wich is about the same as aluminum. I have seen charts on Carbon, Titanium, Steel and Aluminum at the University of Miami's Science Department where my LBS guy got his bachelors and PhD. I was just putting in my 2 cents. If they don't make sense to you fine then just don't say anything. If it doesn't make sense then close your mouth. I don't need a lecture or to be badgered about my OPINION.