I remember reading an article about Tom Boonen quite awhile ago where it said that he went from carbon crank arms back to the alloy ones because he was having trouble winning races. I don't know if it was just a rumor or what, but it got me wondering if I shouldn't trade out the ole carbons for the alloys, especially on the flat courses. Does anybody have any insight to this? I'm sure there is more flex in the carbons, but does that amount to wasted energy? If so, is it enough to worry about? Thank you.