also, carbon bars are a bad bad bad idea on the track. the last thing you want is something snapping at speed on one of those. also, their crashes are spectacular...

that said, i'm about 200# right now, and i have the fsa carbon bars on my ride. i don't notice any flex on the bar at all. the crank, however, is another story. that thing has quite a bit of flex on it. i didn't really notice it until i got my track bike with steel crank arms... now i can't help but notice