Originally Posted by Route 66

When I first got it, it thought that there was a certain amount of drag vs. my previous bike (Cannondale Quick carbon 1). When I got back from that ride I put it on my stand and noticed that the brakes were rubbing. I centered the the discs around the rotors so that the wheels spun freely and took it out again. This time I didn't notice any drag at all. In terms of absolute efficiency, I don't know if a belt drive can match a conventional drivetrain yet or we'd be seeing the pros using them.